Loan Payoff Calculator
Wondering when your loan will be paid off? Enter your current balance, interest rate, and monthly payment to see your payoff timeline and total interest. Add extra payments to see how much you can save.
How Loan Payoff Calculations Work
Each month, your lender calculates interest on the current balance using the annual rate divided by 12. If you owe $20,000 at 6% APR, monthly interest is $20,000 × 0.06 / 12 = $100. The rest of your payment reduces principal. Next month, interest is calculated on the lower balance, so more of your payment tackles principal.
This amortization process accelerates over time. Early payments are mostly interest. By the final months, payments are mostly principal. The exact split depends on the interest rate and term, but the pattern is universal.
Extra payments disrupt this schedule by reducing principal faster. Every extra dollar cuts principal immediately, which lowers the next month's interest charge. Over time, those savings compound, slashing months or years from the term and thousands from total interest paid.
Strategies for Paying Off Loans Faster
The simplest approach is adding a fixed amount to every payment. Even $50 extra per month can save thousands in interest on a car loan or mortgage. Set up automatic payments that include the extra, so you don't have to remember each month.
Another tactic is making one extra full payment per year. If your monthly payment is $800, send an extra $800 once annually (tax refund, bonus, etc.). This effectively adds a 13th payment each year, cutting years off a 30-year mortgage.
Lump sum windfalls work too. Apply raises, bonuses, inheritance, or side income directly to principal. Always specify that the payment should go to principal, not future interest, or the lender might apply it differently. Check your loan servicer's policies on principal-only payments.
When Extra Payments Make the Most Sense
Prioritize high-interest debt. Credit cards at 18-25% APR should be attacked aggressively because the interest savings are enormous. A $5,000 balance at 20% costs $1,000 per year in interest, so every extra payment saves 20 cents on the dollar.
Low-interest debt (sub-4% mortgages, federal student loans at 3-4%) may be better kept while you invest spare cash. If you can earn 7-10% in the stock market, investing beats paying off a 3% loan. The gap widens over time due to compound growth.
Consider liquidity and emergencies. Paying off debt frees up cash flow, but money sent to the lender is locked in—you can't get it back without refinancing or selling assets. Keep an emergency fund before aggressively paying down low-rate debt.
Frequently Asked Questions
How do extra payments reduce my loan payoff time?
Extra payments go entirely toward principal, reducing the balance faster. Lower principal means less interest accrues each month, allowing more of your regular payment to tackle principal. This creates a snowball effect that accelerates payoff significantly.
Should I make extra payments monthly or annually?
Monthly extra payments save more interest because they reduce principal sooner. An extra $100 per month for 12 months beats a $1,200 lump sum at year-end because you avoid interest on that principal all year. Make extra payments as soon as you have the cash.
Can I pay off any loan early without penalty?
Most loans allow early payoff without penalty, but some charge prepayment penalties, especially mortgages and auto loans. Check your loan agreement for prepayment clauses. Federal student loans never have prepayment penalties. Always confirm before sending extra payments.
What if my payment is too small to cover interest?
If your payment doesn't cover the monthly interest charge, the unpaid interest gets added to the principal (negative amortization), and your balance grows. This calculator flags this scenario. You must increase your payment or restructure the loan.
Should I pay off loans early or invest the money?
Compare the loan's interest rate to your expected investment return. If the loan costs 7% and you can earn 10% investing, invest. If the loan costs 18% (credit cards) and investments average 8%, pay the debt. Also consider risk tolerance and mental peace from being debt-free.