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Idaho Income Tax Calculator 2026 — Flat 5.8% Rate
Estimated Idaho state income tax at common income levels, combined federal + state burden, and the full Idaho tax bracket table — 2025 rates.
Reviewed for accuracy June 2026 by Gary Sing
State tax type
Flat 5.8%
State tax at $75k
$4,350
Federal tax at $75k
$8,114
Combined eff. rate $75k
16.6%
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Idaho income tax at common income levels — 2025
Single filer, 2025 federal standard deduction ($15,000). Federal tax uses 2025 IRS brackets.
| Income | Idaho state tax | State eff. rate | Federal tax | Total tax | Total eff. rate |
|---|---|---|---|---|---|
| $50,000 | $2,900 | 5.8% | $3,962 | $6,862 | 13.7% |
| $75,000 | $4,350 | 5.8% | $8,114 | $12,464 | 16.6% |
| $100,000 | $5,800 | 5.8% | $13,614 | $19,414 | 19.4% |
Single filer. Federal tax computed on gross income minus $15,000 standard deduction using 2025 IRS brackets. State tax estimates are approximate — consult a tax professional for exact liability. Does not include FICA (Social Security + Medicare), local taxes, or deductions beyond the standard deduction.
Idaho state income tax rate 2025
Flat rate: 5.8% on all taxable income
Idaho has a flat 5.8% income tax rate on income above approximately $2,500 (single filers). Idaho has been gradually reducing its income tax rate through recent legislation as part of broader tax reform efforts.
| Income | State tax rate | Note |
|---|---|---|
| All taxable income | 5.8% | Applied to federal AGI |
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Idaho income tax — frequently asked questions
Does Idaho have a state income tax?
Yes. Idaho has a flat 5.8% income tax rate that applies to all taxable income.
What is the Idaho state income tax rate for 2025?
Idaho has a flat 5.8% state income tax rate for 2025. This rate applies to all taxable income.
How much Idaho state income tax do I owe on $75,000?
On a $75,000 gross income (single filer, 2025), estimated Idaho state income tax is approximately $4,350 (effective rate: 5.8%). Combined with federal income tax of approximately $8,114, total tax is about $12,464 — an overall effective rate of 16.6%.
What is the combined federal and Idaho state income tax at $100,000?
At $100,000 gross income (single filer, 2025 standard deductions): federal income tax is approximately $13,614, Idaho state income tax is $5,800, for a combined total of approximately $19,414 — an overall effective rate of 19.4%.
How does Idaho's income tax compare to other states?
Idaho's top rate of 5.8% places it in the moderate range nationally. The nine states with no income tax pay $0 in state income tax; the highest-tax states (California at 13.3%, Hawaii at 11%) have the largest state income tax burdens.