Personal Loan Payoff Calculator — Small Loans, Fast Payoff
Built for personal, auto, and student loans rather than mortgages. Enter the balance, rate, and monthly payment from your statement, and see the exact payoff date plus what each extra amount per month would really save you. The defaults are a $8,000 five-year loan at 9% — change them to your own numbers.
Calculator
Results
| Year | As scheduled | With extras |
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What Each Extra Amount Saves You
Every row uses the same engine as the calculator above, on your balance and rate. On small high-rate loans the jump from one row to the next is steep, because each extra dollar retires principal that would otherwise have compounded at your rate for years.
| Extra each month | Loan paid off in | Time saved | Interest left | Interest saved |
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Why Small High-Rate Loans Respond So Fast
A mortgage spreads its interest over 360 payments, so each individual payment is mostly interest and only a little principal. A five-year personal loan does the same thing on a compressed schedule, and at a much higher rate. The result is that the interest share of what you pay is far larger.
Take a $15,000 loan at 24% over five years. The payment is $431.52, and over 60 payments you hand over $10,891.14 of interest on $15,000 borrowed — 72.6% of the principal in interest alone. Compare that with a $240,000 mortgage at 6.5% over 30 years, where interest over the full term is about 127% of the principal but spread across 30 years. The personal loan extracts its interest in five years, which is why attacking its balance pays off so quickly.
This is the entire reason the payoff order matters. Removing $1,000 of principal from a 24% loan saves roughly $240 a year in interest; the same $1,000 removed from a 4% loan saves about $40. Same dollar, six times the effect. If you have several debts and limited extra cash, the rate — not the balance — decides where the money does the most work.
Worked Example: The $8,000 Five-Year Loan
Balance $8,000, rate 9%, 60 months. The payment is $166.07 and the scheduled interest bill is $1,963.96. Here is what fixed extra amounts do, computed by the same engine as the calculator:
| Extra each month | Paid off in | Time saved | Interest saved |
|---|---|---|---|
| $25 | 51 payments | 9 months | $325.71 |
| $50 | 44 payments | 16 months | $557.05 |
| $100 | 35 payments | 25 months | $864.19 |
| $200 | 24 payments | 36 months | $1,193.79 |
| $300 | 19 payments | 41 months | $1,367.56 |
Notice the shape of this table. Going from no extra to $100 extra cuts 25 of 60 payments — the loan loses 42% of its life for a 60% increase in monthly outlay. Going from $100 to $300 extra cuts only 16 more months, costing three times as much per month. The first slice of extra money does the heaviest work; each later slice does less. That is why $50 a month sustained beats a $500 burst you abandon.
Should You Pay This Loan Off or Invest Instead?
Compare the loan rate with the after-tax return you can realistically earn. Paying off a 24% loan is a guaranteed 24% return on that money, risk-free and tax-free in effect, because you are no longer paying that rate. Almost no investment reliably matches that. Paying down a 4% loan is a guaranteed 4%, and a diversified portfolio has historically beaten that over long periods — but with real volatility and no guarantee over any given five-year window.
The dividing line is not a fixed number, but a practical one: above roughly the mid-single digits the loan almost always wins, because the return is certain and the risk is zero. Below that, it depends on your risk tolerance and how much liquidity you would give up. And the single most important constraint: never drain an emergency fund to pay a loan faster. A paid-off loan you had to re-borrow against at a worse rate is a loss, not a win.
If You Have Several Debts
Order them by interest rate and send every spare dollar to the top one. That is the avalanche method, and it minimizes total interest for a given amount of extra money. Once the highest-rate debt is gone, roll its entire payment into the next one — the payment stays the same while the target shrinks, which accelerates the later debts.
The alternative is paying the smallest balance first, which costs more interest but closes accounts sooner. The math always favors the highest rate; the snowball method only wins when early wins are what keeps you making payments at all. Both are covered in more detail on the Debt Snowball vs Avalanche page.
FAQ
How do I pay off a $8,000 loan faster?
Add a fixed extra amount to every payment. On $8,000 at 9% over five years the payment is $166.07 and the loan takes 60 payments with $1,963.96 of interest. Adding $100 a month ends it in 35 payments instead of 60 — 25 months earlier — and saves $864.19. Adding $200 ends it in 24 payments and saves $1,193.79.
Why do extra payments save more on small loans than on mortgages?
Because the rate is usually much higher and the balance much smaller. A 24% personal loan charges $10,891.14 of interest on a $15,000 balance over five years — 72.6% of the amount borrowed. Every extra dollar of principal removed at 24% blocks about twice the interest that the same dollar blocks at 12%, so the same monthly effort produces a far larger percentage saving.
Should I pay extra on a loan or invest the money instead?
Compare the loan rate against the after-tax return you can realistically earn. Paying off a 24% loan is a guaranteed 24% return with no market risk, which almost nothing else reliably matches. Paying off a 4% loan is a guaranteed 4%, and a diversified portfolio has historically beaten that over long periods, though with real risk. The higher the rate, the stronger the case for the loan.
Does paying extra hurt my credit score?
Paying principal early does not hurt a score. Closing the account does, briefly, by shortening your credit history and lowering total available credit. The score effect of paying the balance down while keeping the account open is neutral to positive, mainly because it lowers your credit utilization ratio.
Which debt should I pay extra on first?
The highest interest rate first — the avalanche method — because it minimizes total interest for a given amount of extra money. Paying the smallest balance first costs more interest but closes accounts faster, which some people need for motivation. The math favors the rate; behavior sometimes favors the balance.
Do personal loans have prepayment penalties?
Some do. Unlike most modern mortgages, personal loan contracts vary widely and a minority include prepayment penalties or minimum interest charges. Read your contract or ask the lender what happens if you clear the balance early, and check whether any penalty exceeds the interest you would save.
Related Tools
For a mortgage rather than a small loan, the Loan Payoff Calculator solves the payoff date from your statement balance and payment. To model a fixed extra amount with a year-by-year balance table, use the Extra Payment Calculator, and for half-payments every two weeks see the Biweekly Mortgage Calculator. If a payment you sent did not reduce the balance, read why an extra payment may miss principal. The AmortWise homepage lists every tool and the terms of use explain how to read these estimates.