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Frequently Asked Questions
- How much can I save by overpaying my mortgage?
- An extra $100/month on a $200,000 30-year mortgage at 6.5% saves approximately $44,000 in interest and pays off the loan 4-5 years early. An extra $500/month saves roughly $132,000 and pays off 12-13 years early. Use our calculator above for your exact numbers.
- Is it better to overpay mortgage monthly or annually?
- Monthly overpayments save slightly more interest than annual lump sums because you reduce the principal earlier each month rather than waiting until year-end. On a $200,000 loan at 6.5%, $1,200/year paid as $100/month saves about $400 more over the life of the loan than one $1,200 annual payment.
- Should I overpay my mortgage or invest the extra money?
- Compare your mortgage rate to expected after-tax investment returns. If your mortgage rate is above 5-6%, overpaying is usually the better risk-adjusted choice. If below 4%, investing typically wins long-term. Between 4-5%, either is reasonable.
- Do I need to tell my lender I'm overpaying?
- Most lenders apply extra payments to principal automatically. But some apply extra payments to future interest or escrow unless you specify "apply to principal." Check your statement after making an extra payment to confirm it reduced the principal balance.
Why Overpaying Your Mortgage Is the Best Risk-Free Return
📊 Data sourced from publicly available mortgage amortization formulas. See our methodology page for calculations and assumptions.
Every extra dollar you pay toward mortgage principal earns a guaranteed, tax-free return equal to your mortgage interest rate. If your mortgage is at 6.5%, an extra $100/month earns 6.5% annual return—risk-free. No stock, bond, or savings account can match that on a risk-adjusted basis. A $200,000 30-year mortgage at 6.5% costs $253,000 in total interest. An extra $200/month cuts interest by $87,000 and pays off the loan 8 years early. Our calculator shows you exactly how much each extra dollar saves.Lump Sum vs Monthly Overpayments: Which Saves More?
A lump sum payment saves more interest because it reduces principal immediately, shortening every future compounding period. A $10,000 lump sum on a $200,000 6.5% mortgage saves roughly $25,000 in interest. The same $10,000 spread over 5 years as $167/month saves about $22,000—still substantial, but $3,000 less. The difference is the time-value of early principal reduction. If you have cash, lump sum beats monthly. But monthly overpayments are easier to sustain and still deliver 85-90% of the benefit.
Overpayment vs Investing: The Math
The decision between mortgage overpayment and investing depends entirely on your mortgage rate vs expected investment returns after taxes. A 6.5% mortgage overpayment = 6.5% guaranteed, tax-free, risk-free return. To beat that investing, you need an after-tax return above 6.5%. At a 25% marginal tax rate, that requires 8.7% pre-tax. The S&P 500 has historically returned ~10% before inflation, but with 15-20% annual volatility. Overpayment wins on a risk-adjusted basis for most people with mortgage rates above 5%. Below 4%, investing likely wins long-term. Between 4-5%, it's a personal decision based on your risk tolerance and timeline.
Watch Out for Prepayment Penalties
Some mortgages include prepayment penalties—fees charged if you pay off the loan too quickly. These are most common on subprime loans and certain ARMs originated before 2014. Under the Dodd-Frank Act, most conventional mortgages originated after 2014 cannot have prepayment penalties. Check your loan documents for "prepayment penalty" language before making large extra payments. Even if a penalty exists, it typically only applies to paying off the entire balance within 3-5 years of origination, not to partial extra payments.
EquityFlow Pick: Compare current refinance rates before overpaying
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