Apply WA capital gains 9.9% tier only from 2025 (ESSB 5813)#9023
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Apply WA capital gains 9.9% tier only from 2025 (ESSB 5813)#9023PavelMakarchuk wants to merge 1 commit into
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The ESSB 5813 (Ch. 421, Laws of 2025) 2.9% surcharge over $1,000,000 begins January 1, 2025 (Sec. 101; Sec. 301: 'applies to taxes imposed in calendar year 2025'). The bracket was defined only from 2025-01-01, and core backfills first bracket values to the timeline start, so the 9.9% tier leaked into 2022-2024, overcharging 2.9% on the excess over $1M. Adds explicit 2022 values (flat 7%) and year-pair tests. Fixes #9022 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Fixes #9022. Backward-leak class (#9008): core backfills a bracket's first value to the timeline start, so the
2025-01-01-only $1M/9.9% bracket resolved identically at 2022–2024 instants.Source (verbatim, ESSB 5813, Ch. 421, Laws of 2025) — Sec. 101: "an additional excise tax is imposed on the sale or exchange of long-term capital assets, which equals 2.90 percent multiplied by the portion of an individual's Washington capital gains exceeding $1,000,000" — "Beginning January 1, 2025." Sec. 301: "Section 101 of this act applies to taxes imposed in calendar year 2025 for collection in calendar year 2026." 2022–2024 law (RCW 82.87.040 as enacted): "the tax, which equals seven percent multiplied by an individual's Washington capital gains."
Change: explicit
2022-01-01values on the second bracket (threshold $1,000,000, rate 0.07) so the scale is flat 7% before 2025; 9.9% from2025-01-01unchanged.Tests: 2023 taxable LTCG $2,000,000 → $140,000 (previously $169,000); 2025 twin → $169,000. All 8 WA capital-gains tests pass.
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