Extra Payment Calculator
See how extra monthly payments or a one-time payment can shorten payoff time, reduce interest, and change your payoff date.
Your numbers
How this calculator works
This calculator compares your current payoff estimate with a version that includes an extra monthly payment, a one-time upfront payment, or both.
The model applies a one-time payment upfront, calculates monthly interest using APR ÷ 12, applies the regular and recurring extra payments, and compares payoff time, payoff date, total interest, and interest saved.
Results
Payoff comparison over time
What different extra payment amounts change
How much extra you should pay depends on the improvement you need and the amount you can sustain. Until you calculate, the examples below use the default numbers and change only the recurring extra payment.
| Extra payment | Total monthly payment | Estimated payoff time | Time saved | Interest saved |
|---|---|---|---|---|
| $25 | $250 | 44 months | 8 months | $708.72 |
| $50 | $275 | 39 months | 13 months | $1,204.52 |
| $75 | $300 | 34 months | 18 months | $1,572.26 |
| $100 | $325 | 31 months | 21 months | $1,856.55 |
When paying extra is worth it
An extra payment is most useful when it produces a meaningful drop in payoff time or interest without making the rest of the budget harder to manage. Compare the time saved and interest saved instead of judging the extra amount by itself.
Payoff time falls substantially
A longer remaining timeline gives extra payments more time to avoid future interest charges. If the extra payment removes a meaningful number of months or years, the higher payment is doing useful work.
Interest savings justify the payment
High-APR balances usually create the greatest opportunity for savings. Even when the payoff date moves less, a meaningful reduction in total interest can make the extra payment worthwhile.
The payment remains sustainable
The estimate assumes the extra amount continues until payoff. If that amount would force new borrowing or leave too little for normal expenses, use a smaller payment that can be repeated consistently.
If both the time and interest savings are modest, try a different extra amount or compare whether reducing the APR changes the result more.
Monthly extra payments and one-time payments don't do the same job
What a monthly extra payment changes
A monthly extra payment keeps steady pressure on the balance. It tends to matter most when the payoff timeline is still long and interest is still taking a noticeable share of each payment.
What a one-time payment changes
A one-time payment helps by cutting the balance sooner. It can have more impact than it first seems because the lower balance leaves less room for future interest to build.
Why using both can be stronger
Using both can create a better result because the one-time payment reduces the balance early and the monthly extra keeps pushing the balance down after that. When the budget can support it, that combination often does the most work.
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Learn more about when paying extra helps
These guides can help you judge when extra payments make a real difference, when interest is the bigger problem, and which changes are most likely to improve the result.