Mortgage Payoff Calculator: How Much Do Extra Payments Actually Save?
How much faster can you pay off your mortgage?
Mortgage Payoff Calculator
Interest Savings · Balance Decline · Equity Growth · Extra Payment Scenarios
Results update in real time as you adjust any input.
Your Mortgage
Extra Payments
Each $ earns 6.75% guaranteed return
Tax refund, bonus, or savings
Results are estimates only and do not constitute financial, tax, or legal advice. Consult a qualified professional before making financial decisions.
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Your mortgage is probably the largest debt you'll ever carry — and the most expensive if you let it run to term. A $400,000 mortgage at 7% for 30 years doesn't cost $400,000. It costs $957,000 in total payments: $557,000 in interest alone. The good news is that extra principal payments have an outsized impact, especially early in the loan when your balance is highest. Adding just $200/month to principal on that same mortgage cuts the payoff from 30 years to about 24 years and saves over $90,000 in interest. Adding $500/month cuts it to 21 years and saves $170,000. The math compounds in your favor because every dollar of principal you eliminate today eliminates all the interest that would have accrued on it for decades. This calculator takes your current mortgage balance, rate, and remaining term and shows you exactly what different extra payment amounts do — in months saved, interest avoided, and a clear new payoff date. It also shows your amortization curve so you can see how quickly your equity builds with vs. without extra payments. Whether you're considering bi-weekly payments (which add one extra monthly payment per year), a fixed extra monthly amount, or a lump-sum payoff, this tool shows the precise impact. Use it to answer the question every homeowner eventually asks: should I pay down the mortgage faster, or invest the money instead?
- →You received a bonus or tax refund and want to know how much it would cut your mortgage
- →Considering making bi-weekly instead of monthly payments to accelerate payoff
- →Evaluating whether to pay down your mortgage or invest the extra funds
- →You refinanced and want to understand how extra payments affect the new loan
- →Planning to be mortgage-free by retirement and calculating required extra payment
Robert has a $320,000 mortgage at 6.75% with 26 years remaining. His mandatory payment is $2,076/month. He's considering adding $300/month extra. The calculator shows: without extra payments, he pays $369,000 in remaining interest and is debt-free in 2050. With $300 extra, he's done 6 years earlier (2044), saves $87,000 in interest, and builds equity $87,000 faster. Robert sets up the extra payment immediately.
Does my lender automatically apply extra payments to principal?
Not always. You must specify that extra payments should go to principal, not future payments. Call your servicer or check their online portal for a 'principal-only payment' option. Some servicers automatically apply extras to principal; others apply them to the next payment first. Verify or you could overpay interest for years without the benefit you expected.
Are bi-weekly payments better than monthly?
Yes — bi-weekly payments result in 26 half-payments per year (equivalent to 13 full monthly payments vs. 12). That extra payment per year is automatically directed to principal and typically cuts 4–6 years off a 30-year mortgage. Many servicers offer bi-weekly autopay. Just confirm the extra payment applies to principal.
Should I pay extra on my mortgage or invest the money?
The mathematical answer: if your expected investment return (e.g., 7–9% historical stock market average) exceeds your mortgage rate, investing wins on paper. But the risk-adjusted answer depends on your risk tolerance. Paying down a 7% mortgage is a guaranteed 7% return. Stock returns are variable. Many advisors suggest doing both: max retirement accounts first, then direct remaining surplus to mortgage.
Can I refinance instead of making extra payments?
Refinancing to a shorter term (e.g., 30 to 15 years) forces paydown through a higher required payment and typically secures a lower rate. But it requires qualification, closing costs ($3,000–7,000), and locks you into the higher payment. Extra payments on your current loan give the same payoff flexibility without the cost or obligation — you can stop anytime.
Does paying off my mortgage early affect my taxes?
If you itemize deductions, paying off faster reduces your mortgage interest deduction — which may slightly increase your tax bill. However, the interest you save almost always exceeds the tax benefit you lose. The mortgage interest deduction is worth at most your marginal rate × interest paid (typically 22–32 cents per dollar). You still save 68–78 cents on every dollar of interest eliminated.