How much is Idaho income tax?
Idaho income tax at 3 levels of Idaho taxable income — what is left after Idaho's own deductions and exemptions. Local income taxes are not included.
| Taxable income | Single | Married filing jointly |
|---|---|---|
| $50,000 | $2,3954.8% effective · 5.3% marginal | $2,1404.3% effective · 5.3% marginal |
| $100,000 | $5,0455.0% effective · 5.3% marginal | $4,7904.8% effective · 5.3% marginal |
| $250,000 | $12,9955.2% effective · 5.3% marginal | $12,7405.1% effective · 5.3% marginal |
What is Idaho's income tax rate for 2026?
| Taxable income | Rate |
|---|---|
| Up to $4,811 | 0% |
| Over $4,811 | 5.3% |
| Taxable income | Rate |
|---|---|
| Up to $9,622 | 0% |
| Over $9,622 | 5.3% |
The first $4,811 of taxable income (single) is taxed at 0%; above it the tax is 5.3% of the excess.
Source: Idaho Code §63-3024 · ISTC EPB00744 (rev. 07-23-2026), checked September 11, 2026.
Can you deduct Idaho income tax on your federal return?
The federal deduction for state and local taxes (SALT) is capped at $40,400 for 2026 — $20,200 if married filing separately — and the cap shrinks toward $10,000 once modified AGI passes $505,000. A single filer with $250,000 of Idaho taxable income owes about $12,995 in Idaho income tax — 32% of that cap before any property tax.
SALT cap workaroundsDoes Idaho have a pass-through entity tax (PTET)?
Yes. A partnership or S corporation can elect to pay Idaho income tax at the entity level. The business deducts it federally, so that state tax is not limited by the SALT cap, and the owners claim an Idaho credit or exclusion for it. Deductsy's plan treats March 15 as the Idaho election or first-payment deadline; it is approximate, so confirm it with Idaho before relying on it.
PTET savings calculatorDoes Idaho require quarterly estimated tax payments?
No. Idaho does not collect estimated tax in quarterly instalments. Instead, prepay at least 80% of this year's tax or 100% of last year's by April 15. Source: Form 51 — Voucher, Estimated Payment of Individual Income Tax, EFO00092 (09-18-2025).
Safe-harbor calculatorAre HSA contributions deductible in Idaho?
Yes. Idaho follows the federal treatment, so an HSA contribution — up to $4,400 with self-only coverage or $8,750 with family coverage for 2026 — lowers Idaho taxable income as well as federal.
Does Idaho give a tax break for 529 plan contributions?
Yes. Idaho lets you deduct up to $6,000 a year of contributions to Idaho's own 529 plan ($12,000 on a joint return). Income limits, per-beneficiary caps and carryforwards differ by state, so check the plan's rules.
529 plan tax savings calculatorWhat is the property tax rate in Idaho?
Idaho's average effective property tax rate is 0.49% — the 45th highest of 51 jurisdictions and 54% of the national average of 0.9%. That is about $490 a year for every $100,000 of home value; the rate varies widely by county and school district.
Itemize or take the standard deduction?How much does an LLC cost to keep in Idaho each year?
Deductsy's table has no annual report fee or minimum franchise tax for an Idaho LLC. Fees change, so confirm with Idaho's business filing office.
Idaho S-corp tax calculatorHow do Idaho taxes compare with neighboring states?
| State | Top income tax rate | Income tax on $100,000 (single) | Property tax (avg) |
|---|---|---|---|
| Idaho | 5.3% | $5,045 | 0.49% |
| Montana | 5.65% | $5,199 | 0.72% |
| Nevada | None | $0 | 0.47% |
| Oregon | 9.9% | $8,449 | 0.81% |
| Utah | 4.45% | $4,450 | 0.52% |
| Washington | None | $0 | 0.81% |
| Wyoming | None | $0 | 0.57% |
On $100,000 of taxable income a single filer's Idaho income tax is $5,045 — more than in 4 of 6 neighboring states. The lowest is Nevada at $0; the highest is Oregon at $8,449. Idaho's average property tax rate is higher than in 1 of 6.
Income tax is each state's own tax on the same state taxable income; local income taxes are not included.
Tax moves that matter most for Idaho
If you own an S corporation, partnership or multi-member LLC, Idaho's PTET election moves the Idaho income tax on that profit to the business, where it is deductible federally and outside the SALT cap.
An S-corp election can cut self-employment tax once profit is large enough to pay yourself a reasonable salary and still cover payroll and filing costs. The Idaho calculator adds Idaho's own entity fees and taxes to that breakeven.
With 1099 income, a Solo 401(k) can take up to $72,000 a year (2026) — usually more than a SEP-IRA at the same income. Contributions lower both federal and Idaho income tax.
Run your Idaho numbers
Open the full optimizer with Idaho pre-selected to see your specific tax picture.
Open the full calculator