Loan Payoff Calculator
Inputs
Results update liveInterpretation
How Loan Payoff Planning works
The calculator compares the required payment by itself with a plan that adds the extra monthly payment and one immediate lump sum. It applies interest monthly to the remaining balance, then applies the payment to interest and principal.
Example
Key features
A realistic scenario showing how the calculation guides a practical decision.
Formula
Monthly interest = remaining balance × annual rate ÷ 12. Principal paid = payment − monthly interest.
- Compare required and accelerated payoff plans
- Model a recurring extra payment and one immediate lump sum
- Inspect an amortization schedule and download it as CSV
- See when a stated payment does not reduce the balance in this model
Watch out
Common mistakes
- Check whether a faster payment survives an ordinary month. Confirm your lender's prepayment rules, fees, and payment application before sending extra principal.
Related tools
Adjacent decisions
FAQ
Frequently asked questions
How the calculation works and where its limits are.
How does adding extra monthly payments shorten loan payoff time?
Every extra dollar applied directly to loan principal reduces the total balance on which subsequent interest is calculated. This accelerates amortization and reduces both the remaining term and total interest paid.
Should I make extra monthly payments or one annual lump-sum payment?
Making extra monthly payments immediately reduces the balance and saves more compound interest than waiting to make an equivalent annual lump sum at the end of the year.
Do lenders charge prepayment penalties for paying off loans early?
Most modern personal, auto, and conventional mortgage loans do not have prepayment penalties. Check your original promissory note or loan disclosure agreement to verify.
Is this loan payoff calculator financial or legal advice?
No. All outputs are deterministic amortization formulas based on standard CFPB disclosure methods and your entered parameters.
What should I do after modeling my loan payoff acceleration?
Model multiple debts together using our Debt Payoff Calculator (Snowball vs Avalanche) to prioritize highest APR obligations.