Everyday tool · ≈ 2 min · Home & mortgage
Mortgage Payoff Calculator
See how extra monthly or one-time payments shorten your mortgage and cut total interest.
Showing example defaults — change any input to use your own
Acceleration payoff
Interest saved with your extra payments
$54,360
Adding $200/month pays the loan off in 19 yr 1 mo instead of 23 yr 5 mo — 4 yr 4 mo sooner.
- Payoff on the current schedule
- 23 yr 5 mo
- Payoff with extra payments
- 19 yr 1 mo
- Time saved
- 4 yr 4 mo
- Interest on current schedule
- $253,648
- Interest with extra payments
- $199,288
Total interest: current vs. accelerated
View data table
| Total interest | |
|---|---|
| Current plan | $254K |
| With extra | $199K |
What this may mean for you
Every extra dollar here earns a guaranteed 6.25% by canceling future interest. Whether that beats investing the same dollars depends on your alternatives and taxes — but as risk-free returns go, it's hard to argue with, and entering retirement without a mortgage lightens the load your portfolio must carry.
Results are estimates for educational purposes and may not reflect your complete financial or tax situation.
Understanding this calculator
Every extra dollar against principal skips ahead in the amortization schedule and cancels all the interest that dollar would have generated — a guaranteed, tax-free return equal to your mortgage rate. At 6–7%, that's a return most bond portfolios envy, which is why "pay extra or invest?" is a genuinely close call for many households.
Entering retirement mortgage-free is partly math and partly peace of mind: a paid-off house shrinks the monthly income your portfolio must produce, cutting sequence-of-returns risk. The counterargument — liquidity and possibly higher investment returns — is real too. This calculator gives you the interest-and-time side of the ledger precisely.
Assumptions and methodology
- Simulates your current balance, rate, and payment monthly; extra amounts apply straight to principal.
- The one-time payment applies immediately; interest saved is the difference in lifetime interest between the two schedules.
- Assumes a fixed rate and no recasting; prepayment penalties (rare today) are not modeled.
Official sources
Last reviewed August 30, 2026. Year-specific figures show their tax or data year in the tool; data is reviewed when the IRS, SSA, and CMS publish annual updates.
Common questions
Should I pay off the mortgage or invest?
Compare your rate against what you'd realistically earn after tax and risk. There's no universal answer — paying down is a guaranteed return; investing has higher expected but uncertain returns. Many people split the difference.
Do extra payments lower my monthly bill?
No — they shorten the loan. The required payment stays the same until payoff (unless you formally recast).
Next step
See how this fits your whole retirement
One number is a start. The plan builder puts income, spending, savings, and taxes together year by year — free, no account, and every answer can be changed later.
Keep going
- Mortgage PaymentEstimate your full monthly payment — principal, interest, taxes, insurance, HOA, and PMI — plus total interest over the loan.Calculator
- Snowball vs. AvalancheBuild a payoff plan across all your debts and compare the avalanche and snowball methods.Calculator
- Income GapCompare your expected retirement expenses with your guaranteed income and see how much your savings need to cover.Calculator
- Preparing for Your First Year of RetirementThe twelve-month runway: money moves, paperwork, and the parts nobody mentions.Guide
- The First Year of Retirement: What Actually Surprises People6 min readArticle
Want a professional's take? Downshift can introduce you to a financial advisor, CPA, or retirement planner who can talk through what these numbers mean for you — free to you, no obligation.
Talk to a specialist