Kentucky has a state income tax, and it applies to most types of earned and unearned income

Kentucky taxes wages, salaries, interest, dividends, and capital gains as ordinary income. The state does not have a separate capital gains tax — long-term gains are taxed at the same rates as short-term gains and wages. Kentucky's income tax is progressive, meaning the rate increases as your income rises. For the 2024 tax year, rates range from 2% on the lowest bracket to 5.85% on the highest, though these rates can change year to year and you should verify the current rates on the Kentucky Department of Revenue website before filing.

Unlike federal income tax, Kentucky income tax is not withheld automatically from most paychecks unless you work for a Kentucky employer and have completed a Kentucky W-4 form. If you are self-employed, a contractor, or receive income without withholding, you may owe estimated taxes quarterly. Kentucky also taxes retirement income differently depending on the source — some pensions and retirement account withdrawals receive preferential treatment, while others are taxed in full.

Key Takeaways

  • Kentucky's income tax rates range from 2% to 5.85% depending on your income level, and explore to wages, investment income, and most other sources of income.
  • Kentucky does not separate capital gains into a lower tax bracket — they are taxed as ordinary income at the same rates as wages.
  • Military pensions and some other retirement income receive partial or full exemptions from Kentucky income tax, but you must claim the exemption on your return.
  • If you are self-employed or receive income without withholding, you may need to pay estimated taxes to Kentucky quarterly to avoid penalties.
  • Kentucky uses federal taxable income as the starting point for state taxes, so changes to your federal return usually affect your state return as well.

How Kentucky's tax brackets work

Kentucky uses a progressive tax system with six income brackets. The lowest earners pay 2%, and each bracket above that increases the rate until you reach the top bracket at 5.85%. You do not pay the top rate on all your income — only the portion that falls into the highest bracket. For example, if you are single and earn $50,000, you do not pay 5.85% on the entire amount. Instead, you pay 2% on the first portion, then 3%, 4%, and so on, until the last dollars you earned are taxed at the rate for that bracket.

The income ranges for each bracket change slightly each year to account for inflation. The Kentucky Department of Revenue publishes updated brackets every January. Your filing status — single, married filing jointly, married filing separately, or head of household — determines which bracket your income falls into. A married couple filing jointly reaches higher brackets at higher income levels than a single filer, which is why filing status matters even when the tax rate itself does not change.

What income Kentucky taxes and what it does not

Kentucky taxes wages and salaries in full. It also taxes interest income, dividend income, and capital gains — whether short-term or long-term — at the same ordinary income rates. This is different from federal tax, where long-term capital gains receive preferential rates. If you sell a stock you held for more than a year and make a profit, Kentucky taxes that gain at your ordinary rate, not at a lower capital gains rate.

Kentucky does not tax Social Security benefits. It also exempts certain retirement income: military pensions are fully exempt, and some public employee pensions (including teacher and police pensions) receive partial exemptions. Private pension income and distributions from IRAs and 401(k)s are generally taxable, though some retirees over age 59½ may claim a limited retirement income exemption. You must claim these exemptions on your Kentucky return — they do not happen automatically.

Kentucky also does not tax income earned by residents while working in another state, provided you paid tax to that state. This is called a credit for taxes paid to other states, and it prevents you from being taxed twice on the same income. You claim this credit on your Kentucky return by reporting the out-of-state tax you paid.

Withholding and estimated taxes

If you work for a Kentucky employer, your employer should withhold Kentucky income tax from your paycheck if you have completed a Kentucky W-4 form (Form K-4). Many employees never fill out this form, which means no Kentucky tax is withheld, and they owe the full amount when they file. If you are a new employee or have never submitted a K-4, ask your payroll department for the form. You can also file it online through the Kentucky Department of Revenue website.

If you are self-employed, a contractor, or receive income from sources that do not withhold tax — such as rental income, freelance work, or investment income — you may need to pay estimated taxes quarterly. Kentucky requires estimated payments if you expect to owe $400 or more in state income tax for the year. Payments are due on April 15, June 15, September 15, and January 15. If you do not pay estimated taxes and owe a large amount at filing time, you may face penalties and interest.

How Kentucky income tax interacts with federal tax

Kentucky starts with your federal taxable income and makes adjustments from there. This means that if you claim a deduction on your federal return, it usually affects your Kentucky return as well. However, Kentucky does not allow all the deductions that the federal government does. For example, Kentucky does not allow a deduction for federal income tax paid, even though some states do. You should review the Kentucky Department of Revenue instructions for your filing status to see which federal deductions carry over and which do not.

If you make changes to your federal return after filing — such as amending it to claim a missed deduction or correct an error — you must also file an amended Kentucky return. Kentucky will not automatically update your state tax based on federal changes. The important date to amend a Kentucky return is generally three years from the original filing date or the date you paid the tax, whichever is later.

Filing requirements and important date

You must file a Kentucky income tax return if your income exceeds the threshold for your filing status. For 2024, the threshold is $2,900 for single filers and $5,800 for married couples filing jointly, though these amounts change annually. Even if you do not owe tax, you may want to file if you had Kentucky income tax withheld, because you could receive a refund.

Kentucky returns are due on the same date as federal returns: April 15 of the following year. If you file your federal return early, you can file your Kentucky return at the same time. 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 — if you owe tax, you should pay by April 15 to avoid interest and penalties, even if you have not filed yet.

Frequently Asked Questions

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

Yes, Kentucky taxes income earned within the state, regardless of where you live. However, you may be able to claim a credit for taxes paid to your home state to avoid double taxation. The rules vary by state, so you should report the income on both your Kentucky and home state returns and claim the appropriate credit on each.

Is my military pension exempt from Kentucky income tax?

Yes, military pensions are fully exempt from Kentucky income tax. You do not need to report them on your Kentucky return. However, you should still report them on your federal return, as the federal government taxes military pensions in full.

What happens if I do not have Kentucky income tax withheld from my paycheck?

You will owe the full amount of Kentucky income tax when you file your return in April. To avoid this, complete a Kentucky W-4 form and submit it to your payroll department. If you expect to owe a large amount, you can also make estimated tax payments throughout the year to spread out the cost.

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

No, Kentucky does not allow a deduction for federal income tax paid. You calculate your Kentucky tax based on your federal taxable income, but you cannot reduce that income further by the amount of federal tax you owe.

What is the important date to file my Kentucky return if I owe money?

The important date is April 15 of the following year, the same as the federal important date. If you owe tax and do not pay by that date, you will owe interest and penalties on the unpaid amount, even if you file an extension request.