swaitsandClaude Opus 5.5
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Stephen asked that specs come from recognized documents, not from anyone's memory. There is no single US bookkeeping bible; authority is layered, and this records it: - docs/spec/sources/: verbatim excerpts (whitespace normalized), each with URL, retrieval date, and the SHA-256 of the fetched file, of public-domain texts: Pacioli's 1494 treatise in Geijsbeek's 1914 translation (double entry, the trial balance, one money, write only forward, correct by opposite entry, close into capital); IRS Pub. 583, 538, 946, 15; the 1099-MISC/NEC instructions (2025 and 2026); 26 U.S.C. §6041, §6041A, §704; Treas. Reg. §1.263(a)-1(f) and -4(f); Notice 2015-82; Rev. Proc. 98-25; Form 1065 instructions; 17 U.S.C. §105. The excerpts were extracted by matching each passage against the fetched file, so none can contain text the source doesn't. - docs/spec/rules.md: the rule catalog, B-1 to B-22. Each rule says AUTHORITY, CONVENTION, or DECISION; cites its sources (FASB's Codification and Concepts Statement 8 and OpenStax quoted briefly, never copied: copyright and CC BY-NC-SA); and names the code that enforces it and the tests and proofs that check it. - Spec blocks in the code now carry SOURCE: lines into the catalog; AGENTS.md makes sourcing rule 0 of the formal-methods bar. Corrections the sources turned up: the de minimis limit is $500 in the regulation and $2,500 by Notice 2015-82 (both now cited); 1099 thresholds after 2026 are inflation-indexed, so the engine's flat $2,000 for 2027+ is an open question (B-19). Unverified ASC paragraphs (360-10-35-4, 340-10, 230-10-45-10, 606-10-55-37B, 210) are listed in docs/spec/README.md until someone with a FASB basic-view login reads them. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX
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Works of the United States Government are not protected by copyright, and IRS.gov says its content may be freely copied. That is why the IRS, Treasury, and U.S. Code texts in this directory are reproduced verbatim (whitespace normalized), while copyrighted standards (FASB) are only cited. Each excerpt records where it was fetched (2026-10-13) and the SHA-256 of the fetched file.
17 U.S.C. §105(a)
Source: https://www.law.cornell.edu/uscode/text/17/105
Retrieved: 2026-10-13
SHA-256 of the retrieved file (usc105.txt): f3c763446cd8f4e2e0d3d7ec2dd0b1d79fc2e11452e0a417dd2009427797d4be
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