Tax Data Sources
Primary government publications and agency pages used by the calculation engine. A source link does not mean the agency endorses this calculator.
Source inventory last reviewed October 4, 2026
Federal Sources
2025 federal brackets and standard deductions
Internal Revenue Service
2026 federal brackets and standard deductions
Internal Revenue Service
Social Security wage base
Social Security Administration
Social Security and Medicare tax rates
Internal Revenue Service
Additional Medicare Tax
Internal Revenue Service
401(k) contribution limits
Internal Revenue Service
State & District Sources
These links are collected from every state-tax and employee payroll-program line returned by the live 2026 calculation path.
| Jurisdiction | Code | Official source |
|---|---|---|
| Alabama | AL | |
| Alaska | AK | |
| Arizona | AZ | |
| Arkansas | AR | |
| California | CA | |
| Colorado | CO | |
| Connecticut | CT | |
| Delaware | DE | |
| District of Columbia | DC | |
| Florida | FL | |
| Georgia | GA | |
| Hawaii | HI | |
| Idaho | ID | |
| Illinois | IL | |
| Indiana | IN | |
| Iowa | IA | |
| Kansas | KS | |
| Kentucky | KY | |
| Louisiana | LA | |
| Maine | ME | |
| Maryland | MD | |
| Massachusetts | MA | |
| Michigan | MI | |
| Minnesota | MN | |
| Mississippi | MS | |
| Missouri | MO | |
| Montana | MT | |
| Nebraska | NE | |
| Nevada | NV | |
| New Hampshire | NH | |
| New Jersey | NJ | |
| New Mexico | NM | |
| New York | NY | |
| North Carolina | NC | |
| North Dakota | ND | |
| Ohio | OH | |
| Oklahoma | OK | |
| Oregon | OR | |
| Pennsylvania | PA | |
| Rhode Island | RI | |
| South Carolina | SC | |
| South Dakota | SD | |
| Tennessee | TN | |
| Texas | TX | |
| Utah | UT | |
| Vermont | VT | |
| Virginia | VA | |
| Washington | WA | |
| West Virginia | WV | |
| Wisconsin | WI | |
| Wyoming | WY |
Local Sources
New York City resident income tax
New York Department of Taxation and FinancePhiladelphia, PA
Official local sourcePittsburgh, PA, Scranton, PA, Allentown, PA, Reading, PA, Erie, PA, Lancaster, PA, Harrisburg, PA, State College, PA
Official local sourceColumbus, OH
Official local sourceCleveland, OH
Official local sourceCincinnati, OH
Official local sourceToledo, OH
Official local sourceAkron, OH
Official local sourceDayton, OH
Official local sourceDetroit, MI
Official local sourceGrand Rapids, MI
Official local sourceLansing, MI
Official local sourceFlint, MI
Official local sourceMarion County (Indianapolis), IN, Lake County, IN, Allen County (Fort Wayne), IN, Hamilton County (Carmel/Fishers), IN, Monroe County (Bloomington), IN
Official local sourceLouisville / Jefferson County, KY
Official local sourceLexington / Fayette County, KY
Official local sourceKansas City, MO
Official local sourceSt. Louis, MO
Official local sourceFound a Discrepancy?
Government pages may change after a tax update. Include the jurisdiction, tax year, expected rate, and official source when reporting an issue.
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