diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index b424d59c..70382047 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -1,4 +1,13 @@
 version: 2
+# Deliberately throttled to avoid a PR flood. Two knobs do the work:
+#   - open-pull-requests-limit: 1  -> at most ONE open PR per ecosystem at a
+#     time. Dependabot will not open next week's PR until the current one is
+#     merged or closed, so PRs can never pile up.
+#   - groups (patterns: "*")       -> every available bump (major/minor/patch)
+#     is batched into that single PR instead of one PR per package.
+# Combined with the weekly schedule this means: normally one npm PR a week (or
+# none), and only in a rare week where Docker/Actions also move do you see more
+# than one PR at all.
 updates:
   # Base images in the root Dockerfile (node:22-alpine).
   - package-ecosystem: docker
@@ -6,7 +15,11 @@ updates:
     schedule:
       interval: weekly
       day: monday
-    open-pull-requests-limit: 5
+    open-pull-requests-limit: 1
+    groups:
+      docker:
+        patterns:
+          - "*"
     labels:
       - dependencies
       - docker
@@ -17,7 +30,11 @@ updates:
     schedule:
       interval: weekly
       day: monday
-    open-pull-requests-limit: 5
+    open-pull-requests-limit: 1
+    groups:
+      docker-cron:
+        patterns:
+          - "*"
     labels:
       - dependencies
       - docker
@@ -28,7 +45,11 @@ updates:
     schedule:
       interval: weekly
       day: monday
-    open-pull-requests-limit: 5
+    open-pull-requests-limit: 1
+    groups:
+      github-actions:
+        patterns:
+          - "*"
     labels:
       - dependencies
       - ci
@@ -39,16 +60,15 @@ updates:
     schedule:
       interval: weekly
       day: monday
-    open-pull-requests-limit: 10
+    open-pull-requests-limit: 1
     labels:
       - dependencies
       - npm
     groups:
-      # Batch low-risk minor/patch bumps so the reviewer queue stays small.
-      minor-and-patch:
-        update-types:
-          - minor
-          - patch
+      # Batch ALL bumps (major/minor/patch) into a single weekly PR.
+      npm:
+        patterns:
+          - "*"
     ignore:
       # @anthropic-ai/bedrock-sdk is PINNED to an exact version in package.json.
       # 0.32.0 arrived inside a grouped minor-and-patch bump (#884) and broke
diff --git a/app/api/bookkeeping/accounts/__tests__/accounts.test.ts b/app/api/bookkeeping/accounts/__tests__/accounts.test.ts
index 9e8117fc..80255d72 100644
--- a/app/api/bookkeeping/accounts/__tests__/accounts.test.ts
+++ b/app/api/bookkeeping/accounts/__tests__/accounts.test.ts
@@ -131,6 +131,29 @@ describe('POST /api/bookkeeping/accounts', () => {
     expect(status).toBe(409)
     expect(body.error).toContain('5010')
   })
+
+  it('forwards default_vat_rate into the insert', async () => {
+    const { supabase, calls } = createCapturingSupabase([
+      { data: { account_number: '3740', default_vat_rate: 0 } },
+    ])
+    auth(supabase)
+    const req = createMockRequest('/api/bookkeeping/accounts', {
+      method: 'POST',
+      body: {
+        account_number: '3740',
+        account_name: 'Öres- och kronutjämning',
+        account_type: 'revenue',
+        normal_balance: 'debit',
+        default_vat_rate: 0,
+      },
+    })
+    const { status } = await parseJsonResponse(await createPOST(req, routeParams))
+    expect(status).toBe(200)
+    const insertArg = calls.find((c) => c.method === 'insert')?.args[0] as {
+      default_vat_rate?: number | null
+    }
+    expect(insertArg?.default_vat_rate).toBe(0)
+  })
 })
 
 describe('DELETE /api/bookkeeping/accounts/[number]', () => {
@@ -218,6 +241,25 @@ describe('PUT /api/bookkeeping/accounts/[number]', () => {
     expect(status).toBe(200)
     expect(body.data.account_name).toBe('Nytt namn')
   })
+
+  it('forwards default_vat_rate into the update', async () => {
+    const { supabase, calls } = createCapturingSupabase([
+      { data: { account_number: '3740', default_vat_rate: 0 } },
+    ])
+    auth(supabase)
+    const req = createMockRequest('/api/bookkeeping/accounts/3740', {
+      method: 'PUT',
+      body: { default_vat_rate: 0 },
+    })
+    const { status } = await parseJsonResponse(
+      await PUT(req, { params: Promise.resolve({ number: '3740' }) })
+    )
+    expect(status).toBe(200)
+    const updateArg = calls.find((c) => c.method === 'update')?.args[0] as {
+      default_vat_rate?: number | null
+    }
+    expect(updateArg?.default_vat_rate).toBe(0)
+  })
 })
 
 describe('POST /api/bookkeeping/accounts/activate', () => {
diff --git a/app/api/bookkeeping/accounts/route.ts b/app/api/bookkeeping/accounts/route.ts
index a50ca43c..d51671bb 100644
--- a/app/api/bookkeeping/accounts/route.ts
+++ b/app/api/bookkeeping/accounts/route.ts
@@ -79,6 +79,7 @@ export const POST = withRouteContext(
         is_system_account: false,
         description: body.description || null,
         default_vat_code: body.default_vat_code || null,
+        default_vat_rate: body.default_vat_rate ?? null,
         sru_code: body.sru_code || null,
         sort_order: parseInt(body.account_number),
       })
diff --git a/components/bookkeeping/AddAccountDialog.tsx b/components/bookkeeping/AddAccountDialog.tsx
index d40c89ff..ff42e280 100644
--- a/components/bookkeeping/AddAccountDialog.tsx
+++ b/components/bookkeeping/AddAccountDialog.tsx
@@ -37,7 +37,9 @@ export function AddAccountDialog({
   const [accountNumber, setAccountNumber] = useState('')
   const [accountName, setAccountName] = useState('')
   const [description, setDescription] = useState('')
-  const [defaultVatCode, setDefaultVatCode] = useState('')
+  // "Standard moms": the moms-sats a booking line defaults to when this konto is
+  // picked. 'none' = no default. SelectItem values are stringified decimals.
+  const [defaultVatRate, setDefaultVatRate] = useState('none')
   const [sruCode, setSruCode] = useState('')
   const [normalBalance, setNormalBalance] = useState<'debit' | 'credit'>('debit')
   const [isSaving, setIsSaving] = useState(false)
@@ -84,7 +86,7 @@ export function AddAccountDialog({
           account_type: derived?.account_type || 'expense',
           normal_balance: normalBalance,
           description: description || null,
-          default_vat_code: defaultVatCode || null,
+          default_vat_rate: defaultVatRate === 'none' ? null : parseFloat(defaultVatRate),
           sru_code: sruCode || null,
         }),
       })
@@ -100,7 +102,7 @@ export function AddAccountDialog({
       setAccountNumber('')
       setAccountName('')
       setDescription('')
-      setDefaultVatCode('')
+      setDefaultVatRate('none')
       setSruCode('')
       onCreated(createdAccount)
       onOpenChange(false)
@@ -197,12 +199,19 @@ export function AddAccountDialog({
 
           <div className="grid grid-cols-2 gap-4">
             <div className="space-y-2">
-              <Label>Momskod <span className="text-muted-foreground">(valfritt)</span></Label>
-              <Input
-                value={defaultVatCode}
-                onChange={(e) => setDefaultVatCode(e.target.value)}
-                placeholder="T.ex. MP1"
-              />
+              <Label>Standard moms <span className="text-muted-foreground">(valfritt)</span></Label>
+              <Select value={defaultVatRate} onValueChange={setDefaultVatRate}>
+                <SelectTrigger>
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="none">Ingen standard</SelectItem>
+                  <SelectItem value="0">Ingen moms</SelectItem>
+                  <SelectItem value="0.25">25 %</SelectItem>
+                  <SelectItem value="0.12">12 %</SelectItem>
+                  <SelectItem value="0.06">6 %</SelectItem>
+                </SelectContent>
+              </Select>
             </div>
             <div className="space-y-2">
               <Label>SRU-kod <span className="text-muted-foreground">(valfritt)</span></Label>
diff --git a/components/bookkeeping/EditAccountDialog.tsx b/components/bookkeeping/EditAccountDialog.tsx
index 47121c3f..d1b38de2 100644
--- a/components/bookkeeping/EditAccountDialog.tsx
+++ b/components/bookkeeping/EditAccountDialog.tsx
@@ -59,7 +59,12 @@ export function EditAccountDialog({ open, onOpenChange, account, onSaved }: Edit
   const { toast } = useToast()
   const [accountName, setAccountName] = useState(account.account_name)
   const [description, setDescription] = useState(account.description || '')
-  const [defaultVatCode, setDefaultVatCode] = useState(account.default_vat_code || '')
+  // "Standard moms": the moms-sats a booking line defaults to when this konto is
+  // picked (currently the leverantörsfaktura-rad). 'none' = no default. Stored
+  // as a decimal fraction; SelectItem values are the stringified decimals.
+  const [defaultVatRate, setDefaultVatRate] = useState(
+    account.default_vat_rate != null ? String(account.default_vat_rate) : 'none',
+  )
   const [sruCode, setSruCode] = useState(account.sru_code || '')
   const [isActive, setIsActive] = useState(account.is_active)
   const [isSaving, setIsSaving] = useState(false)
@@ -250,7 +255,7 @@ export function EditAccountDialog({ open, onOpenChange, account, onSaved }: Edit
         body: JSON.stringify({
           account_name: accountName,
           description: description || null,
-          default_vat_code: defaultVatCode || null,
+          default_vat_rate: defaultVatRate === 'none' ? null : parseFloat(defaultVatRate),
           sru_code: sruCode || null,
           is_active: isActive,
         }),
@@ -310,12 +315,19 @@ export function EditAccountDialog({ open, onOpenChange, account, onSaved }: Edit
 
           <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
             <div className="space-y-2">
-              <Label>Standard momskod</Label>
-              <Input
-                value={defaultVatCode}
-                onChange={(e) => setDefaultVatCode(e.target.value)}
-                placeholder="T.ex. MP1"
-              />
+              <Label>Standard moms</Label>
+              <Select value={defaultVatRate} onValueChange={setDefaultVatRate}>
+                <SelectTrigger>
+                  <SelectValue />
+                </SelectTrigger>
+                <SelectContent>
+                  <SelectItem value="none">Ingen standard</SelectItem>
+                  <SelectItem value="0">Ingen moms</SelectItem>
+                  <SelectItem value="0.25">25 %</SelectItem>
+                  <SelectItem value="0.12">12 %</SelectItem>
+                  <SelectItem value="0.06">6 %</SelectItem>
+                </SelectContent>
+              </Select>
             </div>
             <div className="space-y-2">
               <Label>SRU-kod</Label>
diff --git a/components/settings/InvoiceSettingsForm.tsx b/components/settings/InvoiceSettingsForm.tsx
index 412e68ff..01b1bc1f 100644
--- a/components/settings/InvoiceSettingsForm.tsx
+++ b/components/settings/InvoiceSettingsForm.tsx
@@ -50,6 +50,22 @@ export function InvoiceSettingsForm({ settings }: InvoiceSettingsFormProps) {
         </div>
       </div>
 
+      <div className="space-y-2">
+        <Label htmlFor="next_arrival_number">{t('arrival_start_label')}</Label>
+        <div className="grid grid-cols-1 sm:grid-cols-3 gap-4">
+          <Input
+            id="next_arrival_number"
+            name="next_arrival_number"
+            type="number"
+            min="1"
+            defaultValue={settings.next_arrival_number || 1}
+          />
+        </div>
+        <p className="text-xs text-muted-foreground">
+          {t('arrival_start_help')}
+        </p>
+      </div>
+
       <div className="space-y-2">
         <Label htmlFor="invoice_default_notes">{t('default_notes_label')}</Label>
         <Textarea
diff --git a/components/settings/sections/InvoicingSettingsContent.tsx b/components/settings/sections/InvoicingSettingsContent.tsx
index c310488b..77d0d3be 100644
--- a/components/settings/sections/InvoicingSettingsContent.tsx
+++ b/components/settings/sections/InvoicingSettingsContent.tsx
@@ -45,6 +45,7 @@ export function InvoicingSettingsContent() {
       swish: normaliseSwish(formData.get('swish') as string) || null,
       invoice_prefix: (formData.get('invoice_prefix') as string) || null,
       next_invoice_number: parseInt(formData.get('next_invoice_number') as string) || 1,
+      next_arrival_number: parseInt(formData.get('next_arrival_number') as string) || 1,
       invoice_default_days: parseInt(formData.get('invoice_default_days') as string) || 30,
       invoice_default_notes: (formData.get('invoice_default_notes') as string) || null,
       default_our_reference: (formData.get('default_our_reference') as string) || null,
diff --git a/components/supplier-invoices/NewSupplierInvoiceForm.tsx b/components/supplier-invoices/NewSupplierInvoiceForm.tsx
index 47cd91d3..c5fda84c 100644
--- a/components/supplier-invoices/NewSupplierInvoiceForm.tsx
+++ b/components/supplier-invoices/NewSupplierInvoiceForm.tsx
@@ -697,6 +697,18 @@ export default function NewSupplierInvoiceForm({
       const desc = getAccountDescription(accountNumber)
       if (desc) setValue(`items.${index}.description`, desc.name)
     }
+    // Auto-fill the rad's moms from the konto's configured default (e.g.
+    // öresavrundning 3740 = ingen moms), so a rounding line stops inheriting
+    // the 25 % rad-default. Only when the konto carries an explicit default;
+    // otherwise the user's current rate stands. Reverse charge uses its own
+    // rate field, so leave that flow untouched. PostgREST serialises numeric
+    // columns as strings, so coerce: strict === comparisons on vat_rate
+    // (inferVatTreatment) expect a number.
+    const acct = accounts.find((a) => a.account_number === accountNumber)
+    const defaultRate = acct?.default_vat_rate == null ? null : Number(acct.default_vat_rate)
+    if (!watchedReverseCharge && defaultRate != null && Number.isFinite(defaultRate)) {
+      setValue(`items.${index}.vat_rate`, defaultRate, { shouldDirty: true })
+    }
   }
 
   // Periodisering per rad: kräver faktureringsmetoden; eget utlägg bokar
diff --git a/lib/api/__tests__/schemas.test.ts b/lib/api/__tests__/schemas.test.ts
index 4ebeb458..6e33f86c 100644
--- a/lib/api/__tests__/schemas.test.ts
+++ b/lib/api/__tests__/schemas.test.ts
@@ -1175,6 +1175,20 @@ describe('UpdateSettingsSchema', () => {
     expect(result.success).toBe(true)
   })
 
+  it('accepts a positive next_arrival_number (supplier-invoice start floor)', () => {
+    const result = UpdateSettingsSchema.safeParse({ next_arrival_number: 248 })
+    expect(result.success).toBe(true)
+    if (result.success) {
+      expect(result.data.next_arrival_number).toBe(248)
+    }
+  })
+
+  it('rejects a non-positive next_arrival_number', () => {
+    expect(UpdateSettingsSchema.safeParse({ next_arrival_number: 0 }).success).toBe(false)
+    expect(UpdateSettingsSchema.safeParse({ next_arrival_number: -5 }).success).toBe(false)
+    expect(UpdateSettingsSchema.safeParse({ next_arrival_number: 1.5 }).success).toBe(false)
+  })
+
   it('accepts vat_registered: true with required vat_number and moms_period', () => {
     const result = UpdateSettingsSchema.safeParse({
       vat_registered: true,
@@ -2030,6 +2044,25 @@ describe('UpdateAccountSchema', () => {
     const result = UpdateAccountSchema.safeParse({ is_active: 'yes' })
     expect(result.success).toBe(false)
   })
+
+  it('accepts a valid default_vat_rate (0/0.06/0.12/0.25/null)', () => {
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: 0 }).success).toBe(true)
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: 0.06 }).success).toBe(true)
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: 0.12 }).success).toBe(true)
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: 0.25 }).success).toBe(true)
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: null }).success).toBe(true)
+  })
+
+  it('rejects a default_vat_rate outside the allowed set', () => {
+    expect(UpdateAccountSchema.safeParse({ default_vat_rate: 0.2 }).success).toBe(false)
+    expect(CreateAccountSchema.safeParse({
+      account_number: '3740',
+      account_name: 'Öres- och kronutjämning',
+      account_type: 'revenue',
+      normal_balance: 'debit',
+      default_vat_rate: 0.5,
+    }).success).toBe(false)
+  })
 })
 
 // ============================================================
diff --git a/lib/api/schemas.ts b/lib/api/schemas.ts
index 8f5f3d7d..c5ad6748 100644
--- a/lib/api/schemas.ts
+++ b/lib/api/schemas.ts
@@ -1368,6 +1368,7 @@ export const UpdateSettingsSchema = z.object({
   accounting_method: AccountingMethodSchema.optional(),
   invoice_prefix: z.string().nullable().optional(),
   next_invoice_number: z.number().int().positive().optional(),
+  next_arrival_number: z.number().int().positive().optional(),
   invoice_default_days: z.number().int().positive().optional(),
   invoice_default_notes: z.string().nullable().optional(),
   default_our_reference: z.string().max(200).nullable().optional(),
@@ -1540,6 +1541,13 @@ export const CreateDeadlineSchema = z.object({
 // Account schemas
 // ============================================================
 
+// Per-account default VAT rate: the sats the booking UI understands, as a
+// decimal fraction. Mirrors the DB CHECK on chart_of_accounts.default_vat_rate.
+const defaultVatRate = z
+  .union([z.literal(0), z.literal(0.06), z.literal(0.12), z.literal(0.25)])
+  .nullable()
+  .optional()
+
 export const CreateAccountSchema = z.object({
   account_number: accountNumber,
   account_name: z.string().min(1, 'Account name is required'),
@@ -1548,6 +1556,7 @@ export const CreateAccountSchema = z.object({
   plan_type: z.enum(['k1', 'full_bas']).optional(),
   description: z.string().nullable().optional(),
   default_vat_code: z.string().nullable().optional(),
+  default_vat_rate: defaultVatRate,
   sru_code: z.string().nullable().optional(),
 })
 
@@ -1556,6 +1565,7 @@ export const UpdateAccountSchema = z.object({
   is_active: z.boolean().optional(),
   description: z.string().nullable().optional(),
   default_vat_code: z.string().nullable().optional(),
+  default_vat_rate: defaultVatRate,
   sru_code: z.string().nullable().optional(),
 })
 
diff --git a/lib/import/__tests__/account-mapper.test.ts b/lib/import/__tests__/account-mapper.test.ts
index 5b251ce4..c08975d2 100644
--- a/lib/import/__tests__/account-mapper.test.ts
+++ b/lib/import/__tests__/account-mapper.test.ts
@@ -31,6 +31,7 @@ function makeBASAccount(number: string, name: string): BASAccount {
     is_active: true,
     is_system_account: false,
     default_vat_code: null,
+    default_vat_rate: null,
     description: null,
     sru_code: null,
     k2_excluded: false,
diff --git a/messages/en.json b/messages/en.json
index a606e3ec..6f230cd0 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -1340,6 +1340,8 @@
     "prefix_label": "Invoice prefix",
     "prefix_placeholder": "e.g. F-",
     "next_number_label": "Next invoice number",
+    "arrival_start_label": "Supplier invoice start number",
+    "arrival_start_help": "The arrival number (ankomstnummer) your first supplier invoice gets. Set it once to continue the series from a previous system such as Fortnox. After that it increments automatically.",
     "default_days_label": "Payment terms (days)",
     "default_notes_label": "Default invoice text",
     "default_notes_placeholder": "E.g. payment terms, delivery info...",
diff --git a/messages/sv.json b/messages/sv.json
index bddd724a..3bf843fd 100644
--- a/messages/sv.json
+++ b/messages/sv.json
@@ -1340,6 +1340,8 @@
     "prefix_label": "Fakturaprefix",
     "prefix_placeholder": "t.ex. F-",
     "next_number_label": "Nästa fakturanummer",
+    "arrival_start_label": "Startnummer för leverantörsfakturor",
+    "arrival_start_help": "Ankomstnumret som din första leverantörsfaktura får. Sätt det en gång för att fortsätta serien från ett tidigare system, till exempel Fortnox. Därefter räknas numret upp automatiskt.",
     "default_days_label": "Betalningsvillkor (dagar)",
     "default_notes_label": "Standardtext på fakturor",
     "default_notes_placeholder": "T.ex. betalningsvillkor, leveransinfo...",
diff --git a/supabase/migrations/20260709120000_account_default_vat_rate.sql b/supabase/migrations/20260709120000_account_default_vat_rate.sql
new file mode 100644
index 00000000..b1428ea8
--- /dev/null
+++ b/supabase/migrations/20260709120000_account_default_vat_rate.sql
@@ -0,0 +1,54 @@
+-- Per-account default VAT rate ("Standard moms") on the chart of accounts.
+--
+-- Lets a company decide, once per konto, which moms-sats a booking line should
+-- default to when that konto is picked. The motivating case is oresavrundning
+-- (konto 3740, Ores- och kronutjamning): a rounding line must never carry moms,
+-- but the leverantorsfaktura-editor defaulted every rad to 25 %, so the moms and
+-- the rounding came out wrong. NULL keeps today's behaviour (no auto-fill);
+-- 0 = ingen moms. Stored as a decimal fraction to match how the app carries VAT
+-- rates everywhere else (0 / 0.06 / 0.12 / 0.25).
+
+ALTER TABLE public.chart_of_accounts
+  ADD COLUMN IF NOT EXISTS default_vat_rate numeric;
+
+-- Constrain to the sats the app understands; NULL stays allowed (no default).
+ALTER TABLE public.chart_of_accounts
+  DROP CONSTRAINT IF EXISTS chart_of_accounts_default_vat_rate_check;
+ALTER TABLE public.chart_of_accounts
+  ADD CONSTRAINT chart_of_accounts_default_vat_rate_check
+  CHECK (default_vat_rate IS NULL OR default_vat_rate IN (0, 0.06, 0.12, 0.25));
+
+COMMENT ON COLUMN public.chart_of_accounts.default_vat_rate IS
+  'Per-account default VAT rate for booking lines (0/0.06/0.12/0.25). NULL = no default. Oresavrundning (3740) ships as 0 (momsfri).';
+
+-- Existing companies: mark oresavrundning (3740) as momsfri so it stops
+-- inheriting phantom moms. Only touches rows without an explicit value.
+UPDATE public.chart_of_accounts
+  SET default_vat_rate = 0
+  WHERE account_number = '3740' AND default_vat_rate IS NULL;
+
+-- New / imported / on-demand 3740 rows: ship momsfri too, whatever the insert
+-- path (company seed, SIE import, on-demand backfill, manual add). The chart
+-- seed function does not write a VAT column and 3740 is added on demand, so a
+-- BEFORE INSERT default is the one place that covers every path. Fires only
+-- when the caller left the rate unset, so an explicit choice always wins.
+CREATE OR REPLACE FUNCTION public.set_known_momsfri_default_vat_rate()
+RETURNS trigger
+LANGUAGE plpgsql
+SET search_path = public
+AS $$
+BEGIN
+  IF NEW.default_vat_rate IS NULL AND NEW.account_number = '3740' THEN
+    NEW.default_vat_rate := 0;
+  END IF;
+  RETURN NEW;
+END;
+$$;
+
+DROP TRIGGER IF EXISTS trg_chart_of_accounts_momsfri_default ON public.chart_of_accounts;
+CREATE TRIGGER trg_chart_of_accounts_momsfri_default
+  BEFORE INSERT ON public.chart_of_accounts
+  FOR EACH ROW
+  EXECUTE FUNCTION public.set_known_momsfri_default_vat_rate();
+
+NOTIFY pgrst, 'reload schema';
diff --git a/supabase/migrations/20260709130000_supplier_invoice_start_number.sql b/supabase/migrations/20260709130000_supplier_invoice_start_number.sql
new file mode 100644
index 00000000..553030f1
--- /dev/null
+++ b/supabase/migrations/20260709130000_supplier_invoice_start_number.sql
@@ -0,0 +1,67 @@
+-- Configurable starting number for the supplier-invoice series (ankomstnummer).
+--
+-- Mirrors next_invoice_number for customer invoices: lets a company continue
+-- its leverantorsfaktura numbering from a previous system (e.g. Fortnox) when
+-- migrating to Accounted, instead of always restarting the ankomstnummer at 1.
+--
+-- Design: a start FLOOR, not a consumed counter. get_next_arrival_number keeps
+-- its self-healing COALESCE(MAX(arrival_number),0)+1 behavior and floors the
+-- result at next_arrival_number via GREATEST. Consequences:
+--   * Existing companies default to 1, so MAX+1 is unchanged.
+--   * Before the first invoice, the series starts at the configured value.
+--   * Once real invoices pass the floor, MAX+1 dominates: the floor can never
+--     move the series backwards or collide with the
+--     (company_id, arrival_number) unique index.
+--
+-- The function is also hardened while rewritten (it was SECURITY DEFINER with a
+-- mutable search_path, flagged by the DB linter): SET search_path = '', all
+-- references schema-qualified, plus an inline membership check mirroring
+-- generate_invoice_number. NULL auth.uid() (service role / API-key / cron paths
+-- that call this RPC) is trusted through.
+
+ALTER TABLE public.company_settings
+  ADD COLUMN IF NOT EXISTS next_arrival_number integer NOT NULL DEFAULT 1;
+
+ALTER TABLE public.company_settings
+  DROP CONSTRAINT IF EXISTS company_settings_next_arrival_number_positive;
+ALTER TABLE public.company_settings
+  ADD CONSTRAINT company_settings_next_arrival_number_positive
+  CHECK (next_arrival_number >= 1);
+
+CREATE OR REPLACE FUNCTION public.get_next_arrival_number(p_company_id uuid)
+RETURNS integer
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = ''
+AS $function$
+DECLARE
+  v_floor integer;
+  v_next integer;
+BEGIN
+  -- Defense-in-depth: refuse to operate on companies the caller is not a
+  -- member of. NULL auth.uid() (service role / API-key / cron) is trusted
+  -- through, matching generate_invoice_number.
+  IF auth.uid() IS NOT NULL AND NOT EXISTS (
+    SELECT 1 FROM public.company_members
+    WHERE user_id = auth.uid() AND company_id = p_company_id
+  ) THEN
+    RAISE EXCEPTION 'unauthorized: caller is not a member of company %', p_company_id
+      USING ERRCODE = '42501';
+  END IF;
+
+  -- Configured start floor (defaults to 1 for every company; NULL only if the
+  -- settings row is missing, in which case COALESCE keeps the old behavior).
+  SELECT COALESCE(next_arrival_number, 1) INTO v_floor
+  FROM public.company_settings
+  WHERE company_id = p_company_id;
+
+  SELECT GREATEST(COALESCE(MAX(arrival_number), 0) + 1, COALESCE(v_floor, 1))
+  INTO v_next
+  FROM public.supplier_invoices
+  WHERE company_id = p_company_id;
+
+  RETURN v_next;
+END;
+$function$;
+
+NOTIFY pgrst, 'reload schema';
diff --git a/supabase/migrations/__tests__/account-default-vat-rate.pg.test.ts b/supabase/migrations/__tests__/account-default-vat-rate.pg.test.ts
new file mode 100644
index 00000000..f595283f
--- /dev/null
+++ b/supabase/migrations/__tests__/account-default-vat-rate.pg.test.ts
@@ -0,0 +1,108 @@
+import { describe, expect, it } from 'vitest'
+import { seedCompany } from '@/tests/pg/fixtures'
+import { getPool } from '@/tests/pg/setup'
+
+/**
+ * Locks in the behaviour of chart_of_accounts.default_vat_rate
+ * (migration 20260709120000):
+ *
+ *  - a CHECK constraint keeps the rate to the sats the app understands
+ *    (0 / 0.06 / 0.12 / 0.25) or NULL;
+ *  - a BEFORE INSERT trigger ships öresavrundning (3740) as momsfri (0) on
+ *    every insert path (company seed, SIE import, on-demand backfill, manual
+ *    add), so a rounding line never inherits phantom moms;
+ *  - the trigger only fills an unset rate, so an explicit choice always wins;
+ *  - other accounts keep NULL (today's behaviour: no auto-fill).
+ */
+
+async function insertAccount(
+  companyId: string,
+  userId: string,
+  account: {
+    number: string
+    name: string
+    type: string
+    balance?: 'debit' | 'credit'
+    rate?: number | null
+  },
+): Promise<number | null> {
+  const res = await getPool().query<{ default_vat_rate: string | null }>(
+    `INSERT INTO public.chart_of_accounts
+       (user_id, company_id, account_number, account_name, account_class,
+        account_group, account_type, normal_balance, plan_type,
+        is_system_account, default_vat_rate)
+     VALUES ($1, $2, $3, $4, $5, $6, $7, $8, 'full_bas', false, $9)
+     RETURNING default_vat_rate`,
+    [
+      userId,
+      companyId,
+      account.number,
+      account.name,
+      Number(account.number[0]),
+      account.number.slice(0, 2),
+      account.type,
+      account.balance ?? 'debit',
+      account.rate ?? null,
+    ],
+  )
+  const raw = res.rows[0].default_vat_rate
+  return raw === null ? null : Number(raw)
+}
+
+describe('chart_of_accounts.default_vat_rate', () => {
+  it('ships öresavrundning (3740) as momsfri (0) when the rate is unset', async () => {
+    const { companyId, userId } = await seedCompany()
+    const rate = await insertAccount(companyId, userId, {
+      number: '3740',
+      name: 'Öres- och kronutjämning',
+      type: 'revenue',
+    })
+    expect(rate).toBe(0)
+  })
+
+  it('keeps an explicit rate on 3740 (trigger only fills an unset rate)', async () => {
+    const { companyId, userId } = await seedCompany()
+    const rate = await insertAccount(companyId, userId, {
+      number: '3740',
+      name: 'Öres- och kronutjämning',
+      type: 'revenue',
+      rate: 0.25,
+    })
+    expect(rate).toBe(0.25)
+  })
+
+  it('leaves other accounts with no default (NULL)', async () => {
+    const { companyId, userId } = await seedCompany()
+    const rate = await insertAccount(companyId, userId, {
+      number: '5010',
+      name: 'Lokalhyra',
+      type: 'expense',
+    })
+    expect(rate).toBeNull()
+  })
+
+  it('accepts every allowed sats', async () => {
+    const { companyId, userId } = await seedCompany()
+    for (const [i, r] of [0, 0.06, 0.12, 0.25].entries()) {
+      const rate = await insertAccount(companyId, userId, {
+        number: `60${i}0`,
+        name: `Konto ${i}`,
+        type: 'expense',
+        rate: r,
+      })
+      expect(rate).toBe(r)
+    }
+  })
+
+  it('rejects a rate outside the allowed set (CHECK constraint)', async () => {
+    const { companyId, userId } = await seedCompany()
+    await expect(
+      insertAccount(companyId, userId, {
+        number: '5020',
+        name: 'Felaktig sats',
+        type: 'expense',
+        rate: 0.2,
+      }),
+    ).rejects.toThrow()
+  })
+})
diff --git a/tests/helpers.ts b/tests/helpers.ts
index 086c3827..9035a118 100644
--- a/tests/helpers.ts
+++ b/tests/helpers.ts
@@ -538,6 +538,7 @@ export function makeCompanySettings(
     accounting_method: 'accrual',
     invoice_prefix: 'F',
     next_invoice_number: 1,
+    next_arrival_number: 1,
     next_delivery_note_number: 1,
     invoice_default_days: 30,
     invoice_default_notes: null,
diff --git a/tests/pg/supplier-arrival-number.pg.test.ts b/tests/pg/supplier-arrival-number.pg.test.ts
new file mode 100644
index 00000000..49d89389
--- /dev/null
+++ b/tests/pg/supplier-arrival-number.pg.test.ts
@@ -0,0 +1,146 @@
+import { describe, expect, it } from 'vitest'
+import { seedCompany } from '@/tests/pg/fixtures'
+import { getPool, withUserContext } from '@/tests/pg/setup'
+
+/**
+ * Covers 20260709130000_supplier_invoice_start_number:
+ *   - next_arrival_number acts as a start FLOOR for the supplier-invoice
+ *     (ankomstnummer) series: get_next_arrival_number returns
+ *     GREATEST(MAX(arrival_number)+1, next_arrival_number).
+ *   - Default 1 preserves the old MAX+1 behavior.
+ *   - The floor never moves the series backwards once real invoices pass it.
+ *   - The hardened RPC rejects callers who are not company members
+ *     (auth.uid() not null), and lets members through.
+ */
+
+async function ensureSettings(
+  userId: string,
+  companyId: string,
+  nextArrivalNumber: number,
+): Promise<void> {
+  await getPool().query(
+    `INSERT INTO public.company_settings (user_id, company_id, next_arrival_number)
+     VALUES ($1, $2, $3)
+     ON CONFLICT (company_id)
+       DO UPDATE SET next_arrival_number = EXCLUDED.next_arrival_number`,
+    [userId, companyId, nextArrivalNumber],
+  )
+}
+
+async function insertSupplier(userId: string, companyId: string): Promise<string> {
+  const { rows } = await getPool().query<{ id: string }>(
+    `INSERT INTO public.suppliers (user_id, company_id, name)
+     VALUES ($1, $2, 'Test Supplier') RETURNING id`,
+    [userId, companyId],
+  )
+  return rows[0]!.id
+}
+
+async function insertSupplierInvoice(params: {
+  userId: string
+  companyId: string
+  supplierId: string
+  arrivalNumber: number
+}): Promise<void> {
+  await getPool().query(
+    `INSERT INTO public.supplier_invoices
+       (user_id, company_id, supplier_id, arrival_number,
+        supplier_invoice_number, invoice_date, due_date)
+     VALUES ($1, $2, $3, $4, $5, '2026-06-01', '2026-06-30')`,
+    [
+      params.userId,
+      params.companyId,
+      params.supplierId,
+      params.arrivalNumber,
+      `INV-${params.arrivalNumber}`,
+    ],
+  )
+}
+
+async function nextArrival(companyId: string): Promise<number> {
+  const { rows } = await getPool().query<{ n: number }>(
+    'SELECT public.get_next_arrival_number($1) AS n',
+    [companyId],
+  )
+  return rows[0]!.n
+}
+
+describe('get_next_arrival_number: configurable start floor', () => {
+  it('returns 1 when there are no invoices and no settings row', async () => {
+    const { companyId } = await seedCompany()
+    expect(await nextArrival(companyId)).toBe(1)
+  })
+
+  it('returns 1 when the floor is the default and no invoices exist', async () => {
+    const { userId, companyId } = await seedCompany()
+    await ensureSettings(userId, companyId, 1)
+    expect(await nextArrival(companyId)).toBe(1)
+  })
+
+  it('starts the series at the configured floor when no invoices exist', async () => {
+    const { userId, companyId } = await seedCompany()
+    await ensureSettings(userId, companyId, 248)
+    expect(await nextArrival(companyId)).toBe(248)
+  })
+
+  it('continues MAX+1 once an invoice reaches the floor', async () => {
+    const { userId, companyId } = await seedCompany()
+    await ensureSettings(userId, companyId, 248)
+    const supplierId = await insertSupplier(userId, companyId)
+    await insertSupplierInvoice({ userId, companyId, supplierId, arrivalNumber: 248 })
+    expect(await nextArrival(companyId)).toBe(249)
+  })
+
+  it('ignores a floor set below the current MAX (never moves backwards)', async () => {
+    const { userId, companyId } = await seedCompany()
+    const supplierId = await insertSupplier(userId, companyId)
+    await insertSupplierInvoice({ userId, companyId, supplierId, arrivalNumber: 300 })
+    await ensureSettings(userId, companyId, 248)
+    expect(await nextArrival(companyId)).toBe(301)
+  })
+
+  it('is scoped per company (one company floor does not leak into another)', async () => {
+    const a = await seedCompany()
+    const b = await seedCompany()
+    await ensureSettings(a.userId, a.companyId, 500)
+    await ensureSettings(b.userId, b.companyId, 1)
+    expect(await nextArrival(a.companyId)).toBe(500)
+    expect(await nextArrival(b.companyId)).toBe(1)
+  })
+})
+
+describe('get_next_arrival_number: membership hardening', () => {
+  it('rejects a caller who is not a member of the target company', async () => {
+    const intruder = await seedCompany()
+    const target = await seedCompany()
+    await ensureSettings(target.userId, target.companyId, 10)
+
+    await expect(
+      withUserContext(intruder.userId, async (client) => {
+        await client.query('SELECT public.get_next_arrival_number($1)', [target.companyId])
+      }),
+    ).rejects.toThrow(/unauthorized/i)
+  })
+
+  it('allows a member of the target company', async () => {
+    const { userId, companyId } = await seedCompany()
+    await ensureSettings(userId, companyId, 7)
+
+    const result = await withUserContext(userId, async (client) => {
+      const { rows } = await client.query<{ n: number }>(
+        'SELECT public.get_next_arrival_number($1) AS n',
+        [companyId],
+      )
+      return rows[0]!.n
+    })
+
+    expect(result).toBe(7)
+  })
+
+  it('trusts service-role callers (auth.uid() null) through the guard', async () => {
+    // Pool queries run as superuser with no JWT claims, so auth.uid() is NULL:
+    // the membership check is skipped, mirroring API-key / cron paths.
+    const { companyId } = await seedCompany()
+    expect(typeof (await nextArrival(companyId))).toBe('number')
+  })
+})
diff --git a/types/index.ts b/types/index.ts
index 3f6a3d02..3bc590f9 100644
--- a/types/index.ts
+++ b/types/index.ts
@@ -258,6 +258,10 @@ export interface CompanySettings {
   // Invoice settings
   invoice_prefix: string | null
   next_invoice_number: number
+  // Starting ankomstnummer for the supplier-invoice (leverantorsfaktura)
+  // series. Acts as a floor: get_next_arrival_number returns
+  // GREATEST(MAX(arrival_number)+1, next_arrival_number). Defaults to 1.
+  next_arrival_number: number
   next_delivery_note_number: number
   invoice_default_days: number
   invoice_default_notes: string | null
@@ -1394,6 +1398,9 @@ export interface BASAccount {
   is_active: boolean
   is_system_account: boolean
   default_vat_code: string | null
+  // Per-account default VAT rate for booking lines (0/0.06/0.12/0.25).
+  // null = no default (line keeps its own rate). Öresavrundning (3740) = 0.
+  default_vat_rate: number | null
   description: string | null
   sru_code: string | null
   k2_excluded: boolean