Kentucky Payroll: Employer Tax and Software Guide

Kentucky has one of the simplest state income tax calculations in the country and one of the most fragmented local ones. The state rate is a flat 3.5 percent with no brackets, one withholding certificate, and one set of returns. That part takes an afternoon to set up.

Then you meet the occupational license fee. Roughly 170 Kentucky cities and 87 counties levy their own tax on wages earned inside their boundaries, and not one of those returns goes to the Department of Revenue. Each jurisdiction registers you separately, sets its own rate, and picks its own filing rhythm. A Louisville employer with a crew that works two days a week in Oldham County is filing with three governments that share nothing with each other.

Add seven reciprocity agreements, five of them with states that share a border, a seventh-day overtime rule that has no federal counterpart, and a final paycheck deadline that runs on whichever date falls later, and Kentucky stops being the easy state its flat rate suggests. This guide covers what the Commonwealth requires from employers, the local layer that state registration does not cover, and how 10 payroll providers price the work at 10, 25, and 50 employees.

What Kentucky requires from employers

Kentucky imposes two state-level payroll obligations, income tax withholding and unemployment contributions, administered by two different agencies. There is no state disability insurance, no paid family leave premium, and no statewide paid sick leave mandate, which makes the state side genuinely light compared with most of its peers.

State income tax withholding

The rate is a flat 3.5 percent of taxable income for tax year 2026, confirmed by the Kentucky Department of Revenue. House Bill 1 from the 2025 legislative session dropped it from 4.0 percent effective January 1, 2026. A further step down to 3.0 percent for 2027 depended on a revenue trigger the Commonwealth missed by roughly $7.5 million, so 3.5 percent is the working number until the General Assembly says otherwise.

The calculation is short. Annualize the wages for the pay period, subtract the Kentucky standard deduction, apply 3.5 percent, then divide by the number of annual pay periods. The standard deduction is $3,360 for 2026, up $90 from $3,270, and the Department resets it each year under KRS 141.081. There are no personal exemptions and no separate schedules by filing status, so the whole state calculation fits on one line of a withholding worksheet.

The state withholding certificate is Form K-4. It is not a copy of the federal Form W-4 and it does not carry allowances. Its main job is to let an employee claim exemption from Kentucky withholding where they qualify, so most employees who are simply subject to Kentucky tax never need to file anything beyond it once.

Deposit schedules and returns

The Department of Revenue assigns filing frequency from annual Kentucky withholding liability, and the thresholds are low enough that a growing employer moves through several of them.

Form K-1 covers every period that does not end on December 31. Form K-3 covers the period ending December 31 and carries the annual reconciliation in the same document. Every filing frequency is required to file and pay electronically, so there is no paper path left for any size of employer. A return is due for each period even when nothing was withheld.

A 25-person Kentucky company averaging $55,000 in salary generates roughly $45,000 of annual Kentucky withholding, which lands in the monthly tier with the twice-monthly threshold visible from there. Withholding statements, meaning Forms W-2, W-2G, and the 1099 series, are due to the Department by January 31 along with Form K-5 where it applies.

Unemployment insurance contributions

Unemployment insurance is an employer-only cost in Kentucky, with nothing withheld from employees. According to the Kentucky Office of Unemployment Insurance, the taxable wage base is $12,000 per employee for 2026, up from $11,700 in 2025 and $11,400 in 2024. The Commonwealth has been raising it in $300 steps, and no surcharge has been assessed since 2016.

Rate Schedule A applies for 2026, as it has every year since 2019. The published rate tables show Schedule A running from 0.30 percent for employers with a reserve ratio of 8.0 percent or more up to 2.40 percent at the bottom of the positive band, then jumping to 6.50 percent where the reserve ratio turns negative and topping out at 9.00 percent.

The $12,000 base is one of the lowest in the country, which caps the absolute exposure at a level most employers can absorb. The construction rule is the exception worth flagging. Under KRS 341.272, a new employer in the contract construction trades pays the maximum rate rather than the 2.7 percent new employer rate, which is a difference of roughly $756 per employee per year before any experience rating applies.

Pay frequency, final pay, and the seventh day

KRS 337.020 requires wages to be paid at least semimonthly, and it adds a second condition employers routinely miss: each payment must cover wages earned to a day not more than 18 days before the payment date. A monthly payroll does not comply, and neither does a semimonthly cycle with a long processing lag. An employee absent on payday must be paid afterward on six days' demand.

Final pay follows KRS 337.055, which uses one deadline for quits and terminations alike. All wages earned are due no later than the next normal pay period following separation, or 14 days after the separation date, whichever occurs last. Most states run this test on whichever comes first, and Kentucky is the opposite, which changes the answer whenever someone leaves in the days just before a scheduled payday.

Minimum wage, registration, and new hire reporting

Kentucky's minimum wage is $7.25 per hour under KRS 337.275, which adopts the federal rate by reference and has not moved since July 1, 2009. It is not indexed and no increase is scheduled. Tipped employees follow the federal structure with a $2.13 cash wage and a tip credit of up to $5.12, with the employer covering any shortfall.

Registration runs through two agencies. The Department of Revenue issues the withholding account number and sets filing frequency; the Office of Unemployment Insurance issues the employer identification number and assigns the contribution rate. Workers compensation coverage is a separate requirement, and the local occupational license accounts covered in the next section are separate again.

New hires and rehires go to the Kentucky New Hire Reporting Center within 20 days of the hire date under KRS 405.435. The full new hire reporting obligation covers rehires after a break in service as well as first-time employees, which is the part seasonal employers tend to miss.

The local layer that state registration does not cover

Kentucky local governments levy occupational license fees on wages earned inside their boundaries, and none of those returns pass through the Department of Revenue. Registering for state withholding and unemployment leaves this entire obligation untouched.

The scale is the point. A presentation delivered to a Kentucky legislative committee in October 2025 by the state's county and city associations counted roughly 170 cities and 87 counties levying the tax on payroll, with school districts adding a further layer in some areas. There is no central collector, no shared registration, and no common form set. Each jurisdiction sets its own rate, its own filing schedule, its own thresholds, and its own penalties.

Louisville is the clearest example of how the layers stack. The 2.2 percent resident rate is not one tax but three: Louisville Metro at 1.25 percent, the Transit Authority of River City at 0.2 percent, and the School Boards Tax at 0.75 percent. Non-residents who work in Jefferson County pay 1.45 percent, the same package without the school board component. Employers file Form W-1 quarterly, and any employer that withheld more than $3,000 in any one of the preceding four quarters also owes monthly deposits due 15 days after the month ends.

Northern Kentucky shows the other pattern. Boone County charges 0.8 percent under its own ordinance, but the rate only reaches wages up to an annual cap that the county resets every year, which puts the effective burden on a senior salary well below the headline percentage. On top of that sit a separate county mental health levy with a much lower cap of its own and a school district levy with no cap at all, each calculated on gross compensation with no pre-tax deductions allowed. Boone, Kenton, Campbell, and Scott counties are treated as multi-district regions with their own combined return forms, and under KRS 68.197 an employee who pays a city license fee takes a credit against the county fee rather than paying both in full. Pull the county's current rate sheet before you configure withholding, because the cap amounts move annually.

Seven reciprocity agreements and seven borders

Kentucky has income tax reciprocity with Illinois, Indiana, Michigan, Ohio, Virginia, West Virginia, and Wisconsin, one of the largest such networks in the country. A qualifying employee files Form 42A809 with the employer, which authorizes the employer to stop withholding Kentucky income tax on those wages.

Two of Kentucky's seven neighbors are outside the network. Tennessee has no wage income tax of its own, so a Tennessee resident working in Kentucky is subject to ordinary Kentucky withholding with no offsetting home-state credit worth claiming. Missouri residents are simply subject to Kentucky withholding. For employers around Cincinnati, Evansville, Huntington, or Clarksville, the practical effect is that multi-state payroll starts at a much smaller headcount here than in the interior of the country, and the reciprocity paperwork has to be collected on day one rather than at year end.

10 payroll providers for Kentucky employers compared

Every provider below files Kentucky state withholding and unemployment contributions. The differentiator that actually separates them here is the local layer: whether the platform registers with and files returns for the city and county occupational license jurisdictions where your people work, or whether it calculates the withholding and hands the filing back to you.

OnPay

One plan at $49 per month plus $6 per employee, with every feature included and no tiers to climb. Tax filing covers all 50 states with no multi-state surcharge, which matters more in Kentucky than in most states given how quickly a border hire becomes real. Local tax filing sits in the base plan rather than behind an upgrade, and year-end W-2 and 1099 filing is included rather than billed separately.

Gusto

The most common first payroll purchase for US small businesses, with automatic tax filing, published pricing, and the strongest onboarding experience among payroll-first platforms. Simple runs $49 per month plus $6 per employee following a base increase in early 2026, and local tax filing is handled on every tier.

The single-state limit on Simple is a sharper constraint in Kentucky than the headline suggests. Seven states share a border with the Commonwealth and seven hold reciprocity agreements with it, so one hire across the Ohio River moves you to Plus at $80 plus $12 per employee. Model that number before you sign rather than after.

Patriot Software

The cheapest legitimate full-service payroll available, and notable in Kentucky because Full Service includes local tax filing rather than treating it as an add-on. Full Service is $37 per month plus $5 per employee and covers federal, state, and local filing plus new hire reporting. Basic is $17 plus $4 if you file taxes yourself, which in a Kentucky context means handling K-1 returns and every local occupational return by hand.

Additional state filings cost $12 per month each, which is the figure to watch for anyone hiring across the Indiana or Ohio line.

SurePayroll

Owned by Paychex and aimed at very small employers and household employers. Full Service is $29 per month plus $7 per employee, with a flat $9.99 monthly multi-state fee regardless of how many states are involved. That flat structure is genuinely useful for a Kentucky business with a few people across the Tennessee or Indiana line. Local tax filing is treated as an add-on rather than standard, which is a real gap given how much of Kentucky payroll is local.

QuickBooks Workforce Payroll

Formerly QuickBooks Payroll, now renamed. Core is $50 per month plus $6.50 per employee. The reason to pick it has always been the same: if your books already live in QuickBooks Online, payroll entries reach the general ledger without an export step. Local tax support is limited and tier-dependent, which is the wrong shape of limitation for a Kentucky employer with staff in more than one county.

ADP RUN

ADP has the deepest tax compliance engine in the category, and Kentucky is a state where that depth converts directly into value. Hundreds of local taxing jurisdictions with independent rate changes and filing calendars are exactly the kind of complexity large platforms absorb as routine and small platforms handle by asking you to file it yourself.

The cost is opacity. ADP does not publish RUN pricing; third-party estimates put Essential near $79 per month plus $4 per employee, but every quote is individual. Contracts typically run a year with automatic renewal and a 30 to 60 day cancellation window.

Paychex Flex

Paychex competes on service rather than software, and unusually among quote-driven vendors it publishes an entry rate: Essentials at $39 per month plus $5 per employee, with higher tiers quoted individually. In Kentucky the service model earns its keep the first time a county revenue office sends a notice about a return you did not know existed.

Paylocity

Paylocity sits between small-business payroll and full HCM, aimed at companies that have outgrown basic payroll but do not want enterprise complexity. It maintains detailed per-state tax resources including Kentucky, and the HR module covers performance, learning, and engagement alongside payroll. Pricing is quote-based and implementation is a project rather than a signup.

Rippling

Rippling sells a unified employee record where payroll, HR, and IT provisioning share one data model. The core platform is $35 per month plus $8 per employee, with payroll as a separate module. Real-world all-in costs land between $25 and $45 per employee per month once you assemble a working configuration. The structural advantage in Kentucky is that a home address change in the HR record propagates into local tax resolution rather than sitting in a spreadsheet.

Justworks

Two products under one name. Payroll is $50 per month plus $8 per employee and is straightforward software. PEO Basic at $79 per employee per month is a co-employment arrangement that gives a small Kentucky business access to benefits priced off a much larger risk pool, which is the actual reason most companies buy it.

What each provider actually costs a Kentucky employer

The table below models published rates at three headcounts, with a column for local filing because that is the axis that separates outcomes in this state. Kentucky payroll services get compared on base fee far too often and on local coverage far too rarely.

Patriot stays cheapest at every headcount and still includes local filing, which is an unusually good combination for a Kentucky employer. Paychex Flex is the surprise on the published side: its entry tier prices close to the budget providers while carrying a service model the budget providers do not have. SurePayroll looks competitive on base fee and then treats local filing as an add-on, and QuickBooks has the same shape of gap on its entry tier.

Software price is also not the whole Kentucky number. A Louisville employer with 25 people on $55,000 salaries withholds roughly $30,000 a year in occupational license fees from employees and files those returns quarterly with monthly deposits on top. That is not an employer cost, but it is employer work, and the gap between the cheapest and most expensive platform on this table is a few hundred dollars a year by comparison.

Choosing a payroll provider for Kentucky

Four questions separate providers that will work here from providers that will quietly generate notices from governments you have not registered with.

One item sits outside the payroll engine entirely. Every Kentucky new hire needs a federal I-9 and W-4, a Kentucky Form K-4, a Form 42A809 where the employee lives in a reciprocity state, local occupational enrollment where a jurisdiction requires it, and a new hire report filed within 20 days.

Before you choose

FirstHR does not process payroll, file payroll taxes, or administer benefits. We do not calculate pay, we do not move money, and we do not register you with a county revenue office.

Every provider above does something we do not, and if running payroll is the problem in front of you, one of them is the answer. What we handle is the layer that feeds payroll: onboarding workflows, e-signatures on I-9s and offer letters, employee records, and HR document management for small US teams at a flat $98 to $198 per month.

If the recurring problem is that the K-4 never got signed, the 42A809 for the employee commuting in from Cincinnati is missing, nobody recorded which county the new field tech actually works in, and the 20-day new hire report may or may not have gone out, that is a document collection failure rather than a payroll processing failure.

Frequently Asked Questions

What is the Kentucky income tax rate for payroll withholding?

A flat 3.5 percent of taxable income, down from 4.0 percent under House Bill 1 from the 2025 session. Withholding is computed by annualizing the pay period wages, subtracting the $3,360 standard deduction, applying 3.5 percent, and dividing by the number of pay periods. The revenue trigger for a further cut to 3.0 percent was missed by roughly $7.5 million.

What is the Kentucky unemployment insurance wage base and rate range?

$12,000 per employee, up from $11,700 the prior year. Rate Schedule A applies, running 0.30 to 2.40 percent for employers with a positive reserve ratio and 6.50 to 9.00 percent for negative-reserve employers. New employers pay 2.7 percent, and new contract construction employers pay the maximum 9.0 percent under KRS 341.272. Contributions are employer-paid.

What is the Kentucky minimum wage?

$7.25 per hour under KRS 337.275, which adopts the federal rate by reference and has not changed since July 1, 2009. It is not indexed and no increase is scheduled. Tipped employees receive a $2.13 cash wage with a tip credit of up to $5.12, and Kentucky preempts local minimum wage ordinances, so the floor is uniform statewide.

How often must Kentucky employers pay employees?

At least semimonthly under KRS 337.020, and each payment must cover wages earned to a day not more than 18 days before the payment date. A monthly payroll does not comply, and neither does a semimonthly cycle with a long processing lag. An employee absent on payday must be paid afterward on six days' demand.

When is a final paycheck due in Kentucky?

Under KRS 337.055, no later than the next normal pay period following the separation date or 14 days after it, whichever occurs last. Kentucky uses the same deadline for quits and discharges. The word is last rather than first, which is the opposite of most states and changes the answer whenever someone leaves shortly before a scheduled payday.

Do Kentucky cities and counties charge a local payroll tax?

Yes. Roughly 170 cities and 87 counties levy occupational license fees on wages earned inside their boundaries, with school districts adding a layer in some areas. None of it is collected by the Department of Revenue. Each jurisdiction has its own registration, rate, forms, and filing calendar, and state registration covers none of them.

What are the Louisville Metro occupational license fee rates?

Residents who work in Jefferson County pay 2.2 percent, made up of Louisville Metro at 1.25 percent, the Transit Authority of River City at 0.2 percent, and the School Boards Tax at 0.75 percent. Non-residents working there pay 1.45 percent. Employers file Form W-1 quarterly, plus monthly deposits if withholding exceeded $3,000 in any of the preceding four quarters.

Which states have reciprocity agreements with Kentucky?

Illinois, Indiana, Michigan, Ohio, Virginia, West Virginia, and Wisconsin. Employees file Form 42A809 so the employer can stop withholding Kentucky income tax. Virginia residents qualify only by commuting daily, and Ohio residents are excluded if they hold 20 percent or more equity as a shareholder-employee in an S corporation.

How often does a Kentucky employer file withholding returns?

Annually under $400 of yearly withholding, quarterly from $400 to $1,999, monthly from $2,000 to $49,999, and twice monthly at $50,000 or more. Form K-1 covers periods not ending December 31 and Form K-3 covers the December period plus the annual reconciliation. All frequencies must file and pay electronically, and $100,000 accumulated in one period must be remitted within one banking day.

Does Kentucky require overtime pay on the seventh consecutive workday?

Yes. KRS 337.050 requires time and a half for hours worked on the seventh day of a workweek, with a narrow exception where the employee is not permitted to exceed 40 hours that week, plus a short list of occupational exclusions and an exemption for supervisors. It is independent of the federal 40-hour threshold, so standard overtime logic will not produce it without configuration.

Does Kentucky have a state disability, paid leave, or sick leave program?

No. There is no state disability insurance, no paid family and medical leave premium, and no statewide paid sick leave mandate. State-level deductions on a Kentucky pay stub are income tax withholding and local occupational license fees, and that is the full list. Paid 10-minute rest periods per four hours worked are required under KRS 337.365.

How do I register a business for Kentucky payroll taxes?

The Department of Revenue issues the withholding account number and sets filing frequency. The Office of Unemployment Insurance issues the employer identification number and assigns the contribution rate. Workers compensation is separate, and each city or county where employees physically work requires its own occupational license account. New hires are reported within 20 days under KRS 405.435.

How much does payroll software cost for a Kentucky small business?

At 10 employees, published July 2026 rates run roughly $87 for Patriot Full Service, $89 for Paychex Flex Essentials, $99 for SurePayroll, $109 for OnPay or Gusto Simple, $115 for QuickBooks Core, and $130 for Justworks Payroll. At 50 employees the same plans land between $287 and $450. ADP RUN and Paylocity quote individually.

What forms does a Kentucky new hire need?

Federal Form I-9 and Form W-4, Kentucky Form K-4, and Form 42A809 where the employee lives in a reciprocity state. Add a direct deposit authorization, local occupational enrollment where a jurisdiction requires it, and the new hire report within 20 days.