Idaho Income Tax Rates 2025
Idaho has a flat income tax rate of 5.3%, charged on taxable income above an inflation-adjusted floor — $4,811 for a single filer and $9,622 on a joint return for 2025. Income below that floor is not taxed. The state moved to a flat tax structure in 2023, simplifying its previous progressive bracket system, and cut the rate to 5.3% in 2025 (HB40).
Tax Type
Flat
Rate Range
5.3% flat
Brackets
1
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Idaho is only part of the equation — federal taxes apply too.
State Tax Ranking
At $75,000 income (single filer), Idaho ranks #30 out of 51 states — where #1 is the lowest tax burden.
Best states to move to from Idaho →Tax at Different Income Levels
| Income | State Tax | Effective Rate | Take-Home |
|---|---|---|---|
| $50,000 | $1,560 | 3.12% | $44,568 |
| $75,000 | $2,885 | 3.85% | $64,166 |
| $100,000 | $4,210 | 4.21% | $82,341 |
| $150,000 | $6,860 | 4.57% | $118,073 |
| $200,000 | $9,510 | 4.76% | $153,423 |
Single filer, standard deduction, 2025 tax year. Take-home is after federal + state income tax (excludes FICA).
Tax Overview
This state uses a flat income tax rate, meaning the same percentage applies to all taxable income regardless of how much you earn. This simplifies tax planning but means there is no bracket benefit for lower earners. The effective rate is very close to the headline rate after deductions.
Tax Planning Tip
With a flat tax rate, your effective state rate is predictable and consistent. Focus tax reduction on pre-tax contributions (401k, HSA) and any state-specific deductions or credits available.
Because Idaho Code 63-3024 imposes the 5.3% rate on taxable income over the floor rather than on every dollar, the floor is worth up to $255 of tax to a single filer and $510 on a joint return, and everything above it is taxed at the same rate no matter how much you earn. Idaho conforms closely to the federal tax code for determining taxable income, with some modifications. The state does not tax Social Security benefits.
Property Tax & Cost of Living
Property tax rate is the state average effective rate. Actual rates vary by county. COL index from BEA Regional Price Parities by state (2024, all items; national average = 100).
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Frequently asked questions
What is Idaho's income tax rate in 2026?
Idaho charges a flat 5.3% on taxable income above an annually adjusted floor, which was $4,811 for single filers and $9,622 for joint filers in 2025. Below that floor you owe no Idaho income tax; above it, every dollar is taxed at the same 5.3%.
Does Idaho tax Social Security benefits?
Idaho does not tax Social Security benefits at the state level.
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