Idaho charges 5.3% flat state income tax. Use the quarterly tax estimator pre-loaded with Idaho rates.
Open Quarterly Tax Estimator →Quarterly estimated payments in Idaho must cover both your federal and state obligations. Idaho applies a flat 5.3% rate, and most states require their own quarterly payment schedule that may differ from the IRS dates. This estimator pre-loads Idaho's tax rates so you can calculate both federal and state quarterly amounts in one place, avoiding underpayment penalties at both levels.
Idaho levies a flat 5.3% state income tax on all taxable income regardless of how much you earn. This makes tax planning straightforward: for every additional dollar you earn, 5.3 cents goes to Idaho. Idaho does not impose local income taxes, so the 5.3% flat rate is the only state-level income tax you owe.
The table below shows what you actually keep at five salary levels in Idaho, accounting for federal tax, FICA, and Idaho's flat 5.3% state tax.
See how Idaho compares to other West states. Each link takes you to the quarterly tax estimator landing page for that state.
For a comprehensive breakdown of Idaho’s tax structure, salary comparisons, cost-of-living analysis, and more, visit the full Idaho take-home pay page.