Loan Overpayment Calculator
Runs locally in your browser. Nothing leaves your device.Compare loan term, interest and balance with and without one-off or recurring overpayments.
Compare a loan with and without overpayments.
Interest saved
$13,231.08
- Paid off earlier
- 23 months
- Term without overpayment
- 301 months
- Term with overpayment
- 278 months
- Interest without overpayment
- $100,598.58
- Interest with overpayment
- $87,367.51
Details and repayment schedule
| Year | Without overpayment | With overpayment |
|---|---|---|
| 1 | $194,919.01 | $184,563.34 |
| 2 | $189,657.30 | $178,933.31 |
| 3 | $184,208.45 | $173,103.04 |
| 4 | $178,565.80 | $167,065.40 |
| 5 | $172,722.45 | $160,813.02 |
| 6 | $166,671.28 | $154,338.27 |
| 7 | $160,404.89 | $147,633.23 |
| 8 | $153,915.62 | $140,689.71 |
| 9 | $147,195.54 | $133,499.23 |
| 10 | $140,236.45 | $126,053.01 |
| 11 | $133,029.85 | $118,341.94 |
| 12 | $125,566.94 | $110,356.62 |
| 13 | $117,838.59 | $102,087.29 |
| 14 | $109,835.36 | $93,523.84 |
| 15 | $101,547.49 | $84,655.81 |
| 16 | $92,964.84 | $75,472.38 |
| 17 | $84,076.93 | $65,962.31 |
| 18 | $74,872.91 | $56,114.01 |
| 19 | $65,341.52 | $45,915.43 |
| 20 | $55,471.14 | $35,354.12 |
| 21 | $45,249.69 | $24,417.17 |
| 22 | $34,664.70 | $13,091.23 |
| 23 | $23,703.24 | $1,362.46 |
| 24 | $12,351.91 | $0.00 |
| 25 | $596.84 | $0.00 |
| 26 | $0.00 | $0.00 |
Illustrative estimate. Contract rules, charges, rounding and rate changes may differ.
How it works
- 1
Enter loan details
Enter the remaining balance, interest rate, and current payment or remaining term.
- 2
Set the overpayment
Set a one-off and/or recurring overpayment with timing and effect.
- 3
Review the comparison
Review interest savings, time savings, and net benefit compared to the base plan.
Good to know
The loan overpayment calculator compares a loan with and without an extra payment directly in your browser. A one-off extra payment can be applied immediately before the first interest period or after a set number of regular payments; a recurring extra amount can also be scheduled with every payment or once per loan year.
Calculation runs locally in the browser. You can choose whether the overpayment should reduce the payment or shorten the term; an optional overpayment fee is subtracted from the benefit. Prepayment penalties and your contract's overpayment rights are not automatically included.
Typical use cases
Test the effect of a one-off overpayment
Simulate how a bonus or inheritance as an immediate or later overpayment affects term and interest.
Reduce the payment instead of shortening the term
Choose the option to keep the payment and shorten the term, or instead keep the term and lower the payment.
Tips for better results
Factor in the overpayment fee
If your loan contract charges a fee for overpayments, enable it in the calculator to see the actual net benefit.
Check overpayment rights in your contract
Before making an actual overpayment, check whether your contract allows it at the planned amount — this calculator only models the math.
Features
One-off and recurring overpayment
Combine a one-off extra payment with a recurring extra amount with every payment or once per loan year.
Shorten the term or lower the payment
Choose the effect of the overpayment that suits you.
Net benefit after fee
An optional overpayment fee is subtracted from the calculated benefit.
Frequently asked questions
Should I lower the payment or shorten the term?
Shortening the term usually saves more interest, lowering the payment improves monthly cash flow — the choice depends on your goal.
Are my inputs uploaded?
No. Calculation runs entirely locally in the browser.
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