Mortgage Penalty Calculator
Estimate your mortgage prepayment penalty before breaking your term.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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This calculator estimates the prepayment penalty you may owe for breaking your mortgage before the term ends. Here is how to use it:
- Enter your outstanding balance. This is the current remaining principal on your mortgage. Check your most recent mortgage statement for the exact figure.
- Enter the original mortgage amount. The principal you originally borrowed. Some penalty calculations reference this number.
- Enter your contract interest rate. This is the rate on your current mortgage agreement, not the current market rate.
- Enter the remaining term in months. Count how many months are left until your mortgage term (not amortization) expires.
- Select the penalty method. Choose "3-Month Interest" for a simple three months of interest on the outstanding balance. Choose "IRD" for the Interest Rate Differential method, which compares your contract rate to the current market rate.
- For IRD, enter the current market rate. This field appears when you select the IRD method. Use the rate your lender would currently offer for a term matching your remaining months.
Both penalty amounts are shown for comparison. The actual penalty your lender charges may be the greater of the two, depending on your mortgage contract.
About Mortgage Prepayment Penalties
A mortgage prepayment penalty is a fee charged by lenders when you pay off your mortgage early, either by refinancing or selling. The two most common calculation methods are the 3-month interest penalty (three months of interest on your current balance) and the Interest Rate Differential (IRD), which accounts for the difference between your contract rate and current market rates over the remaining term.
Many lenders charge the higher of the two penalties, so it is important to calculate both. Some mortgages include prepayment privileges that allow you to pay a percentage without penalty. Review your mortgage contract or contact your lender for exact terms. All calculations here run in your browser with no data stored.
Frequently Asked Questions
What is a 3-month interest penalty?
A 3-month interest penalty equals three months of interest calculated on your outstanding mortgage balance at your contract rate. For example, a $250,000 balance at 5.5% would result in a penalty of approximately $3,437.50 (250,000 x 0.055 x 3/12).
What is the Interest Rate Differential (IRD)?
The IRD penalty compensates the lender for the interest they lose when you break your mortgage early. It is calculated by multiplying your outstanding balance by the difference between your contract rate and the current market rate, then by the remaining term. When rates have dropped significantly, the IRD penalty can be much larger than the 3-month interest penalty.
Can I avoid the mortgage penalty?
Some options include waiting until your term ends, porting your mortgage to a new property, or using annual prepayment privileges to reduce the balance before breaking. Some open mortgages have no penalty but carry higher rates. Review your specific mortgage terms for available options.
Which penalty method will my lender use?
Most fixed-rate mortgages charge the greater of the 3-month interest or IRD penalty. Variable-rate mortgages typically use only the 3-month interest calculation. Your mortgage contract specifies which method applies. Contact your lender to confirm before making a decision.