Personal Loan Payoff Calculator
See your personal loan amortisation month-by-month. Add extra payments and watch the payoff date jump forward and the lifetime interest drop. Free.
Personal Loan Payoff Calculator
Enter your personal loan. Add an extra monthly payment to see how much sooner you pay off the loan and how much interest you save. Pure amortisation math — works for personal, auto, student, and most installment loans.
First 24 months
| Month | Payment | Interest | Principal | Balance |
|---|---|---|---|---|
| Loading… | ||||
How to Use the Personal Loan Payoff Calculator
Enter your current balance, rate, and remaining term
All three are on your loan statement. Use the current outstanding balance (principal), the note rate (APR), and the years remaining — not the original loan terms.
Set an extra monthly payment
Even an extra USD 50-100/month dramatically shortens the loan and cuts interest. The summary shows the months and interest you save at that extra rate. Set it to 0 to see the original amortisation only.
Read the summary card
The tool shows base monthly payment, actual monthly payment (with extra), the original payoff date, the new accelerated payoff date, months saved, and lifetime interest saved. The accelerator effect is largest in the early years.
Check the amortisation table
The first 24 months show the month-by-month split between interest and principal — interest is heavy at the start and falls as the balance reduces. Print this table and pin it on the wall as accountability.
How Personal Loan Amortisation Actually Works — and Why Extra Payments Hit So Hard
Reducing-Balance Amortisation: The Math Lenders Don't Explain
Every US personal, auto, and student loan uses reducing-balance amortisation. Each month, interest is computed on the current outstanding balance — not the original loan amount — and your monthly payment covers both interest and a chunk of principal. As the balance falls, the interest portion of each payment falls and the principal portion grows. This is why early in the loan, most of your payment is going to interest; late in the loan, most is going to principal. The Truth in Lending Act (Regulation Z) requires US lenders to disclose this amortisation schedule, but most consumers never look at it.
Here's the counterintuitive consequence: on a USD 18,000 / 11.5% / 5-year personal loan, the first month's payment of USD 395 includes USD 173 of interest and USD 222 of principal. By month 30 (halfway through), the same USD 395 payment is USD 96 interest and USD 299 principal. The "interest tail" is heaviest at the start of every amortising loan.
Why Extra Payments Work Disproportionately
When you make an extra USD 100 payment in month 1, the lender applies it directly to principal — which means the next month's interest is computed on a USD 100 lower balance. That saves you interest every month for the remaining life of the loan. The compounding effect is significant: USD 100 extra per month on the example loan above shortens the term by 13 months and saves USD 1,170 in interest over the life of the loan, on a loan that totals only USD 5,700 in original interest. That's a 21% reduction in interest cost for an extra 25% of monthly cash flow.
The earlier in the loan the extra payment lands, the larger the savings. Extra payments in year 1 compound for the full remaining term; extra payments in year 4 only have one year left to compound. Annual lump-sum bonuses applied to principal in January will outperform the same amount paid in December. If your loan has no prepayment penalty (most US conforming personal loans don't, per the CFPB), every dollar of extra payment is mathematically guaranteed to save you more than a dollar over the life of the loan.
"An extra USD 100/month on a 5-year USD 18,000 personal loan at 11.5% pays the loan off 13 months early and saves USD 1,170 in lifetime interest — a 21% interest reduction for a 25% increase in monthly cash."
When Not to Pay Extra
The math says always pay extra; reality is more nuanced. Don't accelerate a 6% loan if you carry 24% credit card debt — pay the card first. Don't pay extra to the lowest-rate debt while higher-rate debt is outstanding (the "debt avalanche" rule). Don't deplete your emergency fund to pay down loans — the rule of thumb is keep 3-6 months of essential expenses liquid before accelerating any non-emergency debt. And don't make extra payments without verifying with your lender that they're being applied to principal rather than advancing your next due date — some servicers default to the latter unless you specifically instruct them otherwise.
For US borrowers with an old loan at a rate above current market rates, refinancing into a fresh lower-rate loan can outperform extra payments. A USD 18,000 / 11.5% loan refinanced to 7.5% saves over USD 1,800 in interest with no extra cash outlay. Run both scenarios — refinance vs accelerated payoff — and pick the larger savings. Some borrowers do both: refinance to a lower rate, then accelerate the new loan.
10 Facts About Personal Loan Payoff
US personal loan APRs range from 6% (excellent credit) to 36% (subprime) — the same product can have a 6× rate spread based purely on FICO score.
Most US conforming personal loans have no prepayment penalty — every extra dollar of payment goes directly to principal reduction.
The Truth in Lending Act (Regulation Z) requires US lenders to disclose the full amortisation schedule before you sign the loan.
An extra USD 100/month on a 5-year USD 18,000 / 11.5% loan pays it off 13 months early and saves USD 1,170 in interest.
Early payments have compounding benefit — an extra USD 1,000 in year 1 saves more total interest than the same USD 1,000 in year 4.
The "debt avalanche" method pays down the highest-rate debt first while making minimum payments on lower-rate debts — mathematically optimal.
The "debt snowball" method pays down the smallest balance first regardless of rate — psychologically easier, lifetime interest cost slightly higher.
US credit card APRs average 22-28% in 2026 — always prioritise card payoff over personal loan acceleration if both exist.
EU consumer credit under Directive 2008/48/EC caps early-repayment compensation at 0.5-1% of the prepaid amount — making EU payoffs structurally cheap.
The Consumer Financial Protection Bureau recommends always confirming with your servicer that extra payments are applied to principal — some default to advancing due dates instead.
Frequently Asked Questions
-
US personal loans use reducing-balance amortisation. Each month, interest is computed on the current outstanding balance: monthly interest = balance × (APR ÷ 12). Your monthly payment covers that interest plus a chunk of principal. As principal falls, the interest portion of subsequent payments falls and the principal portion grows. The Truth in Lending Act requires lenders to disclose the full amortisation schedule before signing — the tool above reproduces that calculation.
-
Not always — verify with your servicer. Some US loan servicers default to applying extra payments forward (advancing your next due date) rather than to principal. The CFPB explicitly recommends checking your servicer's policy and explicitly instructing them to apply extras to principal. Many lender web portals have a check-box for "apply additional payment to principal". If they refuse, refinance with a lender who doesn't play this game.
-
Most major US personal loan providers (SoFi, LightStream, Marcus, Wells Fargo, Discover) charge no prepayment penalty. The exceptions are typically older auto loans, some non-QM mortgages, and certain subprime personal loans — check the loan note. The Dodd-Frank Act significantly restricted prepayment penalties on qualified mortgages, but personal loans aren't covered by that protection. The CFPB recommends comparing the prepayment terms when shopping loan offers — it's section 4 of the Truth in Lending disclosure.
-
The debt avalanche pays minimums on all debts and puts every extra dollar toward the highest-rate debt — mathematically optimal, lowest total interest. The debt snowball pays minimums on all and attacks the smallest balance first regardless of rate — psychologically easier because you eliminate accounts faster and feel progress. Avalanche saves more money; snowball helps people stick with the plan. The difference for typical consumer debt portfolios is 5-15% of total interest — meaningful but not enormous. See our Debt Snowball vs Avalanche Calculator for a side-by-side.
-
Compare the loan's APR to the after-tax return you can realistically expect from investing. A guaranteed 11.5% saving (loan APR) beats a probabilistic 7% market return after taxes — even though the headline numbers look closer, the guaranteed-vs-probabilistic distinction matters. Rule of thumb: pay off any debt above 6-7% APR before investing in taxable accounts; tax-advantaged retirement contributions (401(k) match especially) generally outrank even high-rate debt because the match is an instant 50-100% return. Always pay off credit card debt (22-28% APR) before any other competing use.
-
Yes — the math is identical. US auto loans, federal student loans, and private student loans all use reducing-balance amortisation. The differences are around fees and prepayment terms: federal student loans never have prepayment penalties; auto loans rarely do; private student loans occasionally do (check the note). The tool above treats them all the same — enter the balance, rate, and remaining term and add any extra payment.
-
Each row is one month. "Payment" is your total monthly outflow (base EMI + extra). "Interest" is what the lender keeps. "Principal" is what reduces your balance. "Balance" is what's left after that month's payment. Notice how the interest column shrinks and the principal column grows over time — that's the reducing-balance mechanic. The table is generally most useful for the first 24 months where the split shifts most.
-
Depends on the rate gap. If your current loan is 11.5% and you can refinance into 7.5%, the refinance saves USD 1,800+ in interest with no extra cash outlay. If you're already at 7% and current market rates are 7.5%, refinancing won't help — accelerated payments are the path. Often the best approach is to do both: refinance to a lower rate first, then apply extra payments to the new loan. Use our Loan Comparison Calculator to compare offers and then come back here to model accelerated payoff on the new loan.
-
The amortisation math is universal but the prepayment regime differs. US conforming personal loans generally have no prepayment penalty. Singapore and Malaysia bank personal loans often have a 1-3% early-repayment fee in the first 1-2 years of the loan, after which prepayment is free. Indonesian and Philippine personal loans frequently use "flat" interest calculation (interest computed on the original principal rather than reducing balance), making prepayment savings smaller than the headline rate suggests. If you have a flat-rate Asian loan, the effective reducing-balance APR is roughly 1.8-2.0× the flat rate — use our Loan EMI Calculator for the reducing-balance comparison.
-
Run both scenarios. US federal student loan rates have ranged from 4.5% to 7.5% in 2020-2026 — generally below long-run equity returns. Federal loans also have income-driven repayment plans and Public Service Loan Forgiveness that can be valuable if your career path qualifies; private student loans rarely have these protections. Specific to ASEAN expats: if you might return home, currency-flow risk is real — a strengthening SGD vs USD makes your USD loan cheaper in SGD terms over time, weakening the case for aggressive payoff. If you're staying in the US long-term, treat private student loans like any other 6-8% loan: pay off above-market rates, refinance below-market rates, accelerate after the emergency fund is built.
Related News
You may be interested in these recent stories from our newsroom.
-
Snowflake jumps 36 per cent in a day on an earnings beat and a US$6 billion AWS chip deal
Snowflake had its best day as a public company on 28 May, closing up 36 per cent after a clean first-quarter beat and a five-year, US$6 bill...
-
MAS Scraps Mandatory Financial Advice for Most Complex Product Buyers in Retail Shake-Up
Singapore retail investors buying structured notes, derivatives and investment-linked policies will no longer need mandatory financial advic...
-
SEC Rewrites Float Rules, PSE Moves to Implement Them — Clearing the Path for GCash's USD 1B Philippine IPO
The SEC lowered the public float floor for large Philippine issuers in February 2026. The PSE followed with a consultation paper in April. T...
75 more free tools
Calculators, converters, security tools — no signup.