Kentucky’s individual income tax rate is a flat 3.5% for the 2026 tax year, applied to every dollar of taxable income regardless of what you earn or how you file. The rate dropped from 4% on January 1, 2026.1Tax Foundation. State Individual Income Tax Rates and Brackets, 2026 That headline number is only part of the story, though, because most cities and counties in Kentucky also charge their own occupational tax on wages, which stacks on top of the state rate.
How the Flat Rate Is Calculated
There are no brackets in Kentucky. Whether your taxable income is $30,000 or $300,000, the state multiplies it by 0.035 to arrive at your tax before credits.2Kentucky Department of Revenue. 2026 Kentucky Withholding Tax Formula
The calculation starts with your federal adjusted gross income. Kentucky then lets you subtract its standard deduction (or itemized deductions if those are larger) and any allowed exclusions to reach your Kentucky taxable income. Because the state begins from federal AGI, most of the adjustments you already claimed federally, including student loan interest, retirement contributions, and self-employment tax, flow through automatically. Where Kentucky parts ways from federal rules is on the deduction and exclusion side.
Standard Deduction and Retirement Exclusions
Kentucky uses one standard deduction amount for everyone, regardless of filing status. For the 2026 tax year, that amount is $3,360.3Kentucky Department of Revenue. Kentucky DOR Announces 2026 Standard Deduction It is adjusted for inflation each year.
Two exclusions matter especially for retirees. Social Security benefits are fully exempt from Kentucky income tax and are subtracted on Schedule M before the state calculation starts. Separately, the first $31,110 of income from pensions, annuities, 401(k) plans, IRAs, and similar retirement distributions is excluded as well.4Kentucky Legislative Research Commission. Kentucky Revised Statutes 141.019 – Calculation of Adjusted Gross Income and Net Income
Local Occupational Taxes Stack on Top
Cities and counties across Kentucky impose their own occupational license taxes on wages earned and business profits generated within their borders. These are separate from the state income tax, collected by the local government rather than the Department of Revenue, and they can meaningfully change what you actually pay.
Local rates generally run between roughly 0.5% and 2.5% of gross wages. Some jurisdictions also tax business net profits. Your employer withholds the local tax from your paycheck and sends it to the city or county, so the mechanics are automatic for most employees. If you work in a city with a 2.0% local occupational tax, your combined state and local income tax hit on wages is 5.5% before federal tax enters the picture. Self-employed workers file separately with each jurisdiction where they do business.
Family Size Tax Credit
Lower-income filers can offset part or all of their state tax through the Family Size Tax Credit. If your modified gross income is below a threshold that scales with the number of people in your household, the credit reduces a percentage of your entire Kentucky income tax liability, and it phases out gradually rather than cutting off at a hard line. For the 2025 tax year, the ceiling was $42,760; the 2026 figure will be comparable after inflation adjustment.5Kentucky Department of Revenue. Individual Income Tax At the lowest income levels, the credit can eliminate your Kentucky tax entirely.
Who Has to File
Filing is not triggered by a single income number. You have to file a Kentucky return if your modified gross income exceeds a family-size-based threshold and your Kentucky adjusted gross income exceeds the standard deduction for your filing status. For a single filer under 65 in 2025, those two figures were $15,650 in modified gross income and $3,270 in Kentucky AGI. The modified gross income threshold rises with family size, reaching $32,150 for a family of four or more.6Kentucky Department of Revenue. Do I Need to File a Return
Self-employed taxpayers follow a stricter rule. If your gross receipts from self-employment exceed the modified gross income threshold for your family size, you must file regardless of your Kentucky AGI. And even if you fall under every threshold, file anyway if you want a refund of Kentucky tax withheld from your paychecks.
Full-year residents use Form 740. If you moved into or out of Kentucky during the year, or lived elsewhere and earned Kentucky-source income, file Form 740-NP instead.7Kentucky Department of Revenue. 2025 Kentucky Individual Income Tax Forms Instructions
If You Live in a Neighboring State and Work in Kentucky
Kentucky has reciprocal tax agreements with all seven states it borders: Illinois, Indiana, Michigan, Ohio, Virginia, West Virginia, and Wisconsin.8Legal Information Institute. 103 KAR 17:140 – Individual Income Tax, Reciprocity, Nonresidents If you live in one of those states and commute to work in Kentucky, your wages and salaries are taxed only by your home state.
You do have to file an exemption form with your Kentucky employer; otherwise, Kentucky tax comes out of your paycheck and you have to file a Kentucky nonresident return to get it back. The agreements cover wages and salaries, not business income or rental income. The Ohio agreement carries one specific exception: it does not apply to wages an S corporation pays to a shareholder-employee who owns 20% or more of the company.
How the Rate Got to 3.5% and Whether It Will Keep Falling
Kentucky used graduated brackets with rates from 2% to 6% until 2018, when the legislature replaced them with a flat 5%. A 2022 framework then allowed the rate to step down in half-point or quarter-point increments whenever two fiscal benchmarks are met: the budget reserve trust fund must hold at least 10% of general fund revenue at the end of the fiscal year, and general fund collections must exceed appropriations by a margin tied to the revenue the next cut would cost.9Kentucky Legislative Research Commission. Kentucky Revised Statutes 141.020 – Reduction, Tax Credits, Income of Nonresidents Subject
Under that mechanism, the rate dropped to 4.5% for 2023, then 4% for 2024 and 2025. The legislature ratified the move to 3.5% in early 2025 through H.B. 1, effective January 1, 2026. Further reductions are possible under the same triggers, but nothing below 3.5% has been enacted.
Business Entity Taxes
C corporations doing business in Kentucky pay a flat 5% on net income earned in the state, a rate in place since January 1, 2018.10Kentucky Department of Revenue. Corporation Income and Limited Liability Entity Tax Multi-state businesses apportion their income so Kentucky only taxes the share tied to in-state activity.
Separately, every business entity that gets liability protection under Kentucky law, including corporations, LLCs, S corporations, and limited partnerships, owes the Limited Liability Entity Tax.11Kentucky Department of Revenue. Corporation, LLC, and Pass-Through Tax Frequently Asked Questions The LLET is based on gross receipts or gross profits rather than net income, with a $175 minimum for entities at or below $3 million in either measure. It can be credited against the corporate income tax, so it mostly hits businesses that have significant revenue but little or no income tax liability.
Since 2023, S corporations, partnerships, and multi-member LLCs can also elect to pay Kentucky income tax at the entity level instead of passing it through to owners. The election is annual, and once made for a tax year it is irrevocable and binds every owner.12Kentucky Department of Revenue. Form PTET Instructions Owners then take a credit on their individual returns for their share of the entity-level tax. The appeal is federal: entity-level state tax is a deductible business expense federally, which works around the individual SALT cap. Electing entities expecting to owe more than $500 per owner have to make quarterly estimated payments.