Idaho does have a state income tax

Idaho charges a state income tax on wages, investment income, and other earnings. The tax rate depends on your total income for the year and ranges from 1% on the lowest bracket to 5.8% on the highest. Unlike some states, Idaho does not have a flat tax — the rate increases as your income increases.

Idaho also taxes capital gains, retirement account withdrawals, and certain types of business income. Social Security benefits are not taxed by the state, and some retirement income may may have access to for partial exemptions depending on your age and income level.

Key Takeaways

  • Idaho's state income tax ranges from 1% to 5.8% depending on your income bracket for the tax year.
  • The state taxes wages, investment income, and most forms of business income, but not Social Security benefits.
  • Idaho residents age 62 and older may be able to exclude some retirement income from state taxation under specific conditions.
  • You file Idaho state taxes using Form 40, which is separate from your federal return, usually by April 15 each year.

How Idaho's tax brackets work

Idaho uses a progressive tax system, meaning you pay different rates on different portions of your income. The state divides income into brackets, and you only pay the higher rate on income that falls within that bracket, not on all your income.

For the 2024 tax year, Idaho has six tax brackets. The lowest bracket starts at 1% for income under a certain threshold, and each bracket above it increases the rate slightly until you reach the top rate of 5.8%. The exact dollar amounts for each bracket change yearly based on inflation adjustments. You can find the current brackets on the Idaho State Tax Commission website or in the instructions that come with Form 40.

Your filing status — single, married filing jointly, married filing separately, or head of household — determines which bracket thresholds explore to you. A married couple filing jointly typically reaches higher income thresholds before hitting the top rate than a single filer with the same total income.

What income Idaho taxes and what it doesn't

Idaho taxes most types of income you receive during the year. This includes wages from employment, self-employment income, interest and dividends, rental income, and capital gains from selling investments or property. If you receive a 1099 form from an employer or financial institution, that income is almost certainly taxable in Idaho.

Social Security retirement benefits are not subject to Idaho state income tax, even if they are taxable at the federal level. Military pensions and some other government pensions may also be exempt or partially exempt. Residents age 62 and older may exclude up to $35,000 of retirement income per year under Idaho's retirement income exemption, though this has specific requirements about the source of the income and your adjusted gross income.

Certain types of income are also excluded: gifts, inheritances, life insurance proceeds, and workers' compensation are generally not taxed. If you are unsure whether a specific income source is taxable, the Idaho State Tax Commission publishes guidance on their website, or you can contact them directly.

Filing requirements and important date

You must file an Idaho state income tax return if your income exceeds a certain threshold for your filing status. For 2024, most single filers need to file if they earned more than $14,600, though this amount changes yearly. If you are married filing jointly, the threshold is higher. Even if you do not meet the filing requirement, you may want to file anyway if taxes were withheld from your paychecks, because filing allows you to get a refund.

Idaho uses Form 40 as its main individual income tax return. You file it by April 15 of the following year, the same important date as your federal return. If you need more time, you can request an extension, which gives you until October 15 to file. An extension to file is not an extension to pay — you still owe any taxes due by April 15, or you will face penalties and interest.

You can file by mail, online through the Idaho State Tax Commission website, or through a tax professional. If you file electronically, you typically receive a refund faster than if you mail a paper return.

Deductions and credits available to Idaho residents

Idaho allows you to reduce your taxable income through deductions. You can choose either the standard deduction — a fixed amount based on your filing status — or itemize deductions if your may be able to access expenses exceed the standard amount. For 2024, the standard deduction for a single filer is $15,000, and for married filing jointly it is $30,000, though these amounts increase yearly.

Idaho also offers tax credits that directly reduce the amount of tax you owe. These include credits for dependent children, education expenses, and property taxes paid. Some credits are refundable, meaning you can receive money back even if you owe no tax; others only reduce your tax bill to zero. The Idaho State Tax Commission website lists all available credits and the requirements for each.

How to file your Idaho state return

Start by gathering documents: your W-2 forms from employers, 1099 forms for other income, receipts for deductible expenses if you itemize, and last year's return if you filed one. You will also need your Social Security number and your spouse's if filing jointly.

read Form 40 and the instruction booklet from the Idaho State Tax Commission website, or request them by mail. The booklet walks you through each line of the form and includes worksheets for calculating deductions and credits. If your situation is straightforward — you have only W-2 income and take the standard deduction — the form is relatively straightforward to complete by hand.

If your income is more complex, you have multiple income sources, or you want professional help, you can use tax software or hire a tax preparer. Many tax preparers in Idaho are familiar with state returns and can file both your state and federal returns together. Some community organizations also offer free tax preparation services to lower-income residents.

Frequently Asked Questions

Do I have to pay Idaho income tax if I work in Idaho but live in another state?

You typically owe Idaho income tax on income you earned in Idaho, even if you live elsewhere. However, your home state may also tax that same income. Most states have agreements to prevent double taxation, so you usually get a credit on your home state return for taxes paid to Idaho. Check with both states' tax commissions to understand your specific situation.

What happens if I don't file or pay my Idaho taxes on time?

The Idaho State Tax Commission charges penalties and interest on unpaid taxes. Penalties start at 5% of the unpaid amount and can increase if the return is significantly late. Interest accrues daily at a rate set by the state. If you cannot pay by the important date, filing an extension request and paying what you can reduces the penalties.

Can I deduct federal income taxes paid from my Idaho state return?

No, Idaho does not allow a deduction for federal income taxes paid. You can deduct state and local property taxes, sales taxes (if you choose not to deduct income taxes), and some other expenses, but not federal taxes.

Is there a way to reduce my Idaho income tax if I'm retired?

If you are age 62 or older, you may be able to exclude up to $35,000 of retirement income per year, depending on the source of the income and your adjusted gross income. may have access to income includes pensions, annuities, and distributions from retirement accounts. Social Security is already exempt. Contact the Idaho State Tax Commission or a tax preparer to see if you may have access to.