Kentucky tax penalties at a glance

When you file or pay Kentucky taxes late, the Kentucky Department of Revenue adds a penalty and charges interest on the unpaid balance. These state penalties are assessed under Kentucky law and are entirely separate from any federal IRS penalty on your federal return.

Late-Filing Penalty
2% of tax due per 30 days, up to a maximum of 20%
Late-Payment Penalty
2% of tax due per 30 days, up to a maximum of 20%
Interest on Unpaid Tax
9% per year (2026)
State Tax Authority
Kentucky Department of Revenue
State DOR Phone
(502) 564-4581

Source: Kentucky Department of Revenue (official guidance). Penalty caps and interest rates change — several states reset interest quarterly — so verify the current figure before relying on it.

Getting a Kentucky penalty waived

Penalties (not statutory interest) may be waived for reasonable cause; supporting documentation is submitted to the assigned collection officer.

Kentucky vs. Federal

Most people who owe a Kentucky penalty also owe a federal IRS penalty — and the federal one is usually larger. The good news: federal penalties can often be removed entirely through first-time abatement or reasonable cause. That is the part our practice handles.

The federal side: IRS penalties & Form 843

The IRS does not assess penalties differently in Kentucky than anywhere else — failure-to-file, failure-to-pay, and failure-to-deposit penalties are governed by federal law and apply uniformly nationwide. What changes by state is the IRS service center your case routes through. For Kentucky, federal abatement requests are processed through the IRS service center in Cincinnati, OH.

The mechanism is the same everywhere: Form 843, mailed with substantiation. The legal grounds are first-time penalty abatement, reasonable cause, statutory exception, or administrative waiver. When abatement is granted, the IRS refunds the penalty and the interest it charged on that penalty.

Federal Form for Abatement
Form 843 (mailed)
IRS Service Center
Cincinnati, OH
Authorization Form
Form 8821 (Tax Info Auth)
Typical IRS Processing
60–120 days

What our practice does for Kentucky taxpayers

We represent clients in all 50 states under IRS Circular 230 authorization. Because federal abatement is state-agnostic, location is rarely a constraint. For Kentucky clients specifically, we pull your IRS transcripts (via Form 8821), confirm exactly which penalties were assessed and for which periods, route Form 843 to the Cincinnati, OH service center, and build the reasonable-cause substantiation. The work is contingency-based: if we do not recover, you do not pay.

Start with the calculator on this page — enter your name, email, and rough penalty and interest amounts. We return a refund estimate within one business day and, if you choose to proceed, send the Form 8821 authorization for signature.