Idaho has a state income tax

Idaho charges a state income tax on wages, self-employment income, interest, dividends, and other earnings. The tax rate depends on your income level — Idaho uses a progressive tax system with rates that increase as your income rises. For the 2024 tax year, rates range from 1% on the lowest bracket to 5.8% on the highest.

Unlike some states, Idaho does not have a flat tax. Your actual rate depends on which tax bracket your income falls into. You will owe Idaho state income tax if you are a resident or if you earned income within the state, even if you live elsewhere.

Key Takeaways

  • Idaho's state income tax rates range from 1% to 5.8% depending on your income level for the 2024 tax year.
  • You owe Idaho income tax if you are a resident or earned money in Idaho, regardless of where you currently live.
  • Idaho taxes wages, self-employment income, interest, dividends, capital gains, and retirement distributions.
  • You file Idaho state taxes using Form 40 (the main return) along with any required schedules for your specific income sources.

Idaho's tax brackets and rates for 2024

Idaho's income tax brackets change each year based on inflation adjustments. The state publishes updated brackets in early spring for the tax year you are filing. The lowest bracket starts at 1%, and each bracket above it increases incrementally until reaching the top rate of 5.8%.

Your bracket depends on your filing status — single, married filing jointly, married filing separately, or head of household. A married couple filing jointly will have higher income thresholds for each bracket than a single filer. You can find the exact 2024 brackets on the Idaho State Tax Commission website, which updates them annually.

What income Idaho taxes

Idaho taxes most forms of income. This includes W-2 wages from an employer, self-employment income from a business or freelance work, interest earned on savings accounts or bonds, and dividends from stocks or mutual funds. Capital gains (profit from selling an investment) are also taxable in Idaho.

Retirement distributions from IRAs and 401(k)s are taxable as ordinary income in the year you withdraw them. Social Security benefits may be partially taxable depending on your total income for the year. Some income types are exempt — for example, certain military pay and some disability benefits — but most earnings you receive will be subject to Idaho state tax.

Filing requirements and deadlines

You must file an Idaho state tax return if your income exceeds the threshold for your filing status. The threshold varies by age and filing status; generally, it is lower for people over 65. The Idaho State Tax Commission publishes the current thresholds each year.

Idaho state tax returns are due on the same date as your federal return — typically April 15. If you file for a federal extension, your Idaho return is also extended. You file using Form 40 (the main return) plus any schedules that apply to your situation, such as Schedule C for self-employment income or Schedule D for capital gains.

Deductions and credits available in Idaho

Idaho allows a standard deduction, which reduces your taxable income. The standard deduction amount depends on your filing status and age. You can also itemize deductions if your total itemized deductions exceed the standard deduction, though this is less common for most filers.

Idaho offers several tax credits that directly reduce the tax you owe. These include credits for dependents, education expenses, and property taxes paid. Some credits are refundable, meaning you can receive money back even if you owe no tax. The Idaho State Tax Commission website lists all available credits and the requirements for each.

How to file your Idaho state return

You can file your Idaho return on paper by mailing Form 40 and supporting schedules to the Idaho State Tax Commission, or you can file electronically through approved tax software or a tax professional. Electronic filing is faster and reduces errors — the state processes e-filed returns more quickly than paper returns.

If you use tax software, make sure it is certified to file Idaho returns. Many commercial tax software packages (such as TurboTax, H&R Block, and TaxAct) include Idaho filing. If you use a tax professional, they will handle filing on your behalf. The Idaho State Tax Commission also offers free filing options for lower-income residents through the Free File program.

Other Idaho taxes you may owe

In addition to income tax, Idaho has a sales tax of 6% statewide, though some counties add a local sales tax on top of that. Property owners pay property tax to their county assessor. Self-employed individuals owe self-employment tax (Social Security and Medicare) to the federal government, not to Idaho, but this affects your federal return.

Businesses may owe corporate income tax if they are structured as a corporation. Sole proprietors and partnerships report business income on their personal returns instead. Idaho does not have an estate tax or inheritance tax, so beneficiaries do not owe state tax on money or property they inherit.

Frequently Asked Questions

Do I have to pay Idaho income tax if I moved out of state?

No, not if you are no longer a resident. However, you may owe tax on income you earned while you were an Idaho resident during that tax year. If you moved mid-year, you file as a part-year resident and only pay tax on income earned before you left. You will need to report your move date to the Idaho State Tax Commission.

What counts as Idaho residency for tax purposes?

You are an Idaho resident for tax purposes if you live in the state for more than half the tax year, or if you maintain a permanent home there and spend significant time there. The Idaho State Tax Commission has specific rules for determining residency. If you are unsure, contact them directly — they can review your situation.

Can I deduct federal taxes paid from my Idaho return?

No. Idaho does not allow you to deduct federal income taxes paid. You can deduct state and local property taxes and sales taxes (up to a limit) if you itemize deductions, but not federal income tax.

What happens if I file late or owe taxes I cannot pay?

The Idaho State Tax Commission charges penalties and interest on late payments. If you cannot pay in full, you can request a payment plan. Contact the commission to discuss your options — they may be able to set up a monthly payment arrangement or temporarily delay collection while you arrange funds.

Where do I send my Idaho tax return?

Mail paper returns to the Idaho State Tax Commission at the address listed on Form 40. If you file electronically, the software or tax professional submits it directly to the state. The commission's website has the current mailing address and contact information for questions about your return.