Mortgage Payoff Calculator 2026
See exactly how many years and how many thousands of dollars you save by adding extra to your mortgage payment, dropping a lump sum, or both. Real numbers based on your actual loan.
Last updated April 2026 · Sources: Freddie Mac PMMS, CFPB Qualified Mortgage rules, Federal Reserve G.19
Your loan
Your savings
Extra payment scenarios — $300K balance, 25 years left at 6.46%
| Strategy | Years saved | Interest saved |
|---|---|---|
| No extra payments | 0 | $0 |
| +$100/month | 2.7 years | $38,340 |
| +$200/month | 4.8 years | $67,404 |
| +$500/month | 9.1 years | $124,501 |
| Biweekly equivalent (1 extra pmt/yr) | ~4.5 years | ~$62,000 |
Frequently Asked Questions
How much do I really save by adding $200 a month to my mortgage?
On a typical $300,000 balance with 25 years left at the current 6.46% rate, an extra $200 per month pays the loan off about 4.8 years early and saves roughly $67,400 in interest. The exact savings depend on your remaining balance and rate, but the rule of thumb is that early extra payments save dramatically more than late ones because you're cutting interest off the front of the amortization curve.
Is it better to pay extra each month or make one big lump sum?
A lump sum applied early has the biggest impact per dollar because every dollar of principal you knock down today stops accruing interest for the entire remaining loan life. But monthly extra payments are easier to sustain and more flexible if your income is inconsistent. Run both in the calculator above — most people find a hybrid (small monthly extra plus tax-refund lump sums) gives the best balance.
Should I pay off my mortgage early or invest the difference?
It depends on your mortgage rate versus expected investment returns and your risk tolerance. At 6.46% guaranteed return (paying off mortgage), you're competing against roughly 7% real long-term S&P 500 returns. The market wins on average over decades, but it's not guaranteed. Paying down your mortgage is risk-free, illiquid, and offers no tax deduction unless you itemize. Many financial planners suggest splitting: max retirement accounts first, then split surplus between extra mortgage and taxable investing.
Will my lender penalize me for paying off my mortgage early?
Federal law banned prepayment penalties on most residential mortgages originated after January 2014 under the Dodd-Frank Act's Qualified Mortgage rules. If your loan was originated before 2014 or is a non-QM loan, check your note for a prepayment clause. The penalty period typically expires after 3-5 years even when present.
Does paying extra principal lower my next monthly payment?
No — and this surprises a lot of borrowers. Extra principal payments reduce the loan term, not the required monthly payment. Your $1,800/month is still due next month even if you sent in $5,000 extra last week. The only way to lower your required monthly payment is to refinance or to formally request a "loan recast" from your servicer, which re-amortizes the remaining balance over the original term.
What is loan recasting and is it worth it?
A recast applies a lump sum to your principal and then re-amortizes your loan, lowering your required monthly payment without changing the rate or term. Most lenders charge $200-$500 for it and require a minimum lump sum (often $10,000+). It's a smart move if you want lower monthly payments without refinancing into today's higher rates and don't mind the equity being locked up.
Should I pay off my mortgage before retirement?
Most retirement planners say yes if you can do it without sacrificing tax-advantaged retirement contributions. Entering retirement debt-free dramatically reduces your required income, which lowers Social Security taxation, Medicare IRMAA surcharges, and the size of the nest egg you need. The downside: housing wealth is illiquid. Don't empty your 401(k) to pay off the mortgage — that triggers ordinary income taxes and possibly a 10% penalty.
How do I send extra payments so they actually go to principal?
Write "apply to principal" on your check memo or use the explicit principal-only option in your servicer's online portal. Some servicers default to applying extra funds to next month's payment, which doesn't accelerate payoff at all. After your first extra payment, check your statement to confirm the principal balance dropped by the full extra amount. If it didn't, call the servicer immediately.
Is biweekly payment the same as paying extra monthly?
Almost. A biweekly schedule means 26 half-payments per year, which equals 13 monthly payments instead of 12 — one extra payment annually. On a $300,000 30-year loan at 6.46%, that knocks roughly 5 years off the term and saves around $60,000 in interest. You can replicate this without enrolling in a biweekly program by adding 1/12 of your payment to each month's check.
Does paying extra hurt my credit score?
No. Paying down a mortgage helps your credit slightly by lowering your debt balances, though mortgages count less than credit cards in utilization scoring. There's no penalty in the credit scoring models for paying ahead of schedule. The only minor impact: when you pay the loan off entirely, you lose the open installment account, which can shave a few points temporarily.
What about the tax deduction I'll lose if I pay off my mortgage?
For most homeowners after the 2017 TCJA and 2025 OBBBA changes, this matters less than people think. The standard deduction is $32,200 for married couples in 2026, and the SALT cap rose to $40,000. Unless you itemize and have substantial mortgage interest plus other deductions exceeding $32,200, you're already taking the standard deduction and the mortgage interest provides no tax benefit. Run your last return through the math before letting the deduction influence your decision.
Should I pay extra on my mortgage or my high-interest debt first?
High-interest debt wins almost every time. Federal Reserve G.19 data shows the average credit card APR at 20.97%. Paying down a 20.97% debt is the equivalent of earning a guaranteed 20.97% return, which crushes the 6.46% you save by prepaying your mortgage. The order: high-interest debt (credit cards, payday loans), then employer 401(k) match, then a 3-6 month emergency fund, then mortgage prepayment competes with broader investing.
Sources: Freddie Mac PMMS (April 2 2026), CFPB Qualified Mortgage rules, Federal Reserve G.19 Consumer Credit, Dodd-Frank Wall Street Reform Act.
Disclaimer: Estimates only. Confirm prepayment terms with your loan servicer and verify how extra payments are applied to principal versus future installments.