Tax Reference Guide

Source information for the 2025 tax year tax calculator

Tax Data Sources for 2025 Tax Year

The WonkTax calculator uses official tax information from federal and state government sources to provide accurate tax estimates.

Federal Tax References

IRS Standard Deduction & Tax Brackets

Official IRS guidance on inflation adjustments for tax year 2025, including standard deduction amounts and tax bracket thresholds.

IRS Tax Inflation Adjustments (2025) IRS Topic 751: Social Security and Medicare Withholding IRS Topic 503: Deductions, Exemptions, and Filing Status H.R. 1 - One Big Beautiful Bill Act

State Tax References

California

California has yet to pass official tax rates for the 2025 tax year.

California Assembly Bill 1219: Personal Income Tax Rate California Franchise Tax Board: Tax Tables and Rates

Texas

Texas does not impose a state income tax.

Texas Comptroller: Tax Information

Florida

Florida does not impose a state income tax.

Florida Department of Revenue

New York

New York has yet to finalize official tax rates for the 2025 tax year.

NYC Income Tax Rate: What to Expect in 2025 New York State Department of Taxation: Tax Tables

Pennsylvania

Pennsylvania maintains a flat income tax rate of 3.07%.

TurboTax: Pennsylvania Tax Information

Illinois

Illinois maintains a flat income tax rate of 4.95% with personal exemption allowances for the 2025 tax year.

Illinois Department of Revenue: Income Tax Rates Illinois Personal Exemption Allowance Information

Georgia

Georgia has a flat income tax rate of 5.19% for the 2025 tax year.

Lt. Governor Statement: Income Tax Cut and Rebate Passage Georgia Department of Revenue: Important Tax Updates

North Carolina

North Carolina uses a flat income tax rate of 4.25% for the 2025 tax year.

NC Department of Revenue: Tax Rate Schedules NC Department of Revenue: Standard Deduction Information Changes in Income Tax Affecting NC Residents for 2025

Michigan

Michigan maintains a flat income tax rate of 4.25%.

TurboTax: Michigan Tax Information

Virginia

Virginia tax information for the 2025 tax year including budget amendments and filing season updates.

Virginia Budget Amendment (2025) Virginia Department of Taxation: Deductions Virginia Individual Income Tax

Washington

Washington does not impose a state income tax.

Washington Department of Revenue

Arizona

Arizona has a flat income tax rate of 2.5% for 2025 and matches federal standard deductions.

Arizona Tax Pros: Fast Facts & Standard Deductions Arizona Individual Filing Requirements Arizona Conforms to Federal Tax Regulations

Massachusetts

Massachusetts tax rates for 2025.

Massachusetts Tax Rates Massachusetts Income Tax Withholding Tables (2025)

Indiana

Indiana tax information for the 2025 tax year.

Indiana State Taxes Guide Indiana County Tax Rates and Codes

Maryland

Maryland tax updates for 2025.

Maryland Comptroller: 2025 Tax Updates Maryland Budget Fiscal Documents (2025) Maryland Resident Tax Booklet

Minnesota

Minnesota's tax brackets for 2025.

Minnesota Revenue: 2025 Tax Brackets

Louisiana

Louisiana enacted significant tax reform for 2025.

Louisiana Tax Reform (2025)

Nevada

Nevada does not impose a state income tax.

Nevada Department of Taxation

Mississippi

Mississippi tax rates for 2025.

Mississippi Department of Revenue: Tax Rates, Exemptions & Deductions

Iowa

Iowa has a flat income tax rate of 3.8% for 2025 and matches federal standard deductions.

IDR Issues New Income Withholding Tax Tables for 2025 Iowa Senate File 2417: Tax Reform Legislation

Maine

Maine income tax rate schedules for 2025.

Maine Revenue Services: 2025 Tax Rate Schedules

Oklahoma

Oklahoma's tax information for 2025 tax year.

Oklahoma Lawmakers Pursuing Flat State Income Tax

Tennessee

Tennessee does not impose a state income tax.

Tennessee Department of Revenue

Hawaii

Hawaii tax rates for 2025.

Hawaii Tax Reform (2025)

New Hampshire

New Hampshire does not tax wages or earnings, but does tax investment income.

New Hampshire Department of Revenue Administration

South Dakota

South Dakota does not impose a state income tax.

South Dakota Department of Revenue

Alaska

Alaska does not impose a state income tax.

Alaska Department of Revenue - Tax Division

Wyoming

Wyoming does not impose a state income tax.

Wyoming Department of Revenue