D&B

Early payoff calculator

Adding $100.00/month to this debtworked example

1 yr 3 mo sooner

New payoff date
August 1, 2029
Interest saved
$989.41
Payoff date at the base payment
November 1, 2030
Total interest at the base payment
$3,206.10

Paying $400.00 instead of $300.00 clears $12,000 at 11.5% in 3 years instead of 4 yr 3 mo — 1 yr 3 mo sooner — and costs $2,216.69 in interest instead of $3,206.10, a difference of $989.41 in this scenario. Every extra dollar goes straight to principal, so it stops accruing interest for every remaining month.

See exactly what an extra monthly payment does to any fixed-payment debt: the months removed from the schedule, the interest avoided, and the new payoff date. Computed month by month on the declining balance, with the baseline and the accelerated schedule shown side by side.

How to use this calculator

  1. 1

    Start from your current statement, not the original loan

    Enter today's balance and today's payment. Months of payments have already changed both the balance and the interest-to-principal split, so the original loan amount would give you an answer to a question you are no longer asking.

  2. 2

    Try an extra you would genuinely notice but not resent

    The tool is at its most useful when you compare a few candidates — $25, $50, $100 — rather than optimizing one. Extra payments early do the most work, because they remove principal that would otherwise accrue interest for every remaining month.

  3. 3

    Read months saved before dollars saved

    Months are what you feel; dollars are what it costs. Both are shown because both matter, but the date moving is usually the more motivating half — and it is the half you can put in a calendar.

  4. 4

    Check your agreement for a prepayment penalty

    Credit cards never penalize early payment; some personal and auto loans do. That clause is a contract fact this calculator cannot see, so confirm it before committing to a plan built on these numbers.

Everything you type here is computed in your browser. Nothing you enter is stored on a server, sent anywhere, or shared — there is no account, and your balances never leave your device.

Frequently asked questions

How much does an extra $50 a month actually save?
It depends on the rate and the remaining term, which is why this is a calculator and not a rule of thumb. Every extra dollar goes straight to principal, so it stops accruing interest for every remaining month — extra payments early in a schedule do the most work, because they have the most months left to matter.
Is it better to pay extra monthly or in one lump sum?
A lump sum today beats the same total spread over the year, because principal removed sooner stops costing interest sooner. In practice, the payment you actually make beats the one you plan to make — run both shapes here and compare the payoff dates rather than optimizing a plan you will not keep.
Do some loans penalize early payoff?
Some do — prepayment penalties still exist on certain personal and auto loans, and your agreement is the only place to check. Credit cards never penalize early payment. This calculator shows the interest arithmetic only; a penalty clause is a contract fact it cannot see, and the page says so.
Does the extra payment change how my regular payment is split?
No. Each month's interest is computed on the balance; your regular payment covers it and retires some principal; the extra retires principal on top. The split between interest and principal improves every month precisely because the balance is falling faster.
How precise is the interest saved?
Both schedules run under the same stated convention — interest accrues monthly at APR divided by 12, rounded to cents after every step — so the difference between them is a like-for-like comparison. Card issuers compound daily, which makes real totals slightly higher than shown; the months removed are unaffected.

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