Kentucky does have a state income tax
Kentucky charges state income tax on wages, salaries, and most other income. The tax rate is a flat 5 percent on your federal taxable income, meaning everyone pays the same percentage regardless of how much you earn. This is different from the federal system, which uses tax brackets that increase with income.
The state collects this tax through withholding from paychecks, quarterly estimated payments if you're self-employed, and annual returns filed with the Kentucky Department of Revenue. If you work in Kentucky or live there, you will owe state income tax unless you fall into one of the narrow categories of people who don't.
Key Takeaways
- Kentucky's state income tax rate is a flat 5 percent on federal taxable income for all residents and most workers.
- Retirement income, including Social Security and some pension payments, is exempt from Kentucky state income tax.
- If you work in Kentucky but live in another state, you may owe Kentucky tax on wages earned in the state, though your home state may also claim tax.
- You file Kentucky state taxes using Form 740 or 740-NP, separate from your federal return, usually by the same April deadline.
Who has to pay Kentucky income tax
You owe Kentucky state income tax if you are a resident of Kentucky or if you earned income in Kentucky during the tax year. Residency is determined by where you lived for more than 183 days in the year, though the state also considers factors like where you own property, where your family lives, and where you maintain a permanent home.
Non-residents who worked in Kentucky owe tax only on the income they earned in the state. If you lived in Kentucky for part of the year and moved, you file as a part-year resident and pay tax only on income earned while you were a Kentucky resident.
If you are a Kentucky resident, you owe tax on all income from all sources — wages, self-employment, rental income, investment income — unless that specific type of income is exempt.
Income that is exempt from Kentucky tax
Social Security benefits are completely exempt from Kentucky state income tax. This applies to all Social Security payments, whether you receive them as a retiree, survivor, or disabled worker. You do not report Social Security on your Kentucky return.
Retirement income from pensions and annuities is also exempt, but only if you were at least 55 years old when you first received the payments. If you started receiving pension payments before age 55, those payments remain taxable in Kentucky. Military pensions are fully exempt regardless of your age.
Certain other income sources do not count as taxable income in Kentucky: workers' compensation, unemployment benefits, gifts, inheritances, and life insurance proceeds. Interest and dividends from investments are taxable, as are capital gains.
How Kentucky income tax withholding works
Your employer withholds Kentucky income tax from your paycheck based on the information you provide on Form K-4, Kentucky's withholding certificate. This form asks about your filing status, number of dependents, and other adjustments. You complete it when you start a job and can update it if your situation changes.
The amount withheld is calculated as 5 percent of your federal taxable wages after standard deductions and adjustments. If you have multiple jobs, you may need to adjust your withholding on one or both forms to avoid owing money at tax time or receiving a large refund.
If you are self-employed, you do not have an employer to withhold tax. Instead, you pay estimated tax quarterly using Form 765-ES. Payments are due April 15, June 15, September 15, and January 15 of the following year. If you do not pay enough throughout the year, you will owe the balance when you file your return.
Filing your Kentucky state tax return
Most Kentucky residents file Form 740, the state income tax return. If you have no tax to report — for example, if your only income is exempt Social Security — you may file Form 740-NP instead, which is simpler. Both forms are due by April 15 unless you request an extension.
You can file by mail, by phone using an automated system, or online through the Kentucky Department of Revenue website. Many tax software programs include Kentucky forms and will calculate your state tax when you enter your federal information. If you use a tax preparer, they will handle the state return as part of your overall filing.
When you file, you report your income from all sources, claim any deductions or credits you are may have access to to, and calculate the tax owed. The state compares this to what was withheld during the year. If more was withheld than you owe, you receive a refund. If less was withheld, you pay the difference.
What happens if you work in Kentucky but live elsewhere
If you live in another state but earned wages in Kentucky, you owe Kentucky income tax on those wages. You file a Kentucky return reporting only the income earned in the state. Your home state may also tax the same income, but most states have reciprocal agreements or allow credits to prevent double taxation.
Some states bordering Kentucky — Indiana, Ohio, and West Virginia — have reciprocal agreements that may exempt you from Kentucky tax if you live there and work in Kentucky. You would need to file a certificate of non-residence with your Kentucky employer to stop withholding. Check with your state's tax authority to see if such an agreement applies to you.
If you are a Kentucky resident who worked in another state, you owe Kentucky tax on all your income, including what you earned out of state. Your Kentucky return will include a credit for taxes paid to the other state, which reduces what you owe Kentucky.
Deductions and credits available in Kentucky
Kentucky allows a standard deduction that reduces your taxable income before the 5 percent tax is applied. The standard deduction amount depends on your filing status and age. For the 2024 tax year, the standard deduction ranges from $2,860 for a single filer under 65 to $4,290 for a married couple filing jointly where both are 65 or older. These amounts change each year.
You can also claim a dependent exemption for each may have access to child or dependent. The exemption amount is set by the state and reduces your taxable income further. If you itemize deductions on your federal return instead of taking the standard deduction, you cannot itemize on your Kentucky return — you must use the Kentucky standard deduction.
Kentucky offers several tax credits that directly reduce the tax you owe, including credits for child and dependent care expenses, education expenses, and property tax paid. These credits are claimed on your return and can result in a refund if the credit exceeds your tax liability.
Frequently Asked Questions
Do I have to file a Kentucky return if I only received Social Security?
No. If Social Security is your only income, you have no Kentucky tax to report and do not need to file. However, if you had other taxable income during the year, you must file a return reporting that income even if Social Security was also received.
What if I moved to Kentucky partway through the year?
You file as a part-year resident and report only the income you earned after you moved to Kentucky. You will need to show proof of your move date, such as a lease or utility bill. Income earned before you moved is reported to your previous state.
Can I claim my children as dependents on my Kentucky return if I claim them on my federal return?
Yes. If you claim a dependent on your federal return, you can claim the same dependent on your Kentucky return. The dependent must meet Kentucky's definition, which is generally the same as the federal definition.
What if my employer did not withhold Kentucky tax?
When you file your return, you will owe the full 5 percent tax on your Kentucky income plus any penalties and interest for underpayment. You should update your Form K-4 immediately to ensure withholding begins. If the employer was required to withhold and did not, you may also contact the Kentucky Department of Revenue.
Is there a way to reduce my Kentucky income tax?
You can reduce your tax by claiming all deductions and credits you are may have access to to, such as the standard deduction, dependent exemptions, and education or child care credits. Contributing to a traditional IRA or 401(k) also reduces your federal taxable income, which in turn reduces your Kentucky taxable income since Kentucky uses federal taxable income as its starting point.