IRS Failure to Pay Penalty: Rates, Rules & Relief
The Failure to Pay (FTP) penalty is one of the most common IRS penalties — and one of the most misunderstood. At 0.5% per month on any unpaid balance after the filing deadline, it can grow quickly. But the rules change if you have an installment agreement, if a levy notice has been issued, or if you qualify for First-Time Abate. Here is exactly how it works and how to fight back.
How the Failure to Pay Penalty Works
Standard Rate — 0.5% Per Month
The FTP penalty is 0.5% of the unpaid tax balance for each month (or partial month) the tax remains unpaid after the original due date (typically April 15). The penalty accrues until the tax is paid in full or until it reaches the 25% maximum cap — which takes approximately 50 months.
Installment Agreement Rate — 0.25% Per Month
If you have an approved IRS installment agreement in place, the FTP penalty rate is cut in half — from 0.5% to 0.25% per month — for the months the agreement is active. This is a substantial reduction. However, interest on the unpaid balance continues to accrue at the federal short-term rate plus 3%.
Levy Notice Rate — 1% Per Month
If the IRS sends a final notice of intent to levy (CP504 or Letter 1058) and you still do not pay within 10 days, the FTP rate jumps to 1% per month. This is double the standard rate and quadruple the installment agreement rate — a powerful incentive to resolve the debt before levy action begins.
25% Cap
No matter how long the tax remains unpaid, the FTP penalty cannot exceed 25% of the original unpaid tax. Once the penalty reaches the cap, it stops accruing — but interest continues to run on both the tax and the accumulated penalty balance.
Combined FTF + FTP — The 5% Monthly Cap
When both the Failure to File (FTF) and Failure to Pay (FTP) penalties apply simultaneously, the FTP credit reduces the FTF penalty dollar-for-dollar. The combined maximum is 5% per month (the FTF 5% rate, with the FTP portion credited against it), not 5.5%. This interaction prevents the IRS from doubling up.
FTP Penalty by the Numbers — Real Examples
$10,000 Unpaid — Standard Rate
At 0.5% per month, the FTP penalty is $50/month. After one year: $600 in penalties. After the full 50 months to reach the 25% cap: $2,500. Plus interest on the $10,000 tax and on the growing penalty balance.
$10,000 Unpaid — With Installment Agreement
At the reduced 0.25% rate under an active installment agreement, the monthly penalty drops to $25/month. Over a 36-month payment plan: $900 in FTP penalties instead of $1,800 — a savings of $900. Interest still accrues separately.
$10,000 Unpaid — After Levy Notice
Once the levy notice is issued and 10 days pass, the rate jumps to 1% — $100/month. That is $1,200 in penalties per year, and the 25% cap ($2,500) is reached in just 25 months instead of 50. The levy threat demands immediate action.
FTF + FTP Combined — $10,000 Example
FTF penalty: 5% = $500/month. FTP penalty: 0.5% = $50/month. Combined (with credit): $500/month (not $550). The FTP amount reduces the FTF, so the total never exceeds 5% in any month. After 5 months, FTF maxes out at 25% ($2,500) and only FTP continues.
Interest Runs Separately from Penalties
Federal Short-Term Rate + 3%
Interest on unpaid tax is calculated at the federal short-term rate (determined quarterly) plus 3 percentage points. Unlike the FTP penalty, interest has no cap — it accrues until the entire balance (tax, penalties, and accrued interest) is paid in full.
Daily Compounding
IRS interest compounds daily, meaning interest is calculated on the prior day's balance (including previously accrued interest). This accelerates the growth of the debt over time. The sooner you pay, the less interest you owe.
Interest on Penalties
Interest accrues on the penalty balance as well as on the tax. If your FTP penalty has grown to $2,500, the IRS charges interest on that $2,500 penalty — on top of the interest on the original tax debt. This compounding effect makes it critical to address penalties early.
How to Get the FTP Penalty Waived or Reduced
First-Time Abate (FTA)
The most powerful tool for penalty relief. If you have no penalties in the prior 3 tax years, all required returns are filed or on valid extension, and you are current on all tax payments (or in an approved installment agreement), the IRS will abate the FTP penalty in full. This is an administrative waiver — you do not need to prove hardship. Request it by phone or in writing.
Reasonable Cause
If circumstances beyond your control prevented timely payment despite you exercising ordinary business care and prudence, you may qualify for penalty relief under Reasonable Cause. Qualifying events include: serious illness or hospitalization, death in the immediate family, natural disaster (fire, flood, hurricane), inability to obtain records, or erroneous IRS advice. Documentation is required.
Installment Agreement
Even if you cannot get the penalty waived, entering an installment agreement cuts the ongoing FTP rate in half — from 0.5% to 0.25% per month going forward. This does not retroactively reduce penalties already accrued, but it sharply limits future penalty growth while you pay off the balance.
Offer in Compromise
In a successful Offer in Compromise (OIC), you settle your tax debt for less than the full amount owed. When the IRS accepts an OIC based on Doubt as to Collectibility, penalties (including FTP) are effectively settled along with the tax. If your financial situation makes full payment impossible, this may be your best option.