Idaho has a state income tax

Idaho taxes your income at the state level. Unlike seven other states (Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming), Idaho does collect income tax from residents and from people who work in the state.

The tax applies to wages, self-employment income, investment income, and retirement distributions. If you live in Idaho or work there, you will file a state tax return in addition to your federal return. The state uses a progressive tax structure, meaning the rate increases as your income increases.

Key Takeaways

  • Idaho's state income tax rates range from 1% to 5.8%, depending on your total income for the year.
  • You must file a state return if you earned income in Idaho or lived there during the tax year, even if you owe no tax.
  • Idaho allows deductions for federal income tax paid, mortgage interest, charitable donations, and other expenses, similar to federal rules.
  • Retirees may exclude up to $35,000 of retirement income (Social Security, pensions, IRAs) from state taxation under current law.

How Idaho's tax brackets work

Idaho uses tax brackets that change each year. For the 2024 tax year, the state has six brackets ranging from 1% on the lowest income to 5.8% on the highest. The exact dollar amounts where each bracket begins shift annually based on inflation.

The brackets apply to your taxable income, not your total income. Taxable income is what remains after you subtract the standard deduction (or itemized deductions if you choose that route) and any other deductions you claim. A single filer with a lower income may pay only 1% or 2%, while someone with six-figure income pays the full 5.8% on the portion above the highest bracket threshold.

You can find the exact 2024 brackets on the Idaho State Tax Commission website. Because they adjust yearly, checking the current year's brackets before filing or calculating estimated tax is important.

Deductions and credits available in Idaho

Idaho allows you to deduct federal income tax paid to the IRS, which is unusual—most states do not allow this. You can also deduct mortgage interest, property taxes (up to a limit), charitable contributions, and medical expenses that exceed a threshold, following rules similar to federal tax law.

The state offers a standard deduction, which varies by filing status. For 2024, a single filer receives a standard deduction; married couples filing jointly receive a higher amount. You can choose to itemize deductions instead if your total deductible expenses exceed the standard deduction.

Idaho also provides tax credits for things like dependent care expenses, residential energy credits, and property tax relief for certain low-income seniors and disabled people. Credits reduce your tax bill dollar-for-dollar, making them more valuable than deductions.

Retirement income and the $35,000 exclusion

Idaho allows residents age 55 and older to exclude up to $35,000 of retirement income from state taxation. This applies to Social Security benefits, pension payments, distributions from IRAs and 401(k)s, and annuity income. The exclusion is one of the more generous retirement provisions among states with income tax.

To claim the exclusion, you must meet the age requirement and report the income on your state return. The $35,000 limit applies to the total of all retirement income sources combined, not per source. If you have $50,000 in combined retirement income, you exclude $35,000 and pay tax on $15,000.

This provision makes Idaho relatively favorable for retirees compared to states that tax all retirement income. However, you still pay tax on wages, investment gains, and other non-retirement income above the exclusion limit.

Who must file a state return

You must file an Idaho state return if you lived in Idaho at any point during the tax year and had income, or if you worked in Idaho and earned wages there. The income threshold for filing is lower than the federal threshold, so you may need to file a state return even if you do not owe federal tax.

Nonresidents who worked in Idaho during the year must also file, reporting only the income earned in the state. If you moved to or from Idaho mid-year, you file as a part-year resident and report income for the months you were there.

Even if you owe no tax, filing may be required to claim refundable credits or to document that you paid tax through withholding. Check the Idaho State Tax Commission website or call their taxpayer assistance line for your specific situation.

How to file your Idaho state return

You file your Idaho return using Form 40 (the main individual income tax form) or Form 40-N (for nonresidents). You can file by mail, electronically through the state's online system, or through tax software that supports Idaho returns. The deadline is the same as the federal deadline, usually April 15.

If you use tax software, select Idaho as your state and the software will walk you through the state-specific questions. If you file by mail, order forms from the Idaho State Tax Commission or download them from the website. Include all required schedules (for deductions, credits, or out-of-state income) and sign the return.

The state processes returns and issues refunds or bills within several weeks of receipt. You can check the status of your refund on the Tax Commission website using your Social Security number and the amount of your refund.

Frequently Asked Questions

Do I have to pay Idaho income tax if I just moved there?

If you moved to Idaho partway through the year, you file as a part-year resident and pay tax only on income earned while you lived there. You report the months you were in Idaho on your return. If you moved in December, you may owe very little or nothing depending on your income that month.

What if I work in Idaho but live in another state?

You must file an Idaho nonresident return reporting the wages you earned in Idaho. You also file a return in your home state for income earned there. Some states have reciprocal agreements to avoid double taxation, but you should check both states' rules. Idaho taxes all income earned within the state regardless of where you live.

Can I deduct federal income tax paid on my Idaho return?

Yes. Idaho allows you to deduct federal income tax you paid during the year, which is one of the few states that permits this. You report the amount on your state return. This deduction can lower your Idaho taxable income and reduce what you owe the state.

Is Social Security taxed in Idaho?

Social Security is not taxed in Idaho if you are age 55 or older, because it falls under the $35,000 retirement income exclusion. If you are under 55, Social Security may be taxable under state law, though federal rules may also affect how it is treated. Check with a tax professional if your situation is complex.

Where do I send my Idaho tax return?

Mail paper returns to the address shown on the form instructions, or file electronically through the Idaho State Tax Commission website. The mailing address and electronic filing portal are listed on the Tax Commission's website. Electronic filing is faster and reduces errors.