Corrections
What was wrong on this site, when it was found, what the source says and what changed. Corrections are made in the data so that every page that used the figure changes at once; this list is the record.
Written and edited by Pablo Ruiz QuinteroSources checked September 15, 2026Written and maintained by Pablo Ruiz Quintero; last reviewed 2026-09-15How corrections work
A reader reports a discrepancy through the form on any calculator, or a routine check finds one. The figure is compared with the primary document. If the document says otherwise, the constant is corrected, the tests are updated with the document's own example, the change ships, and an entry appears here with the date, the scope, what was wrong and why. If the document agrees with the site, the reporter gets an explanation and nothing changes. Entries are never removed, and a correction to a correction is a new entry.
Corrections to compiled data
Before launch, state rules were loaded from secondary sources and then read one by one in each state's own publication. Where the compiled figure did not match, the state's entry in the verification log is marked «corrected» and appears in the list below with what was found. That is the largest class of correction on the site, and the reason no state page is published without a log entry.
Report one
Use the contact page with the page, the figure and the document that contradicts it. A reply comes from the author; a correction, if one is due, appears here.
The list
The 2.5% flat rate was right; the standard deduction was not. Arizona has conformed to the FEDERAL standard deduction since 2019, so for 2026 it is $16,100 / $32,200. The compiled figure we held was roughly half that, overstating taxable income by about $7,750 and the bill by about $194. Corrected.
Checked against Arizona DOR, Individual Income Tax Highlights and IRC conformity; the compiled figure did not match and was corrected. · page
The standard deduction did not match. The 2026 Form 540-ES says literally "$5,706 single or married/RDP filing separately" and "$11,412 married/RDP filing jointly, head of household"; we were serving 2025's figures. Note also that the FTB has not published 2026 brackets — its own form instructs filers to "figure your tax using the 2025 tax table", so the brackets we serve are 2025's, which is exactly what the state tells you to do. The page says so.
Checked against California FTB, 2026 Instructions for Form 540-ES; the compiled figure did not match and was corrected. · page
The rate was not 5.19%. HB 463 cut it to 4.99% effective 1 January 2026, per the Governor's own release. This is the clearest illustration of why compiled sources fail: the bill was signed in MAY 2026 and backdated, so any table published before that date says 5.19% and was correct when it was written. Georgia hits its 4.99% target three years ahead of the schedule set in HB 1015.
Checked against Office of the Governor of Georgia, press release of 11 May 2026 on HB 463; the compiled figure did not match and was corrected. · page
All four brackets match. The 2026 exemption credit is $260 and we had $256 — corrected. Oregon is permanently tied to the federal definition of taxable income, so federal changes pass straight through. The Multnomah County and Portland metro local taxes remain outside the engine.
Checked against Oregon DOR, Oregon Withholding Tax Formulas 150-206-436 (rev. 31 Dec 2025) and Publication OR-ESTIMATE 2026; the compiled figure did not match and was corrected. · page
All seven single brackets match; one rate was wrong — the fourth is 5.525%, not 5.53%. The more important find was in the same document: New Jersey's joint and head-of-household table has EIGHT brackets, one more than the single table, including a 2.45% band between $50,000 and $70,000 that a single filer never sees. Now loaded, making New Jersey the first progressive state to drop our joint-bracket approximation warning. It also exempts filers below $10,000 ($20,000 joint) from withholding, a rule the engine does not yet model.
Checked against NJ Division of Taxation, 2026 Form NJ-1040-ES — Rate Schedules; the compiled figure did not match and was corrected. · page
The 5.0% rate matches; the surtax threshold did not. For 2026 it is $1,107,750 and we had $1,083,150, which is 2025's. The Fair Share threshold is indexed to inflation every year, so it expires on its own and has to be re-read each January alongside the federal figures.
Checked against Mass.gov, "Massachusetts 4% Surtax on Taxable Income" and Circular M effective 1 January 2026; the compiled figure did not match and was corrected. · page
The 2026 standard deduction is $3,400 and we had $3,350 — corrected. The brackets, including the two high-income ones added after 2024, match. Maryland is doubly incomplete in the engine: the local rates of its 23 counties and Baltimore City run from 2.25% to 3.30% and are NOT included, and since 2025 there is a 2% surcharge on net capital gains above $350,000 of federal AGI that we do not model either.
Checked against Comptroller of Maryland, 2026 withholding guide and 2025 legislative session tax alert; the compiled figure did not match and was corrected. · page
THE LARGEST ERROR WE FOUND. Ohio does not apply a flat rate from the first dollar: for 2026 it taxes nothing below $27,350 of taxable income and charges 2.75% only above that. Our model charged 2.75% on almost all income — about $2,272 on $85,000 where the correct figure is about $1,585, an overstatement of 43%, and proportionally worse the lower the salary. Corrected to a two-bracket structure, 0% and 2.75%. Ohio completes a two-year transition in 2026: the top rate fell from 3.5% to 3.125% in 2025 before consolidating.
Checked against Ohio Revised Code § 5747.02 and the Legislative Service Commission analysis of HB 96; the compiled figure did not match and was corrected. · page
South Carolina rebuilt its entire income tax for 2026. We held the old three-bracket structure (0%, 3%, 6%); H. 4216, signed 30 March 2026, replaces it with 1.99% below $30,000 and 5.21% above. The formula the department publishes is "5.21% minus $966", which is a calculation on total income rather than a marginal bracket — we checked that it is exactly equivalent to two marginal brackets of 1.99% and 5.21% with the boundary at $30,000, since both give $597 at the cut point, so the function is continuous and the engine reproduces it without changing its logic. Still outstanding and declared: the law decouples South Carolina from the federal standard deduction and creates the South Carolina Income Adjusted Deduction, and we still serve the federal figure. It also caps the state EITC at $200.
Checked against SCDOR, "Information about H. 4216"; the compiled figure did not match and was corrected. · page
Same error pattern as Ohio. We held it as a flat 4% from the first dollar; Mississippi does not tax the first $10,000 of taxable income and applies 4% only above that. It overstated by roughly $400 on an $85,000 salary and proportionally more the lower the income. This was the second state where a compiled source had omitted an exempt band, which is what prompted us to go back and audit every remaining "flat" state deliberately. Exemptions confirmed: $6,000 single, $12,000 married, $9,500 head of household; deduction $2,300 / $4,600.
Checked against Mississippi DOR, Pub 89-700 — Withholding Income Tax Tables and Employer Instructions (rev. 01-2026); the compiled figure did not match and was corrected. · page
All twelve brackets match. The deduction did not: for 2026 it is $8,000 single, $16,000 joint and $12,000 head of household, and we had $4,400 / $8,800 — roughly half. Hawaii's 2024 tax cut raised the deduction in steps and the compiled source stayed anchored to the earlier figure, overstating by about $280 on an $85,000 salary. The $1,144 personal exemption was correct, and there is an additional one from age 65 that we do not apply.
Checked against Hawaii DOT, tax tables and rate schedules for years beginning after 31 Dec 2024, and the 2026 payroll update; the compiled figure did not match and was corrected. · page
The 3% flat rate matches. The deduction did not: the department publishes $12,500 single and $25,000 joint for tax years beginning on or after 1 January 2025, and we had $12,875 / $25,750. Our figures carried an inflation adjustment of about 3% that Louisiana does NOT apply — its FAQ gives a fixed amount and never mentions indexing. This is the inverse of the California and Massachusetts pattern: there an update was missing, here we had applied one nobody made. Corrected. Note also that Louisiana's withholding tables use 3.09%, not 3%, and the department explains that in a separate FAQ.
Checked against Louisiana DOR, income tax reform FAQ; the compiled figure did not match and was corrected. · page
Sources
An estimate for planning, not tax or payroll advice.
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- Methodology
How every figure is computed and checked.
- Sources
Every parameter, its document, its date.
- Corrections
What was wrong, when, and the fix.