Extra Payment Loan Calculator
Compare a standard loan payoff with a loan payoff that includes extra monthly payments.
- Last reviewed
- July 8, 2026
- Cost
- Free to use
- Data
- Runs in your browser
Extra Payment Loan Calculator
Methodology
How this calculator handles inputs
This calculator uses the values you enter above and applies the formula explained in the guide below. Results update in the browser and are intended for quick planning, comparison, and sanity-checking.
- Use consistent periods, currencies, and units across inputs.
- Review any assumptions before using the result in a decision.
- Recalculate when rates, prices, tax rules, or business terms change.
Important note
This tool provides general planning information only. It is not tax, legal, financial, accounting, or investment advice. Check the current rules for your location and speak with a qualified professional before making a high-stakes decision.
Guide
How it works
Use this calculator to estimate how an extra monthly payment could change your loan payoff time and interest cost. It compares a standard loan schedule with a schedule that includes extra principal payments.
What this calculator does
The extra payment loan calculator compares standard payoff with extra-payment payoff.
It uses:
- loan amount
- annual interest rate
- loan term in years
- extra monthly payment
The result shows standard payoff time, new payoff time, and estimated interest saved.
How to use the extra payment loan calculator
Enter the loan amount, interest rate, term, and extra monthly payment. If you enter zero extra payment, the result should show no meaningful change.
Use this to test whether a small extra payment creates enough savings to justify the cash commitment.
Extra Payment Loan Formula
Standard payment = loan amortization payment
New monthly payment = standard payment + extra monthly payment
The calculator then simulates payoff month by month.
Example calculation
If:
- Loan amount = 25,000
- Annual interest rate = 7%
- Term = 5 years
- Extra payment = 100
Then:
New payment = standard payment + 100
The loan balance falls faster, reducing both payoff time and future interest.
What is an extra loan payment?
An extra loan payment is an amount paid above the required monthly payment. When applied to principal, it reduces the balance sooner.
This can shorten the loan and reduce interest, especially early in the term.
Interpreting your result
Look at interest saved alongside the added monthly cash outflow. Extra payments are useful only if they fit your broader budget.
When to use this calculator
Use this calculator when you want to:
- test principal prepayments
- estimate interest savings
- shorten loan term
- compare payoff scenarios
Common mistakes
Common mistakes include:
- not applying extra to principal
- ignoring prepayment rules
- draining emergency savings
- assuming all lenders process extra payments equally
FAQs
Do extra payments reduce interest?
Yes, when they reduce principal.
Should extra payments go to principal?
Usually yes if the goal is faster payoff and lower interest.
What if extra payment is zero?
The payoff should match the standard schedule.
Is this financial advice?
No. It is a planning estimate only.
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