Frequently asked questions
The questions readers actually arrive with. Calculator-specific questions live on the calculator pages.
How does a payoff calculator work?
The amortization formula gives the fixed monthly payment, then the schedule splits each month between interest and principal. Extras land entirely on principal. Every PayoffMath calculator works this way for whatever numbers you put in.
Does paying extra actually save interest?
Yes. Extra principal reduces every future month's interest charge, so the savings compound. How much depends on your loan — try your own numbers in the payoff calculator for your loan type under Calculators.
Will paying off early hurt my credit score?
Closing the account can cause a short-term dip — it shortens your average account age and changes the mix of accounts on your credit report. The size of the dip depends on the rest of your file. FICO's own pages explain the factors. Most borrowers find the interest saved is worth the temporary score effect — but if a near-term mortgage application matters, talk to your loan officer first.
Payoff amount vs. current balance — what's the difference?
Current balance is principal still owed. Payoff amount is current balance plus interest accrued since your last statement, plus any prepayment penalty. Don't send a final lump sum until you have a dated payoff quote from your lender.
Is there a penalty for paying off early?
Depends on your loan agreement. Most large national personal-loan lenders don't charge one. Smaller banks, credit unions, and some auto/RV lenders sometimes do. Read the disclosure or call the servicer before a big lump sum.
Lump sum vs. extra monthly — which is better?
Lump sums save more per dollar (the money hits principal earlier). Monthly extras are easier to keep up. Both scenarios are in each payoff calculator — switch between them to compare.
Do biweekly payments work for personal loans?
Sometimes. Biweekly schedules add one extra full payment per year if the servicer applies each half to principal as it arrives. Some servicers hold the half-payment until the full one shows up — that neutralizes the benefit. Ask the servicer directly.
Does this work for auto loans, student loans, business loans, or mortgages?
Yes. The underlying math is the same for any fixed-rate loan with monthly payments — only the typical numbers shift (term length, rate range, balance). Dedicated pages with realistic defaults and the program-specific details that matter live under the Calculators link in the nav, including auto, student, SBA, small business, and mortgages.
Written by James L. Wu. I've spent more than a decade looking at personal-loan paperwork and most of what makes consumer credit confusing hides in fine print this site tries to surface. None of this is financial advice. The math is the math; what you do with it is up to you. See methodology, editorial policy, and disclosures for how the math + numbers are sourced. Last updated May 2026.