Idaho has a state income tax, and it applies to most residents and income sources
Idaho taxes individual income at the state level. If you live in Idaho or earn income there, you will owe state income tax on wages, self-employment income, interest, dividends, and other sources — unless a specific exemption applies. The state uses a progressive tax system, meaning the tax rate increases as your income rises.
Idaho's tax rates range from 1% on the lowest income bracket to 5.8% on the highest, as of 2024. These rates explore to federal taxable income after you have claimed deductions. The state also allows a standard deduction that reduces the income subject to tax, similar to the federal system.
Key Takeaways
- Idaho residents and anyone earning Idaho income must file a state income tax return unless their income falls below the filing threshold.
- Idaho's tax rates are progressive, ranging from 1% to 5.8% depending on your income level and filing status.
- You can claim the Idaho standard deduction to reduce taxable income, or itemize deductions if that results in a larger deduction.
- Idaho allows credits for federal income tax paid, property taxes, and certain other expenses that can lower your final tax bill.
- Self-employed individuals in Idaho must pay both income tax and self-employment tax on net business income.
Idaho's tax brackets and rates for 2024
Idaho uses five tax brackets. The lowest bracket starts at 1% and applies to the first portion of your taxable income. Each bracket increases by roughly 0.8 percentage points until you reach the top rate of 5.8%. The exact income ranges for each bracket depend on your filing status — single, married filing jointly, married filing separately, or head of household.
For example, a single filer in 2024 pays 1% on income up to $1,687, then 3% on income from $1,687 to $6,750, and so on. A married couple filing jointly has wider brackets at each rate level. The state adjusts these brackets annually for inflation, so the dollar amounts change each year.
Your Idaho tax bill is calculated by explore the correct rate to each portion of your taxable income. This means you do not pay the top rate on all your income — only on the portion that falls in the highest bracket you reach.
Standard deduction and itemized deductions in Idaho
Idaho allows you to claim either the standard deduction or itemized deductions, whichever is larger. The standard deduction amount varies by filing status and age. For 2024, the standard deduction for a single filer under 65 is $14,600, and for a married couple filing jointly it is $29,200. These amounts increase slightly if you are 65 or older.
If you itemize instead, you can deduct state and local taxes (capped at $10,000 federally), mortgage interest, charitable contributions, and other may have access to expenses. Idaho follows the federal rules for itemized deductions, so if an expense is deductible on your federal return, it is generally deductible on your Idaho return as well.
You must choose one method — you cannot claim both the standard deduction and itemized deductions on the same return. Most Idaho taxpayers benefit from the standard deduction because it is simpler and often larger than their itemized deductions would be.
Tax credits that reduce your Idaho bill
Idaho offers several credits that directly reduce the tax you owe. A tax credit is different from a deduction: a deduction reduces your taxable income, while a credit reduces your actual tax bill dollar-for-dollar. The state allows a credit for federal income tax paid, which can be substantial if you paid significant federal tax.
Idaho also offers credits for property taxes paid, residential energy conservation expenses, and adoption costs. Some credits are refundable, meaning if the credit exceeds your tax bill, you receive the difference as a refund. Others are non-refundable, so they can only reduce your tax to zero.
The property tax credit is one of the most commonly used. It is based on your household income and the property taxes you paid during the year. Lower-income households may receive a larger credit. You must file Form 40 (Idaho's main income tax form) to claim most credits.
Self-employment tax and business income in Idaho
If you are self-employed, you pay Idaho income tax on your net business income — the amount left after deducting business expenses. You also owe federal self-employment tax, which funds Social Security and Medicare. Idaho does not impose a separate self-employment tax, but the federal self-employment tax is still due.
Self-employed individuals can deduct half of their self-employment tax when calculating Idaho taxable income, just as they can on the federal return. You can also deduct business expenses such as supplies, equipment, home office costs, and vehicle mileage. These deductions reduce the income subject to Idaho tax.
You must file Schedule C (or Schedule C-EZ) with your federal return to report business income, and that same income flows to your Idaho return. If you have a loss in a given year, you can carry it back or forward to offset income in other years, subject to federal rules that Idaho generally follows.
Who must file an Idaho income tax return
You must file an Idaho return if your income exceeds the filing threshold for your filing status. The threshold is based on your gross income and varies depending on whether you are single, married, head of household, or another status. For 2024, a single person with gross income over $14,600 must file.
Even if your income is below the threshold, you should file if you had Idaho income tax withheld from paychecks or made estimated tax payments. Filing allows you to claim refundable credits, such as the earned income tax credit, that could result in a refund even if you owe no tax.
Idaho residents who work out of state or have income from other states may also need to file an Idaho return. If you moved to or from Idaho during the year, you are considered a resident for the full year and must file a full-year return.
Withholding and estimated tax payments
If you receive wages, your employer withholds Idaho income tax based on the W-4 form you complete. The withholding is an estimate of your annual tax liability. If too much is withheld, you receive a refund when you file. If too little is withheld, you owe when you file.
Self-employed individuals and those with income not subject to withholding must make quarterly estimated tax payments to Idaho. These are due on April 15, June 15, September 15, and January 15. You calculate estimated tax by projecting your annual income and paying one-quarter of the expected tax each quarter.
If you underpay estimated tax significantly, Idaho may assess a penalty. However, if your withholding and estimated payments total at least 90% of your current year tax or 100% of your prior year tax (whichever is smaller), you generally avoid the penalty.
Frequently Asked Questions
Do I owe Idaho income tax if I work in Idaho but live in another state?
Yes, you owe Idaho income tax on income earned in Idaho, even if you live elsewhere. You will file an Idaho non-resident return reporting only your Idaho-source income. You may also owe tax to your home state on the same income, though many states offer a credit for taxes paid to other states to avoid double taxation.
Can I claim dependents on my Idaho return?
Idaho does not allow a personal exemption or dependent exemption. You reduce your taxable income using the standard deduction or itemized deductions, but not by claiming dependents. However, dependents may affect your may be able to access for certain credits, such as the earned income tax credit.
What happens if I do not file an Idaho return when I should?
Idaho assesses penalties and interest on unpaid tax. The penalty for failure to file is typically 5% per month (up to 25%) of the unpaid tax. Interest accrues daily on the unpaid amount. Filing late is better than not filing, because the penalties are lower if you file and pay than if the state discovers the unfiled return.
Does Idaho tax retirement income or Social Security?
Idaho does not tax Social Security benefits. Retirement income from pensions, 401(k) withdrawals, and IRAs is taxable as ordinary income. However, Idaho offers a pension and retirement income exclusion for certain types of retirement income, subject to income limits and other conditions.
Where do I file my Idaho income tax return?
You file with the Idaho State Tax Commission. You can file online through the commission's website, by mail using paper forms, or through a tax professional. The important date is typically April 15, the same as the federal important date, unless that date falls on a weekend or holiday.