What is a mortgage prepayment penalty?

A fee charged by the lender when you pay off your mortgage before the full term — typically through refinancing, selling the property, or making large principal payments. It compensates the lender for lost interest income they expected to collect over the remaining term.

Are prepayment penalties legal?

In the US, Dodd-Frank and CFPB Qualified Mortgage (QM) rules restrict prepayment penalties on most residential loans written under QM protections. Non-QM loans (subprime, non-conforming) may still include them. In Canada, prepayment penalties are standard on fixed-rate mortgages.

How do I calculate break-even on refinancing with a penalty?

Break-even months = Total penalty ÷ Monthly payment savings. If the penalty is $9,000 and you save $200/month, break-even is 45 months (3.75 years). Refinancing makes sense if you plan to stay in the home longer than the break-even period.

What is an Interest Rate Differential (IRD) penalty?

Common in Canada, IRD calculates the penalty as the difference between your contract rate and the comparison rate, applied to the remaining balance for the remaining term. It can be much larger than a simple 3-months-interest penalty, especially when rates have dropped significantly.

Can I negotiate away a prepayment penalty?

Before signing the loan, you may be able to negotiate removal of the penalty clause, though the lender may charge a higher rate or fee in exchange. Once the loan is signed, negotiating away the penalty is much harder, though some lenders may reduce it to retain you as a customer.

Should I pay the penalty to refinance?

It depends on three factors: (1) the penalty amount, (2) the monthly savings from the lower rate, and (3) how long you will stay in the home. If net savings (total interest saved minus penalty) is positive and break-even is under 3-4 years, refinancing is usually worthwhile.

Mortgage Penalty Calculator

Calculate mortgage prepayment penalties — percentage, months of interest, or flat fee. Includes break-even analysis and refinance comparison.

Current Balance

Current Rate

Remaining Term

years

Penalty Type

Penalty %

New Rate (Refi)

New Term

years

Penalty Amount

$9,000.00

3% of balance

Monthly Savings

$183.36

$2,025.62 → $1,842.26

Break-Even

4.2 years

50 months to recoup penalty

Net Savings

$46,008.00

✓ Refinancing is beneficial

Current Remaining Interest

$307,686.00

Over 25 years

New Loan Interest

$252,679.00

Over 25 years at 5.5%

Verdict

Refinancing saves $46,008.00 net after penalty. Break-even in 4.2 years.

Penalty Scenarios

Penalty	Amount	Break-Even	Net Savings	Worth It?
1%	$3,000.00	1.4 yrs	$52,008.00	✓
2%	$6,000.00	2.8 yrs	$49,008.00	✓
3%	$9,000.00	4.2 yrs	$46,008.00	✓
4%	$12,000.00	5.5 yrs	$43,008.00	✓
5%	$15,000.00	6.8 yrs	$40,008.00	✓

Penalty Type Reference

Type	How It Works	Typical Range
% of Balance	Fixed percentage of outstanding balance	1-5% (often declining)
Months of Interest	Interest cost for N months	3-6 months
Flat Fee	Fixed dollar amount	$1,000-$10,000
Yield Maintenance	PV of remaining interest vs reinvestment	Varies (commercial)

Planning notes, formulas, and examples

About the Mortgage Penalty Calculator

A mortgage prepayment penalty is a fee charged by the lender when you pay off your mortgage early — typically through refinancing, selling, or making a large lump-sum payment. These penalties protect lenders from losing expected interest income when borrowers leave before the loan runs its full term.

Penalty structures vary widely: a percentage of the outstanding balance (1-5%), a number of months of interest (3-6 months), or a flat fee. Some penalties decline over time — starting at 5% in year one and decreasing by 1% each year. Understanding your penalty is critical before deciding to refinance or prepay.

This calculator computes your exact penalty under three common structures, then performs a break-even analysis against refinancing. It answers the key question: does the interest savings from a lower rate exceed the penalty cost? The penalty scenario table shows how different penalty levels affect the decision, while the verdict provides a clear recommendation based on your specific numbers.

When This Page Helps

Paying a penalty only makes sense if the refinance savings clearly outweigh the cost. This calculator compares the penalty amount with the rate savings, giving you a break-even timeline and net savings figure before you commit.

How to Use the Inputs

Enter your mortgage balance and interest rate.
Set the remaining term on your loan.
Choose the penalty type and enter the penalty parameter.
Input the new (refi) interest rate and term.
Review the penalty amount, monthly savings, and break-even period.
Check the verdict box for a clear recommendation.
Compare different penalty levels in the scenario table.

Formula used

Penalty (% of balance) = Balance × Penalty%. Penalty (months interest) = Balance × Monthly Rate × Months. Break-even = Penalty / Monthly Savings. Net Savings = Old Remaining Interest − New Interest − Penalty.

Example Calculation

Result: Penalty: $9,000 — Monthly savings: $183 — Break-even: 4.2 years — Net savings: $46,008

A $300K mortgage at 6.5% with a 3% prepayment penalty creates a $9,000 exit cost. Refinancing to 5.5% lowers the modeled payment by about $183 per month, so the penalty takes about 50 months, or 4.2 years, to recover. Over the full remaining term used in this worksheet, the lower rate still produces roughly $46,008 of net savings after subtracting the penalty.

Tips & Best Practices

Always check your original loan documents for prepayment penalty terms before planning a refi.
Many penalties decline over time (5% year 1, 4% year 2, etc.) — waiting a year can save thousands.
Most conventional US mortgages written under QM rules have no prepayment penalty.
Break-even under 3 years usually means refinancing is worthwhile; over 5 years is questionable.
Canadian mortgages commonly have penalties (IRD or 3 months interest) — check which applies.
Factor closing costs into the refi analysis on top of the penalty for a complete picture.

Penalty Checks

Confirm whether your lender uses a balance percentage, a number of months of interest, or a declining schedule before comparing refinance offers.

Refinance Decision

A penalty can still be worth paying when the rate drop is large enough, the break-even window is short, and you expect to keep the home past that date. Include closing costs and any term extension in the comparison so the result reflects the full cost.

Sources & Methodology

Last updated: March 29, 2026

Methodology

This worksheet estimates three common penalty structures: a fixed percentage of the remaining balance, a set number of months of interest, or a flat fee. It then compares the remaining interest cost on the existing loan with a hypothetical refinance at the entered new rate and term, using the difference in monthly payment to estimate a break-even period and net savings after the penalty.

It is a planning comparison rather than a legal interpretation of a note or mortgage rider. State-law limits, non-QM terms, yield-maintenance provisions, and lender-specific addenda can change the real penalty, so borrowers should verify the exact clause in their note, addendum, Loan Estimate, and payoff statement before acting on the result.

Sources

What is a prepayment penalty? (Consumer Financial Protection Bureau) — Official CFPB explanation of mortgage prepayment penalties, when they apply, and how borrowers should compare total costs.
Can I be charged a penalty for paying off my mortgage early? (Consumer Financial Protection Bureau) — Official CFPB guidance on mortgage prepayment-penalty disclosure, refinance or sale triggers, and state-law variation.

Frequently Asked Questions

A fee charged by the lender when you pay off your mortgage before the full term — typically through refinancing, selling the property, or making large principal payments. It compensates the lender for lost interest income they expected to collect over the remaining term.