How does paying off a mortgage early work?
A mortgage is a fully amortizing loan: each monthly payment covers that month’s interest first, and only the rest chips away at the balance. Early on, most of your payment is interest. Any extra you pay skips that split and goes 100% to principal, which shrinks the balance, lowers every future interest charge, and pulls your payoff date forward. On a $350,000 balance at 6.5% with 30 years left, paying just $200 extra a month clears the loan 6 years 2 months sooner and saves about $108,000 in interest.
Is an extra monthly payment or a one-time lump sum better?
Both help, and earlier is always better because the saved interest compounds for longer. A steady monthly extra is the most powerful lever over time: on that same $350,000 loan, $100 a month saves about $63,000, while $500 a month saves about $194,000 and cuts more than 11 years off the term. A one-time lump sum — a tax refund or bonus — makes the biggest dent the sooner in the loan you apply it. When you send extra, tell your servicer to apply it to principal, or it may sit as a prepayment of your next bill instead (CFPB).
When is paying off your mortgage early not the best move?
Extra payments are a guaranteed return equal to your mortgage rate — a 6.5% loan is like earning 6.5% risk-free. But pay off higher-cost debt first: credit cards near 20%+ APR beat any mortgage payoff. Capture your full 401(k) match and build an emergency fund before overpaying, and check for any prepayment penalty on your note. Money sent to principal is also locked in the house until you sell or refinance, so keep enough liquid cash for the unexpected.
How to pay off your mortgage early, step by step
- 1
Enter your current loan balance. Use the balance you owe today, not the original loan amount. Your latest mortgage statement shows it.
- 2
Add your interest rate and years remaining. Enter the APR from your note and how many years are left. A $300,000 balance at 6.5% with 30 years left runs about $1,896 a month in principal and interest.
- 3
Choose an extra payment. Add a fixed amount to every payment, a one-time lump sum, or both. Every extra dollar goes straight to principal.
- 4
Read the payoff and interest saved. The calculator shows your new payoff date, how many years sooner you finish, and the total interest you avoid.
Mortgage payoff reference tables
How much an extra payment saves at different amounts and rates, plus the latest average U.S. mortgage rates.
How much an extra monthly payment saves ($350,000 at 6.5%, 30 years left)
Adding a fixed amount to every payment shortens the loan and cuts the interest sharply, because every extra dollar goes straight to principal. This is a $350,000 balance at 6.5% with 30 years remaining (a $2,212/mo principal-and-interest payment).
| Extra per month | New payoff time | Time saved | Interest saved |
|---|---|---|---|
| +$50 | 28 yrs 1 mo | 1 yr 11 mos | $34,081 |
| +$100 | 26 yrs 6 mos | 3 yrs 6 mos | $62,627 |
| +$200 | 23 yrs 10 mos | 6 yrs 2 mos | $108,097 |
| +$300 | 21 yrs 9 mos | 8 yrs 3 mos | $142,994 |
| +$500 | 18 yrs 7 mos | 11 yrs 5 mos | $193,603 |
Source: Socko calculation: amortization of $350,000 at 6.5% over 30 years with each extra payment.
Interest saved by your rate ($300,000, 30 years, +$200/month)
The same extra payment saves more when your rate is higher, because you avoid more expensive interest. This is a $300,000 balance over 30 years with an extra $200 a month, across a range of rates.
| Interest rate (APR) | Interest without extra | Interest saved | Time saved |
|---|---|---|---|
| 4% | $215,609 | $50,412 | 6 yrs 3 mos |
| 5% | $279,767 | $69,210 | 6 yrs 5 mos |
| 6% | $347,515 | $91,173 | 6 yrs 9 mos |
| 7% | $418,527 | $116,640 | 7 yrs 2 mos |
| 8% | $492,466 | $145,906 | 7 yrs 6 mos |
Source: Socko calculation: amortization of $300,000 over 30 years at each APR, with and without an extra $200/month.
Average U.S. mortgage rates and what they cost per $100,000
The rate and term you start from set how much extra payments can save. These are the latest weekly U.S. averages from Freddie Mac (week of June 18, 2026); the payment and interest columns are what each rate costs per $100,000 borrowed.
| Loan type | Average rate | Monthly P&I per $100k | Total interest per $100k |
|---|---|---|---|
| 30-year fixed | 6.47% | $630 | $126,835 |
| 15-year fixed | 5.81% | $834 | $50,053 |
Source: Freddie Mac, Primary Mortgage Market Survey (week of June 18, 2026)
Frequently asked questions
How much sooner can I pay off my mortgage with an extra $200 a month?
On a $350,000 balance at 6.5% with 30 years left, $200 extra a month pays it off about 6 years 2 months sooner and saves roughly $108,000 in interest. Enter your own figures for an exact result.
Does paying extra on my mortgage reduce the principal or the interest?
It should reduce principal — and a smaller principal means less interest every month after. Tell your servicer to apply the extra to principal, or it may just be credited toward your next payment.
Is it better to make one extra payment a year or pay a little extra each month?
Both help — earlier is better. A monthly extra slightly beats a year-end lump because it cuts the balance sooner. One extra payment a year ≈ adding 1/12 of your payment every month.
Should I pay off my mortgage early or invest the money instead?
Extra payments are a guaranteed return equal to your rate (6.5% loan ≈ 6.5% risk-free). First clear high-interest debt, get your full 401(k) match, and build an emergency fund — then weigh payoff vs. investing.
Will paying extra lower my monthly mortgage payment?
No — your required payment stays the same; you just finish sooner. To lower the monthly payment you would need a recast or a refinance.
Does this calculator include property taxes, insurance, and PMI?
No — it uses principal and interest only. Taxes, insurance, and PMI sit in escrow and aren’t reduced by extra payments (though enough principal can cancel PMI sooner).
Is there a penalty for paying off my mortgage early?
Usually not, but some loans charge one. Check your note or ask your servicer before a large extra payment — federal rules limit prepayment penalties on most qualified mortgages.
Is the Mortgage Payoff Calculator free, and is my data saved?
Yes — it is free and runs entirely in your browser. Nothing you enter is sent or stored.
This tool is for estimation and education, not financial advice. See our methodology for how these figures are calculated and sourced.