Debt Payoff Calculator
See how long it takes to clear a credit card or loan — and how paying it down can lift your mortgage approval odds.
By Onias Derilus, Mortgage Capital · NMLS# 1859012 · Last Updated: June 2026
If the payment is below the monthly interest, the balance never falls — raise the payment. Paying down high-rate debt also lowers your DTI for a mortgage. Estimate only.
Paying off high-interest debt does two things for a future homebuyer: it saves interest, and it lowers your debt-to-income ratio, which can improve both your approval odds and your mortgage rate.
This calculator shows how long it takes to clear a balance at a fixed monthly payment and how much interest you pay along the way. Small increases in the payment can dramatically shorten the timeline.
How to Use This Calculator
- 1
Enter the current balance on the debt.
- 2
Enter the interest rate, or APR, on the account.
- 3
Enter the monthly payment you can commit to.
- 4
Read the payoff timeline and total interest, then test a higher payment to see the effect.
The Formula & Assumptions
Each month:
balance += balance × (APR ÷ 12)
balance −= payment
Count months until balance ≤ 0
We add one month of interest to the balance, subtract your payment, and repeat until the debt is gone. The total interest is everything you paid above the original balance.
If your payment is smaller than the monthly interest, the balance grows instead of shrinking and the debt never clears. The calculator flags this so you can raise the payment.
For mortgage planning, retiring a balance entirely removes its monthly payment from your debt-to-income ratio, which can free up meaningful borrowing power.
Frequently Asked Questions
How does paying off debt help me get a mortgage?
Clearing a balance removes its monthly payment from your debt-to-income ratio, which is one of the biggest factors in qualifying. A lower ratio can increase how much you can borrow and improve your rate.
Should I pay off debt or save for a down payment?
It depends on the interest rates and your timeline. High-rate credit card debt usually deserves priority because it both costs more and weighs on your DTI, but keeping some cash for a down payment matters too. Balance both.
Why does the calculator say my payment is too low?
If the monthly payment is less than the interest charged that month, the balance rises rather than falls and the debt never pays off. Increase the payment above the monthly interest to make progress.
Is it better to pay off the smallest balance or the highest rate first?
Paying the highest-rate debt first saves the most money mathematically. Paying the smallest balance first, the snowball method, builds momentum. Either works — the key is consistency.
Ready to Turn Your Estimate Into a Real Pre-Approval?
Get a personalized rate quote and pre-approval from a licensed Florida mortgage broker — no obligation.
Rates are illustrative only. APR and payments vary by credit score, loan amount, and market conditions. Subject to credit approval. Not a commitment to lend. NMLS# 1859012. Equal Housing Lender.