Mortgage Calculator with Extra Payments
Test monthly and lump-sum extra principal payments to compare payoff timelines and interest savings.
Why this page
Use this extra payment mortgage calculator to compare your baseline loan against monthly extra and one-time lump-sum strategies.
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Loan Inputs
Results
Extra Payment Impact
Estimate Disclaimer
Estimates only. Results are based on your inputs and may not reflect final loan terms, taxes, insurance, HOA dues, PMI rules, lender fees, or escrow adjustments. Confirm final numbers with your lender, servicer, and local tax/insurance sources before making financial decisions.
Amortization Table
| Month | Rate % | Begin Bal | Interest | Principal | Extra | PMI | PITI Outflow | End Bal |
|---|
Assumptions
- Estimate only. Excludes escrow shortages, lender fees, and refinance costs.
- For adjustable rate, future rates are user-entered assumptions.
- PMI uses original home value and stops when LTV reaches chosen threshold (default 78%).
Publisher Status
We are an informational publisher, not a mortgage lender, broker, or loan servicer.
FAQ
How much faster can I pay off with extra payments?
Extra principal payments reduce outstanding balance faster, which cuts interest and shortens your payoff timeline.
Do extra payments go to principal?
In most loan setups extra payments are applied to principal, but verify how your servicer applies additional payments.
Is monthly extra or lump sum better?
Both can reduce interest; the better option depends on amount, timing, and cash-flow flexibility.
Can I start extra payments later?
Yes. Changing the extra-payment start month still updates payoff date and interest savings.