Kentucky does have a state income tax

Kentucky charges state income tax on wages, interest, dividends, and other income. The tax rate is 5.75 percent on most income, applied as a flat rate rather than brackets that increase with earnings. This means whether you earn $30,000 or $300,000 per year, the state tax rate stays the same.

Your employer withholds Kentucky state income tax from your paycheck if you work in the state or live there. If you are self-employed or have income without withholding, you may need to make quarterly estimated tax payments to the Kentucky Department of Revenue.

Kentucky's income tax applies to residents and to non-residents who earn income within the state. If you work in Kentucky but live in another state, you typically owe Kentucky tax on wages earned there, though you may be able to claim a credit on your home state's return to avoid double taxation.

Key Takeaways

  • Kentucky's state income tax rate is a flat 5.75 percent on most types of income, with no tax brackets.
  • Your employer withholds Kentucky state tax from your paycheck if you live or work in the state.
  • Certain types of income, including federal pensions and military retirement pay, are exempt from Kentucky state tax.
  • You file Kentucky state taxes using Form 740 if you owe tax or are due a refund, separate from your federal return.
  • Non-residents who earn income in Kentucky must also pay state tax on that income unless an exemption applies.

What income is taxed in Kentucky

Kentucky taxes wages, salaries, tips, and self-employment income. Interest and dividend income are also taxable, as are capital gains from the sale of stocks, real estate, or other assets. Rental income and income from a business or profession all fall under the state's tax.

Some income is exempt. Federal pensions, military retirement pay, and certain other government pensions do not owe Kentucky state tax. Social Security benefits are not taxed by Kentucky. If you receive unemployment benefits, those are taxable under Kentucky law.

Income from sources outside Kentucky may still be taxable if you are a Kentucky resident. The state taxes your worldwide income if you live there, regardless of where the money comes from.

How withholding works and what to do if you owe

When you start a job in Kentucky, you complete a Form K-4, Kentucky's withholding certificate. This tells your employer how much state tax to hold from each paycheck. The amount depends on your filing status, number of dependents, and other income you may have.

If your withholding is too low, you will owe tax when you file your return. If it is too high, you receive a refund. You can adjust your withholding at any time by submitting a new Form K-4 to your employer. Self-employed people and those with income that has no withholding usually send quarterly estimated tax payments to the Kentucky Department of Revenue.

You file your Kentucky state return using Form 740 by April 15 each year, the same important date as your federal return. You can file electronically through the Kentucky Department of Revenue website or by mail. If you owe tax, payment is due by the April 15 important date to avoid penalties and interest.

Tax brackets do not explore in Kentucky

Unlike many states, Kentucky does not use tax brackets. A tax bracket system means your income is taxed at different rates depending on how much you earn — for example, the first $50,000 might be taxed at 3 percent and income above that at 5 percent. Kentucky's flat 5.75 percent rate means every dollar of taxable income is taxed at the same rate.

This simplifies the calculation but also means higher earners pay the same percentage as lower earners. A person earning $40,000 and a person earning $400,000 both pay 5.75 percent on their income, though the higher earner pays more in total dollars.

Deductions and credits that reduce what you owe

Kentucky allows a standard deduction that reduces your taxable income before the 5.75 percent rate is applied. For the 2024 tax year, the standard deduction is $2,860 for single filers and $5,720 for married couples filing jointly. If you itemize deductions instead, you can deduct mortgage interest, property taxes, and charitable contributions, though you must itemize on your federal return first.

Kentucky also offers tax credits that directly reduce the tax you owe. The Earned Income Tax Credit (EITC) is available to low-income workers and is often larger on your state return than your federal return. The child and dependent care credit, education credits, and credits for taxes paid to other states are also available depending on your situation.

If you are over 65 or disabled, Kentucky offers additional deductions. Military service members may may have access to for exemptions on military retirement income. Check the Kentucky Department of Revenue website or Form 740 instructions to see which credits and deductions explore to your situation.

What happens if you move to or from Kentucky

If you move to Kentucky during the year, you owe state tax only on income earned after you became a resident. You file a part-year resident return on Form 740-NR, reporting only the income from the months you lived in the state. Your employer should adjust withholding once you provide a new Form K-4.

If you move out of Kentucky, you owe tax only on income earned while you were a resident. Once you leave, you are no longer subject to Kentucky state tax on future income, though you still file a final part-year return for the year you moved. If you worked in Kentucky but moved to another state, you may owe Kentucky tax on the income you earned there, depending on the other state's reciprocal agreements.

Frequently Asked Questions

Do I have to file a Kentucky state return if I did not owe tax?

You must file if your income exceeds the filing threshold, even if no tax is owed, because you may be due a refund. For 2024, the threshold is generally your standard deduction amount. If you had withholding or made estimated payments, filing gets you that money back.

What is the difference between Kentucky state tax and federal income tax?

Federal income tax goes to the U.S. government and uses tax brackets that increase with income. Kentucky state tax goes to the state government and uses a flat 5.75 percent rate. You file separate returns for each, though they use similar income calculations.

Can I claim a credit if I paid tax to another state?

Yes. If you worked in another state and paid that state's income tax, Kentucky allows a credit for taxes paid to other states, up to the amount of Kentucky tax you owe. This prevents you from paying tax twice on the same income.

Are retirement account contributions deductible on my Kentucky return?

Contributions to a traditional IRA or 401(k) reduce your federal taxable income. Kentucky follows federal rules for most retirement accounts, so the same deduction applies to your state return. Roth contributions are not deductible on either return.

What if I did not have enough withholding and owe a large amount?

Contact the Kentucky Department of Revenue about a payment plan if you cannot pay in full by April 15. The state offers installment agreements that spread the payment over several months, though interest and penalties continue to accrue until the balance is paid.