Tax Guides
Plain-language guides on federal tax brackets, taxable income, recent tax years, and state income tax—written to help you use the My Taxes calculator with confidence.
Start with any topic below. Each guide links back to the calculator so you can apply what you learn to your own filing status, taxable income, and state.
How Federal Tax Brackets Work
Learn how U.S. progressive federal income tax brackets work, and the difference between marginal and effective tax rates.
How to Find Your Taxable Income on Form 1040
Find the taxable income figure to enter in the My Taxes calculator using Form 1040 and common estimates when you do not have a return handy.
What Is AGI? Adjusted Gross Income in Plain English
Learn what AGI (adjusted gross income) means, how it differs from wages and taxable income, and how to use it in the My Taxes calculator.
Federal Income Tax Brackets for 2025 and 2026
Overview of IRS federal income tax brackets for tax years 2025 and 2026, including inflation adjustments, and how to compare them in the My Taxes calculator.
State Income Tax Overview: Flat, Graduated, and No-Tax States
Understand how state income taxes differ across the U.S.—flat rates, graduated brackets, and states with no wage income tax—and how My Taxes estimates them.
States With No Income Tax
See which U.S. states have no wage income tax, what that means in practice, and how to compare them in the My Taxes calculator.
Year-End Tax Planning Checklist
A practical year-end checklist for estimating taxable income, comparing 2025 vs 2026 brackets, and using My Taxes before December 31.
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My Taxes provides educational estimates from published U.S. federal and state income tax tables. It is not tax advice. See our Disclaimer for details.