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Primary-source check against bas.se (BAS 2026 v2): the official kontoplan has no account 2012; the enskild firma equity block is 2010, 2011, 2013, 2017, 2018, 2019. 2012 'Avräkning för skatter och avgifter' is a program convention (Visma, Bokio, Björn Lundén), not standard BAS, and a non-standard account in BAS_REFERENCE leaks via the backfill into charts, SIE export and SRU filing. - remove 2012 from class-2-equity-liabilities.ts, with a tombstone comment - migration retargets 'Preliminär F-skatt (EF)' lines 2012 -> 2013 (system row plus any clones still carrying the seeded shape) - pin 2012's absence in bas-ef-equity-accounts.test.ts (2113 precedent) - correct the swedish-year-end-closing references that motivated #1388, regenerate atom seed migration Companies whose charts already got 2012 backfilled keep it: existing history stays valid; only future template use books 2013. Closes #1409 Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>