Kentucky has a state income tax, and it applies to most wages and investment income

Kentucky taxes income at the state level. If you earn wages, receive investment income, or have self-employment earnings, Kentucky will take a cut. The state income tax rate is 5.75 percent on most types of income — one of the flatter tax structures in the country, meaning nearly everyone pays the same percentage regardless of how much they earn.

This is different from federal income tax, which is progressive (higher earners pay higher rates). Kentucky's flat rate means a person earning $30,000 and a person earning $300,000 both pay 5.75 percent to the state, though the federal government taxes them differently.

The tax applies to W-2 wages from an employer, 1099 self-employment income, interest, dividends, capital gains, and retirement distributions. Some income sources are exempt — for example, Social Security benefits are not taxed by Kentucky, and certain retirement income may may have access to for exclusions depending on your age and income level.

Key Takeaways

  • Kentucky's state income tax rate is a flat 5.75 percent on wages, self-employment income, and most investment income.
  • Social Security benefits are not subject to Kentucky state income tax, and residents age 59 and older may exclude some retirement income.
  • Your employer withholds Kentucky income tax from your paycheck if you work in the state, similar to federal withholding.
  • You file Kentucky taxes on Form 740 if you owe state tax or are due a refund, usually at the same time you file federal taxes.

How Kentucky withholds state income tax from your paycheck

When you start a job in Kentucky, your employer uses a W-4 form to determine how much state income tax to withhold from each paycheck. This is separate from federal withholding — you fill out one W-4 for both, but your employer calculates the Kentucky portion based on the state's rules.

The amount withheld depends on your filing status, the number of dependents you claim, and your gross pay. If you claim too many dependents or too much exemption, you may not have enough withheld and could owe money when you file. If you claim too few, you will overpay and receive a refund.

You can adjust your withholding at any time by submitting a new W-4 to your employer's payroll department. This is useful if your life changes — marriage, divorce, a second job, or a major raise — because it lets you correct the amount being taken out before tax time arrives.

Who does not pay Kentucky state income tax

Certain groups are exempt from Kentucky income tax entirely. Social Security recipients pay no state tax on those benefits, even if they have other income. This is a significant break for retirees living on Social Security alone or as their primary income source.

Military members stationed in Kentucky but domiciled in another state do not owe Kentucky tax on their military pay, as long as they maintain residency elsewhere. Federal employees and some other government workers may also have exemptions depending on the type of income.

Residents age 59 and older may exclude up to $41,110 of retirement income per year (as of the current tax year, though this amount can change). This includes distributions from IRAs, 401(k)s, pensions, and annuities. You must be at least 59½ to claim this exclusion, and you report it on your Kentucky tax return.

Filing your Kentucky state income tax return

If you owe Kentucky income tax or are due a refund, you file using Form 740, Kentucky's individual income tax return. You can file on paper by mailing it to the Kentucky Department of Revenue, or you can file electronically through the state's website or through tax software.

The important date is the same as the federal important date — typically April 15 of the year following the tax 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.

You will need your W-2s from all employers, 1099 forms for self-employment or investment income, and documentation of any deductions or credits you claim. Kentucky allows a standard deduction (which changes yearly) or itemized deductions, similar to federal filing.

Kentucky tax credits that reduce what you owe

Kentucky offers several tax credits that can lower your state income tax bill. The Earned Income Tax Credit (EITC) is available to low- and moderate-income workers and is based on your federal EITC — Kentucky's credit is a percentage of what you receive from the federal government.

The state also offers credits for child and dependent care expenses, education-related costs, and property taxes paid. Some credits are refundable, meaning if the credit is larger than your tax bill, you receive the difference as a refund. Others are non-refundable, meaning they can only reduce your tax to zero.

To claim these credits, you list them on your Form 740 return. You will need documentation such as receipts, invoices, or statements showing the expenses you incurred. The Kentucky Department of Revenue website lists all available credits and the forms required for each.

What happens if you move to or from Kentucky

If you move to Kentucky during the tax year, you owe Kentucky income tax only on the income you earned after you became a resident. You file as a part-year resident and report income earned in Kentucky separately from income earned in your previous state.

If you move out of Kentucky, you owe Kentucky tax only on income earned while you were a resident. Once you establish residency in another state, Kentucky has no claim on your future income. You will file a part-year return for the year you moved.

Residency is typically determined by where you maintain a permanent home and where you spend most of your time. If you work in Kentucky but live in another state, you may owe tax to both states, though you can usually claim a credit on one return to avoid double taxation.

Self-employed workers and Kentucky income tax

If you are self-employed, you owe Kentucky income tax on your net business income at the same 5.75 percent rate as wage earners. You calculate your net income by subtracting business expenses from gross revenue, then pay tax on that amount.

You do not have an employer withholding taxes for you, so you may need to make estimated tax payments to Kentucky four times per year (quarterly). These payments are due in April, June, September, and January. If you do not pay enough through estimates, you may owe a penalty when you file your annual return.

You report self-employment income on Schedule C (federal) and then transfer that figure to your Kentucky Form 740. You can deduct business expenses such as supplies, equipment, home office costs, and vehicle mileage, which reduces your taxable income.

Frequently Asked Questions

Does Kentucky tax retirement income like pensions and 401(k) withdrawals?

Kentucky taxes most retirement income, but residents age 59½ and older can exclude up to $41,110 per year from IRAs, 401(k)s, pensions, and annuities. Social Security is never taxed by Kentucky. If you are under 59½, you pay the full 5.75 percent on retirement distributions.

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

Kentucky income tax is a flat 5.75 percent, while federal income tax uses brackets that increase with income. You file both at the same time, but they are calculated separately. Your employer withholds both from your paycheck, and you report both on your annual tax return.

Can I get a refund if too much Kentucky tax was withheld?

Yes. If your employer withheld more than you owe, you receive a refund when you file your Form 740 return. The refund is mailed to you or deposited directly to your bank account if you choose direct deposit. Refunds typically arrive within four to six weeks of filing.

Do I have to file a Kentucky return if I only earned a small amount?

You must file if your income exceeds the filing threshold for your filing status, which changes yearly. Even if you do not owe tax, filing may result in a refund if you had taxes withheld. Check the Kentucky Department of Revenue website for the current year's threshold.

What if I worked in Kentucky but lived in another state?

You owe Kentucky income tax on wages earned in Kentucky, even if you lived elsewhere. You file a part-year return in both Kentucky and your home state. Most states offer a credit to prevent double taxation, so you will not pay the full rate to both.