Early Loan Payoff Calculator
This early loan payoff calculator shows what happens when you add a fixed extra amount to every monthly payment on a loan or mortgage. Enter your outstanding balance, the annual interest rate, the years left on the loan and how much extra you can afford each month, and it instantly estimates the total interest you would save and how many months earlier the loan would be fully repaid. Even a modest extra payment can make a surprising difference, because every additional dollar goes straight to the principal and stops accruing interest for the rest of the term. It is ideal for comparing scenarios before you commit and for deciding whether overpaying your loan is worth it.
Interest saved
Months paid off earlier
New payoff time (months)
Interest without extra
Interest with extra
Assumes the extra amount is paid every month and goes entirely toward reducing principal; ignores prepayment penalties or fees — check your contract.
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How it works
The calculator first works out your standard monthly payment from the balance, rate and remaining term using the amortization formula, then simulates two repayment schedules month by month. In the base schedule you pay only the standard amount, and it adds up every interest charge until the balance reaches zero. In the second schedule it adds your extra payment to each installment: because the balance falls faster, less interest accrues and the loan is cleared in fewer months. The difference between the two total-interest figures is your interest saved, and the difference in the number of months is how much sooner you become debt-free. Paying extra early in the term saves the most, since that is when the balance — and the interest on it — is largest.
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Preguntas frecuentes
- How much does one extra payment a month really save?
- It depends on your balance, rate and how many years remain, but the savings are usually much larger than the extra you pay. Because each extra amount reduces the principal, you avoid interest on that money for every remaining month. On a long mortgage, even a small monthly extra can save tens of thousands in interest and cut years off the term.
- Is it better to make extra payments early or late in the loan?
- Early. At the start of a loan the balance is at its highest, so most of each payment goes to interest. Extra payments made early reduce that large balance and stop it from generating interest for the whole remaining term, which is why the same extra amount saves far more in year one than in the final year.
- Does the extra payment go entirely to principal?
- This calculator assumes yes — the whole extra amount reduces the principal. In practice you should tell your lender to apply overpayments to principal, not to future installments, and confirm there is no prepayment penalty. Some loans charge a fee for paying early, which this tool does not include.
- Should I pay off my loan early or invest the money instead?
- Paying extra gives a guaranteed return equal to your loan rate. If you can reliably earn more after tax by investing, investing may win; if not, or if you value being debt-free and reducing risk, overpaying is often the safer choice. This calculator shows the interest side so you can compare.
- What if my extra payment amount changes over time?
- This calculator assumes the same extra amount every month for simplicity. If your overpayments vary, treat the result as an estimate: paying more in some months speeds things up further, while skipping months slows it down. Re-run the numbers with an average extra to get a realistic middle-ground figure.