Mortgage Prepayment Penalty Calculator
Find out if paying your mortgage's prepayment penalty is financially worth it. Enter your loan details and penalty type, then choose your scenario — refinancing to a lower rate or paying off early — to see the exact penalty cost, interest savings, break-even month, and net savings. Free, private, no sign-up required.
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What Is a Mortgage Prepayment Penalty?
A mortgage prepayment penalty is a fee charged by a lender when a borrower pays off all or a significant portion of their mortgage loan earlier than the agreed schedule — whether by refinancing, selling the property, or making lump-sum payments. According to the Consumer Financial Protection Bureau (cfpb.gov), prepayment penalties were far more common before the 2008 financial crisis but are now limited by the Dodd-Frank Act for most "qualified mortgages." However, they still appear in certain conventional loans, jumbo loans, and non-QM (non-qualified mortgage) products originated before or outside the standard regulatory framework.
The CFPB's 2013 Ability-to-Repay rule prohibits prepayment penalties on most fixed-rate qualified mortgages and restricts them on adjustable-rate loans to the first three years. For non-QM loans, subprime loans, or older mortgages, penalties can still range from 1% to 5% of the remaining balance — a significant cost that must be weighed against the savings of refinancing or paying off early.
The 3 Types of Prepayment Penalties Explained
Prepayment penalties take three common forms, and identifying which applies to your loan is the critical first step before running any break-even analysis:
- Percentage of remaining balance (most common): A flat percentage — typically 2% to 5% — is charged on the outstanding loan balance at the time of prepayment. For a $320,000 balance with a 3% penalty, you would owe $9,600. This type is simple to calculate and often found in conventional loans and older subprime mortgages.
- Months of interest (yield maintenance): The penalty equals a specified number of months of interest on the remaining balance — commonly 3 to 6 months. For a $320,000 balance at 7.25%, six months of interest equals approximately $11,600. This type is more common in commercial mortgages and some adjustable-rate products.
- Declining scale (step-down penalty): The penalty percentage decreases each year the loan remains in force — typically 5% in year 1, 4% in year 2, 3% in year 3, 2% in year 4, 1% in year 5, and zero thereafter. This structure rewards borrowers who wait longer before refinancing. It is common in 5/1 ARM loans and some commercial bridge loans.
To find your penalty type, check your original loan documents, the HUD-1 or Closing Disclosure, or your mortgage note. The CFPB's mortgage toolkit at cfpb.gov provides guidance on locating prepayment penalty clauses. Last updated: May 2026.
Break-Even Analysis: Is the Penalty Worth Paying?
The break-even month is the single most important metric when deciding whether to pay a prepayment penalty. It answers: "How long after paying the penalty will I have recovered that cost through interest savings?" The calculation works as follows:
- Refinancing scenario: Calculate the total interest you would pay on your current loan over the remaining term. Then calculate the total interest on the new loan at the lower rate for the same term. The difference is gross interest savings. Subtract the penalty cost to get net savings. Divide the penalty by the monthly savings to get the break-even month.
- Early payoff scenario: Calculate the total interest remaining on your current loan versus the total interest if you pay down extra each month (or pay off entirely). The difference is your gross interest savings. Again, subtract the penalty and divide by monthly savings to find break-even.
As a rule of thumb: if you plan to stay in the home (or keep the loan) for at least 2× the break-even period, paying the penalty is almost always worth it. If you might move or refinance again within the break-even window, consider waiting until the penalty expires or drops to a lower tier on a declining scale.
When to Pay the Penalty — and When to Wait
The decision is rarely black-and-white. Here are the key factors the CFPB recommends considering before paying a prepayment penalty:
- Rate differential: A 1.25%+ rate reduction on a $300,000+ balance typically generates enough interest savings to recoup a 2–3% penalty within 24–36 months. Smaller differentials (under 0.5%) may take 6+ years to break even, making it risky if you anticipate moving.
- Time remaining on the penalty window: If your penalty is on a declining scale and you're in year 4 (2% rate), waiting one more year to year 5 (1% rate) halves the penalty cost. Sometimes waiting 6–12 months can save thousands.
- Loan balance size: Prepayment penalties are most painful on large balances. A 3% penalty on a $500,000 loan is $15,000 — a significantly longer break-even period than the same 3% on a $150,000 loan.
- How long you plan to stay: Refinancing to save $200/month with an $8,000 penalty requires 40 months in the home to break even. If you plan to move in 3 years, the math does not work.
- Closing costs: This calculator focuses on penalty vs. interest savings, but refinancing also incurs closing costs of typically 2–3% of the new loan. Run both together using our Refinance Savings Calculator for the full picture.
Sources: cfpb.gov. Last updated: May 2026.