Kentucky State Income Tax Guide (2026)

Kentucky's flat state rate has been on a steady phase-down: 5% in 2022, 4.5% in 2023, 4% from 2024 onward. HB 8 (2022) wrote the framework — if General Fund revenue growth exceeds 1% above the prior-year cap and the budget reserve sits above 10% of receipts, the legislature can cut the rate by another 0.5 percentage points. The 2024-to-2025 revenue data appears to have cleared the trigger again, putting 3.5% on the table for tax year 2027 if the General Assembly ratifies in the 2026 session. Worth tracking, not yet bankable.

The state rate is only half the story for most KY workers. Cities and counties levy occupational license taxes — wage taxes on income earned in the jurisdiction, regardless of where the worker lives. Major rates: Louisville/Jefferson County 2.2% combined (1.45% Louisville Metro + 0.75% Jefferson County Public Schools), Lexington-Fayette 2.25%, Bowling Green 1.85%, Florence 2.0%, Owensboro 1.78%, Northern Kentucky counties Boone 0.8% / Kenton 0.7097% / Campbell 1.05%. Many smaller and rural counties levy nothing.

The two layers stack. A Louisville Norton Healthcare nurse earning $80K pays 4% KY state on $76,730 of taxable income (~$3,070) AND 2.2% Louisville Metro on the full $80K (~$1,760), for ~$4,830 combined state-and-local on wages. The local tax doesn't credit against the state tax — they're separate jurisdictions, separate withholding, separate filings (the local tax is collected by employer and remitted; you usually don't file a separate return). And you owe the local tax even if you live two counties away — it's the location of work, not residency. This is the KY tax mechanic that out-of-state movers miss.

Kentucky has reciprocity with seven neighboring states — IL, IN, MI, OH, VA, WV, WI — the broadest reciprocity network in the country. A KY resident working in Cincinnati or Evansville owes only KY income tax on those wages. An OH or IN resident working in Louisville or Northern Kentucky owes only their home state's tax. You file a non-residence certificate with your employer (KY Form 42A809 for incoming workers; the equivalent in the other state for KY residents) and skip the second-state filing entirely. Saves a return, saves the credit math, saves the headache.

Northern Kentucky is the largest cross-border story. Hundreds of thousands of workers move daily between OH and KY across the Ohio River bridges. KY residents in Boone, Kenton, and Campbell counties working in Cincinnati pay KY 4% state (no OH state) + Boone/Kenton/Campbell 0.7-1.05% occupational (because they live there) + Cincinnati city 1.8% on the wages they earned in Cincinnati. OH residents commuting south to a Northern Kentucky office pay OH 3.5% state (no KY state) + their home OH city tax + the KY county occupational tax on the work site. The reciprocity saves the state-level double-tax; the local layer is still real money.

Southern Indiana to Louisville is the second-biggest cross-border flow. Clark County (Jeffersonville, New Albany) and Floyd County are functionally Louisville bedroom communities. IN residents commuting to Louisville pay IN 2.95% state + their IN county tax (Clark ~1%, Floyd ~1.36%) + Louisville Metro 2.2% on the workdays in Louisville. The Louisville Metro tax is the part that bites — it applies regardless of reciprocity, because it's a local-jurisdiction wage tax, not a state income tax.

Four scenarios that cover most readers. Find the one closest to you. If none match, the calculator at the top is for you.

Kentucky property tax averages about 0.83% effective on market value — among the lower rates nationally, well below the 1.1% US average. Approximate county-level effective rates on a primary residence: Jefferson (Louisville) 0.90-1.05%, Fayette (Lexington) 0.85-1.00%, Boone (Florence/Burlington) 0.85-0.95%, Kenton (Covington/Erlanger) 0.95-1.10%, Campbell (Newport) 0.95-1.10%, Warren (Bowling Green) 0.75-0.90%, Daviess (Owensboro) 0.85-0.95%, Madison (Richmond) 0.70-0.85%, Scott (Georgetown) 0.85-1.00%.

The occupational tax map is the other half of the residential decision. Major levies: Louisville/Jefferson County 2.2% (1.45% Metro + 0.75% Jefferson County Public Schools), Lexington-Fayette 2.25%, Bowling Green 1.85%, Florence 2.0%, Owensboro 1.78%. Northern Kentucky counties run lower: Boone 0.8%, Kenton 0.7097%, Campbell 1.05%. Smaller cities and rural counties frequently levy nothing or a token rate.

This combination — modest property tax plus highly variable local occupational — is the structural reason KY residential demand has been migrating to lower-tax counties for two decades. A Lexington-area family moving from inside the city limits to neighboring Jessamine, Scott, or Madison County keeps their state 4% rate but drops their local rate from 2.25% to under 1% — on a $150K household income, that's roughly $1,500-$2,000/year of real tax savings, every year, for an extra 20-minute commute. The math compounds.

The Nashville pitch lands hard at every Louisville happy hour. Sometimes it's right. Often it isn't. Three variables most pitch decks understate:

If you're earning $100K+ in KY and you're not doing most of these, you may be leaving real money on the table. None of this is exotic. Most of it is 30 minutes of setup once a year and discipline the rest of the year.

Kentucky is one of the more under-marketed tax stories in the country. The 4% flat state rate is competitive on its own, the phase-down trajectory is real, the property tax is genuinely low, and the reciprocity network is the broadest of any state. The hidden variable is the local occupational tax — which makes Louisville and Lexington noticeably more expensive than the headline state rate suggests, but leaves Northern Kentucky, Bowling Green, and most rural counties in genuinely tax-friendly territory.

Run your numbers in the calculator above. Watch your effective rate, not just the 4% headline. Then add your local occupational rate manually — the calculator doesn't model it. Louisville (2.2%), Lexington (2.25%), Bowling Green (1.85%), Florence (2.0%), Northern KY counties (0.7-1.05%). If you live near a city limit, check whether your specific address is inside or outside the line — the difference is real money.

If you commute across a KY state line, file the right reciprocity certificate with your employer (KY Form 42A809 for incoming workers, the equivalent in your home state for outgoing). Skipping the form means double-withholding and a credit reconciliation at filing time.

If you're under-saving in retirement accounts, fix that this month before any other tax move. The biggest tax mistake most KY professionals make isn't paying too much KY tax — it's leaving thousands on the table in 401(k), HSA, and Mega Backdoor Roth shelter. The General Assembly makes for an easy villain; the harder one is in the mirror, and that one's beatable.