| Alabama Department of Revenue (ALDOR) | 2026 Alabama Individual Income Tax Rates | 2026-01-01 | 2026-10-01 |
| Alaska Department of Revenue | Alaska has no state individual income tax | 2026-01-01 | 2026-08-30 |
| Arizona Department of Revenue | Arizona Individual Income Tax rate | 2026-01-01 | 2026-08-29 |
| Arkansas Department of Finance and Administration | Withholding Tax Formula Method, Tax Year 2026 (revised May 2026, top rate 3.7 percent): 2,470 standard deduction, 29 credit per exemption, income looked up at the 50 midpoint of each 100 range below 100,001. Provisional: one exemption for single, head of household and married separate, two for married joint, is assumed | 2026-01-01 | 2026-10-23 |
| California Franchise Tax Board (FTB) | 2026 California Tax Rate Schedules | 2026-01-01 | 2026-08-28 |
| Colorado Department of Revenue | Colorado Income Tax rate | 2026-01-01 | 2026-08-29 |
| Comptroller of Maryland | Maryland Employer Withholding Guide, effective January 2026, percentage method: Single (single, married separate) and Joint (joint, head of household) tables, state rates 4.75 to 6.50 percent taken from the combined state and local tables by removing the local rate, standard deduction 3400, exemption 3200. Provisional: one exemption for single, head of household and married separate, two for joint, is assumed | 2026-01-01 | 2026-10-21 |
| Connecticut Department of Revenue Services (DRS) | 2026 Connecticut Withholding Calculation Rules | 2026-01-01 | 2026-10-01 |
| Delaware Division of Revenue | Delaware Individual Income Tax Rates and Withholding Rules | 2026-01-01 | 2026-10-01 |
| Florida Department of Revenue | Florida has no state individual income tax | 2026-01-01 | 2026-08-29 |
| Georgia Department of Revenue | 2026 Georgia flat income tax rate and standard deduction (HB 463) | 2026-01-01 | 2026-09-08 |
| Hawaii Department of Taxation | 2026 Hawaii Tax Rate Schedules | 2026-01-01 | 2026-10-01 |
| Idaho State Tax Commission | 2026 Idaho Individual Income Tax Rate Schedule | 2026-01-01 | 2026-10-01 |
| Illinois Department of Revenue | Illinois Income Tax rate | 2026-01-01 | 2026-08-29 |
| Indiana Department of Revenue | 2026 Indiana Individual Income Tax Rate | 2026-01-01 | 2026-10-01 |
| Internal Revenue Service (IRS) | 2026 federal income tax brackets and standard deduction amounts | 2026-01-01 | 2026-09-01 |
| Iowa Department of Revenue | 2026 Iowa Individual Income Tax Rate | 2026-01-01 | 2026-10-01 |
| Kansas Department of Revenue | 2026 Kansas Individual Income Tax Rates and Estimated Tax Worksheet | 2026-01-01 | 2026-10-01 |
| Kentucky Department of Revenue | 2026 Kentucky flat income tax rate and standard deduction (withholding formula) | 2026-01-01 | 2026-09-29 |
| Louisiana Department of Revenue | 2026 Louisiana Individual Income Tax Rates and Standard Deduction | 2026-01-01 | 2026-10-01 |
| Maine Revenue Services | 2026 Maine Individual Income Tax Rates | 2026-01-01 | 2026-10-02 |
| Massachusetts Department of Revenue | 2026 Massachusetts personal income tax rate, personal exemptions and 4% surtax | 2026-01-01 | 2026-10-02 |
| Michigan Department of Treasury | Michigan Individual Income Tax rate | 2026-01-01 | 2026-08-29 |
| Minnesota Department of Employment and Economic Development | Provisional: Minnesota Paid Leave 2026 premium 0.88 percent, employee share up to 0.44 percent, wage base 185000 from PayrollOrg (secondary source); full employee share assumed deducted | 2026-01-01 | 2026-10-19 |
| Minnesota Department of Revenue | 2026 Minnesota income tax brackets and standard deduction | 2026-01-01 | 2026-10-19 |
| Mississippi Department of Revenue | 2026 Mississippi flat income tax rate, standard deduction, and personal exemption | 2026-01-01 | 2026-09-26 |
| Missouri Department of Revenue | 2026 Missouri withholding formula: 0 percent to 1348, then 2, 2.5, 3, 3.5, 4 and 4.5 percent in steps of 1348, 4.7 percent above 9436. Provisional: table read from a federal payroll bulletin, married joint mapped to the 32200 deduction | 2026-01-01 | 2026-10-20 |
| Montana Department of Revenue | HB 337 2026 Montana individual income tax: 4.7 percent up to 47500 single and married separate, 71250 head of household, 95000 married joint, 5.65 percent above. Provisional: the federal standard deduction is applied, taken from a secondary source | 2026-01-01 | 2026-10-20 |
| Nebraska Department of Revenue | 2026 Circular EN annual percentage method (Table 7): 2.26, 3.22, 4.21, 4.35, 4.48 and 4.6 percent after a 2440 allowance per withholding allowance. Provisional: one allowance for single and head of household, two for married, married filing separately mapped to the single table | 2026-01-01 | 2026-10-21 |
| Nevada Department of Taxation | Nevada has no state individual income tax | 2026-01-01 | 2026-08-29 |
| New Hampshire Department of Revenue Administration | New Hampshire has no state tax on wages (interest/dividends tax fully repealed Jan 1, 2025) | 2026-01-01 | 2026-08-30 |
| New Jersey Division of Taxation | NJ-WT percentage method tables, annual period: Rate A (single, married separate) and Rate B (joint, head of household), 1.5 to 11.8 percent, 1000 per allowance. Provisional: the table is dated for wages paid on and after October 1 2020, and one allowance for single and head of household, two for joint, is assumed | 2026-01-01 | 2026-10-21 |
| New Mexico Taxation and Revenue Department | FYI-104 New Mexico Withholding Tax (Rev. 11/2025), Table 7 annual percentage method for wages paid on or after January 1, 2026. Married separate uses the single table | 2026-01-01 | 2026-10-23 |
| New York State Department of Taxation and Finance | 2026 New York State Tax Rate Schedules | 2026-01-01 | 2026-08-28 |
| North Carolina Department of Revenue | North Carolina Individual Income Tax rate (reduced to 3.99% effective January 1, 2026, final step of a legislated phasedown) | 2026-01-01 | 2026-08-29 |
| North Dakota Office of State Tax Commissioner | 2026 North Dakota individual income tax: 0 percent up to 49575 single, 82800 married joint, 41400 married separate and 66400 head of household, 1.95 percent up to 250400, 304850, 152425 and 277600, 2.5 percent above. Provisional: thresholds from a secondary source and cross-checked against the official 2026 withholding tables, federal standard deduction applied | 2026-01-01 | 2026-10-20 |
| Ohio Legislative Service Commission | H.B. 96 tax analysis: 2026 Ohio individual income tax table | 2026-01-01 | 2026-10-02 |
| Oklahoma Tax Commission | 2026 Oklahoma individual income tax brackets (H.B. 2764), standard deduction and personal exemption | 2026-01-01 | 2026-10-02 |
| Oregon Department of Revenue | 150-206-436 Oregon Withholding Tax Formulas (Rev. 12-31-25), annual computer formula, 263 per allowance. Provisional: one allowance for single, head of household and married separate, two for married joint, is assumed, and federal tax is estimated by the engine rather than taken from a W-4 | 2026-01-01 | 2026-10-21 |
| Pennsylvania Department of Revenue | Pennsylvania Personal Income Tax rate | 2026-01-01 | 2026-08-29 |
| Rhode Island Division of Taxation | 2026 Rhode Island personal income tax: 3.75 percent to 82050, 4.75 percent to 186450, 5.99 percent above, one schedule for all filers. Standard deduction 11200 single and 22400 married joint plus a 5250 exemption per person, folded into the deduction. Provisional: head of household 16800 and married separate 11200 assumed, deduction phase-out not modelled | 2026-01-01 | 2026-10-20 |
| Social Security Administration (SSA) / IRS | 2026 Social Security and Medicare Tax Rates | 2026-01-01 | 2026-08-28 |
| South Carolina Department of Revenue | WH-1603F Formula for Computing South Carolina 2026 Withholding Tax (Rev. 11/4/25), annual addition method: 0 percent to 3640, 3 percent to 18230, 6 percent above, 5000 per allowance, standard deduction 10 percent of wages up to 7500. Provisional: Act 110 of 2026 (1.99 and 5.21 percent) applies to tax year 2026 but SCDOR had not issued revised withholding tables as of Information Letter 26-23 (October 1, 2026). One allowance for single, head of household and married separate, two for married joint, is assumed | 2026-01-01 | 2026-10-21 |
| South Dakota Department of Revenue | South Dakota has no state individual income tax | 2026-01-01 | 2026-08-30 |
| Tennessee Department of Revenue | Tennessee has no state individual income tax on wages | 2026-01-01 | 2026-08-30 |
| Texas Comptroller of Public Accounts | Texas has no state individual income tax | 2026-01-01 | 2026-08-28 |
| Utah State Legislature | S.B. 60 (2026): Utah individual income tax rate reduced to 4.45% | 2026-01-01 | 2026-10-02 |
| Vermont Department of Taxes | GB-1210-2026 Income Tax Withholding Instructions, Tables, and Charts, annual percentage method: Single and Married tables, 3.35 to 8.75 percent, 5400 per allowance. Provisional: one allowance for single, head of household and married separate, two for married joint, is assumed, and married separate uses the Single table | 2026-01-01 | 2026-10-21 |
| Virginia Department of Taxation | 2026 Virginia individual income tax: 2 percent to 3000, 3 percent to 5000, 5 percent to 17000, 5.75 percent above, same for all filing statuses. Standard deduction 8750 single and 17500 married joint, scheduled to sunset after tax year 2026 | 2026-01-01 | 2026-10-20 |
| Washington State Department of Revenue | Washington has no state tax on wages or salaries | 2026-01-01 | 2026-08-29 |
| West Virginia State Tax Department | 2026 West Virginia personal income tax after SB 392: 2.11 percent to 10000, 2.81 percent to 25000, 3.16 percent to 40000, 4.22 percent to 60000, 4.58 percent above. Provisional: married separate thresholds taken as half, personal exemption 2000 per person | 2026-01-01 | 2026-10-20 |
| Wisconsin Department of Revenue | Publication W-166 Withholding Tax Guide (1/26), alternate method of withholding: single and married deduction formulas, 400 per exemption, rates 3.54 to 7.65 percent. Provisional: one exemption for single, head of household and married separate, two for married joint, is assumed, and married separate uses the single formula | 2026-01-01 | 2026-10-21 |
| Wyoming Department of Revenue | Wyoming has no state individual income tax | 2026-01-01 | 2026-08-30 |
