Tax year 2026 figures. Last updated .
A tax calculator that has never published a correction is either perfect or not looking. This one is not perfect. Each entry below records a figure that a source we consulted got wrong — in several cases a source we had already written into the data file — and what the statute or the revenue department actually says.
None of these reached a published figure. Every one was caught before or at the point of verification, which is the whole reason the engine refuses to compute from unverified data. That is luck as much as process, and it is why the log is public.
The log
· superseded by later legislation · caught before publication
Georgia — flat income tax rate
What was wrong. The data file carried 5.19%, sourced from Tax Foundation. That was the rate HB 111 set in April 2025, and the rate Georgia did begin 2026 under.
What it is. HB 463 reduced it to 4.99% effective 1 January 2026. The Department of Revenue states it directly: "The Georgia income tax rate has been reduced to a flat rate of 4.99%."
Source: Georgia Department of Revenue, Important Tax Updates
· introduced bill mistaken for law · caught before publication
Kentucky — flat income tax rate
What was wrong. A search result asserted 4% for tax year 2026, citing HB 152 of the 2026 session. HB 152 is an introduced bill, not an enacted one.
What it is. KRS 141.020(2)(f): "For taxable years beginning on or after January 1, 2026, the tax shall be three and one-half percent (3.5%) of net income."
Source: Ky. Rev. Stat. 141.020(2)(f)
· expired provision quoted as current · caught before publication
Kansas — zero-rate band
What was wrong. A research pack presented a zero-rate band as part of the current Kansas bracket structure. The text is genuinely in the statute.
What it is. It expired. K.S.A. 79-32,110 applied the zero-rate provision only "for tax years 2018 through 2023". For 2026 the rates are 5.2% and 5.58% with no zero band.
Source: K.S.A. 79-32,110
· stale year republished as current · caught before publication
Massachusetts — Fair Share surtax threshold
What was wrong. Secondary sources circulated $1,053,750 as the current surtax threshold. That is the 2024 figure, republished as though it were current.
What it is. The Department certifies a new amount annually. For tax year 2026 it is $1,107,750. The series runs $1,000,000 (2023), $1,053,750 (2024), $1,083,150 (2025), $1,107,750 (2026).
Source: MA DOR 2026 Form 2-ES, "Taxpayers Subject to the 4% Surtax"
· secondary source disagreed with statute · caught before publication
Washington — long-term capital gains excise
What was wrong. Tax Foundation listed Washington at 9%, and that figure was carried into an early draft of the state data.
What it is. RCW 82.87.040 imposes 7% on long-term gains plus an additional 2.90% on the portion above $1,000,000 — a 9.9% marginal rate, not 9%.
Source: RCW 82.87.040
What these have in common
Not one of them was a transcription slip. Every entry is a case where a source was internally plausible and simply not the operative rule — superseded by a later act, an introduced bill that never passed, a provision that expired years ago, or last year's figure republished without its year. The full taxonomy, with the checks each one implies, is on the methodology page.
The practical consequence is the rule this project runs on: a figure is either read from a primary source or it is not used, and a quotation is not evidence on its own — the years a provision applies to are part of the figure. How that is enforced is set out in the editorial policy.
Found one?
Corrections are the most useful thing anyone can send. Include the inputs you used, the figure you got, the figure you believe is right, and a primary source — a statute section, a revenue department page, or a Revenue Procedure. The Show your work panel names the rule and citation behind every line, which usually pinpoints the disputed figure exactly. Contact details are here.