See how much interest you save and how many years you cut by paying extra on your mortgage.
With 30-year mortgage rates at 6.75% in 2026, the case for extra payments is strong for risk-averse homeowners. Each extra dollar of principal payment earns a guaranteed, tax-free return equivalent to your mortgage rate. Homeowners with mortgages originated at 2.5–3.5% may prefer investing — but those at 6.5–7.5% rates benefit significantly from accelerated payoff.
Understanding why extra mortgage payments are so powerful requires understanding mortgage amortization — specifically how much of each payment goes to interest versus principal in the early years.
Every month, your lender calculates interest on your current balance: Interest = Balance × (Annual Rate ÷ 12). On a $350,000 mortgage at 6.75% (30-year), your monthly payment is about $2,269. In the very first payment: $1,969 goes to interest and only $300 reduces your principal. By year 10, the split is roughly $1,700 interest vs. $569 principal. Only in the final years does principal paydown accelerate significantly.
When you make an extra principal payment, you permanently reduce the balance that future interest is calculated on. At 6.75%, each $1 of extra principal payment saves approximately $1.67 in total interest over the loan's life. The earlier you start, the greater the compounding savings.
| Strategy | Approx. Years Saved | Approx. Interest Saved |
|---|---|---|
| $100/mo extra | 2.5 years | $28,000 |
| $250/mo extra | 5.5 years | $60,000 |
| $500/mo extra | 9 years | $100,000 |
| $1,000/mo extra | 14 years | $148,000 |
| Biweekly payments | 4 years | $50,000 |
Based on a $320,000 mortgage at 6.75% for 30 years. Amounts are approximate.
Their Mortgage:
With $500/Month Extra:
Compare rates from 500+ lenders. Free, no obligation, no credit score impact. Get pre-approved in minutes.
Compare Rates Free →We may earn compensation when you connect with services through this site.
The interest savings from extra payments can be dramatic. On a $300,000 mortgage at 6.75%, adding just $250/month extra saves approximately $70,000 in interest and pays off the loan 7 years early. Adding $500/month saves about $105,000 and cuts 10+ years off the term. The earlier in the loan term you start, the more you save — since more of each early payment goes to interest.
This is one of personal finance's most debated questions. Mathematically, if your mortgage rate (6.75%) is lower than your expected investment return (S&P 500 historical ~10%), investing wins in expected value. However, paying off your mortgage gives guaranteed, tax-free returns equal to your mortgage rate, provides psychological peace of mind, reduces risk, and eliminates housing-related cash flow risk in retirement. Many financial planners recommend a blended approach: maximize 401(k) match, build 6-month emergency fund, then split extra money between investing and mortgage paydown. Consult a financial advisor for guidance specific to your situation.
Not always. When making extra payments, you should clearly designate them "apply to principal" either online, on your check, or by calling your servicer. Some servicers default to advancing your next payment due date rather than reducing principal. Always verify on your next statement that the extra payment was correctly applied to principal balance reduction.
Yes — a biweekly payment strategy results in 26 half-payments per year (equal to 13 full monthly payments instead of 12), effectively making one extra monthly payment per year. On a 30-year $300,000 mortgage at 6.75%, biweekly payments pay off the loan about 4 years early and save approximately $50,000 in interest. It's a lower-commitment strategy than a fixed extra monthly payment but still significantly accelerates payoff.
Yes, always check your mortgage agreement before making large extra payments. Prepayment penalties are rare on most residential mortgages (illegal on most government-backed loans), but some conventional loans, especially those originated before 2014 or by portfolio lenders, may have them. Prepayment penalties typically only apply in the first 3–5 years and often only above a certain amount. Call your servicer to confirm before sending a large lump sum payment.
Disclaimer: Mortgage payoff calculations are estimates based on your inputs. Interest savings depend on exact payment amounts, timing, and how your servicer applies extra payments. Some mortgages have prepayment penalties — check your loan agreement before making large extra payments. Verify all extra payment applications with your loan servicer. The decision to pay extra on your mortgage involves personal financial tradeoffs that depend on your complete financial picture. Consult a licensed financial advisor for personalized guidance.