Max Loan Calculator

What Will It Cost to Get Out?

Prepayment penalties are deliberately opaque. This calculator estimates your cost—so you can decide if refinancing or selling makes financial sense.

Current Loan

$
%
Your current interest rate
mo
7.0 years until maturity
days

Penalty Type

%
Use 10-year Treasury for most calculations

Your penalty changes as Treasury rates move. Slide to see the impact.

-1.5%+1.5%
Current: 4.25%
Estimated Prepayment PenaltyHigh
$300,011
15.00% of balance

The lender is entitled to the interest income they would have earned. With 7.0 years remaining at 1.25% above current Treasuries, they're owed the present value of that spread.

Treasury Rate Sensitivity

-1.5%2.75%$696,093
-1%3.25%$559,439
-0.5%3.75%$427,470
0%4.25%$300,011
+0.5%4.75%$176,892
+1%5.25%$57,952
+1.5%5.75%$0

Key insight: When rates rise, your penalty drops (and vice versa).

Is Refinancing Worth It?

If you refinance at 6.75% (current market):

Annual Interest Savings-$25,000
Months to Break EvenNever
Time Remaining84 months
Won't break even before maturity. Consider waiting.

Understanding Prepayment Penalties

Yield Maintenance

Compensates the lender for lost interest income. When rates drop, your penalty rises (they're losing more). When rates rise, your penalty shrinks (they can relend at higher rates).

Formula: PV of (Note Rate − Treasury) × Balance × Remaining Term

Defeasance

Instead of prepaying, you substitute Treasury securities that match your remaining payments. The loan stays on the lender's books, but you're released from it. More complex and expensive than yield maintenance.

Costs: Treasury portfolio + Legal fees ($25-75K) + Admin fees

Step-Down

Simple and predictable: a fixed percentage that decreases each year. Common on shorter-term loans. Doesn't adjust based on interest rates, so it can be more or less expensive than yield maintenance depending on the market.

Example: 5% in Year 1, 4% in Year 2, 3% in Year 3...

The Open Window: Your Free Exit

Most agency loans (Fannie Mae, Freddie Mac) include a 90-day open window before maturity where you can prepay without penalty. Some loans offer 120 or 180 days. This is your chance to refinance, sell, or pay off debt-free.

Check your loan docs: The open window period varies by loan. Don't assume 90 days.
Plan ahead: If you're within 6 months of your open window, it may be worth waiting.
Rate lock timing: You can lock a new rate during the open window for a smooth transition.

Estimates only. Actual prepayment penalties depend on your specific loan documents. Yield maintenance and defeasance calculations vary by lender and may include additional fees. Always verify with your servicer before making decisions.