Loan Payoff Calculator

How extra payments change a loan payoff plan

A loan payoff plan depends on three main variables: the balance, the interest rate, and the payment amount. Each month, interest is calculated on the remaining balance. Whatever is left from the payment after interest goes toward principal. When you add extra money to the payment, more principal is removed sooner, and the next month has a smaller balance for interest to accrue on.

This is why even a modest extra payment can create a visible difference over time. The original schedule shows what happens if you keep paying the regular monthly amount. The extra-payment schedule shows the new payoff path after adding the extra monthly amount. The chart compares both balances month by month so the gap is easy to see, and the result boxes summarize the payoff dates and interest saved.

Before using an extra-payment strategy, confirm that your lender applies extra money to principal and check whether there are prepayment penalties. Many personal loans, auto loans, and student loans allow principal prepayment, but loan rules can vary. If your budget is tight, compare the extra payment against emergency savings, high-interest debt, and other required bills before committing to a larger monthly payment.

One practical way to use this calculator is to test a small extra amount first, such as $25, $50, or $100 per month. If the payoff date moves meaningfully and the interest savings are worth the cash flow tradeoff, the extra payment may be a strong debt-reduction habit. You can also compare a larger one-time budget change by moving the monthly payment slider and watching the table update. The principal, interest, and extra-payment columns show exactly where the money goes each month.

For loans with higher interest rates, extra payments usually create faster savings because each dollar of principal reduction prevents more future interest. For lower-rate loans, the benefit may still be useful, but it should be weighed against other goals. The best payoff strategy is usually the one that is realistic, consistent, and matched to the loan rules you actually have.