Loan Payoff Calculator

How extra payments accelerate your loan payoff

Every dollar you pay beyond the required minimum goes directly to principal. That matters because interest is calculated on your remaining balance each month. Lower balance means less interest, which means more of your next payment goes to principal too. The effect compounds over time, and even modest extra payments can shave months or years off your loan.

The math of extra payments

On a $20,000 car loan at 6.99% APR with a $400 monthly payment, you would pay about $3,880 in total interest over 60 months. Add just $50/month in extra payments and that drops to roughly $3,220. That is $660 saved and you are done 7 months earlier. Push it to $100/month extra, and the savings climb past $1,100 with the loan paid off a full year ahead of schedule.

The savings are not linear. Because interest compounds monthly, early extra payments have a disproportionate impact on the total cost of your loan. The sooner you start, the more you save.

Where to find extra money for payments

You do not need a windfall. Small, consistent extras add up faster than most people expect.

• Round up your payment. If your minimum is $347, pay $400. That extra $53/month is invisible to most budgets but adds up to $636/year toward principal.
• Switch to biweekly payments. Pay half your monthly amount every two weeks instead of the full amount once a month. You end up making 26 half-payments (13 full payments) per year instead of 12.
• Direct windfalls to the balance. Tax refunds, bonuses, birthday money. A single $1,500 tax refund applied to a 6% loan saves more than $1,500 in the long run because of the interest you avoid.
• Automate a small extra. Set up a $25 automatic transfer on the 15th. It costs you $300/year but compounds into hundreds more in interest savings over the life of the loan.

The biweekly payment trick

Instead of paying $400 once a month, pay $200 every two weeks. Most people assume this is the same thing. It is not. There are 52 weeks in a year, so 26 biweekly payments equals 13 monthly payments instead of 12. That one extra payment per year goes entirely to principal.

On a $20,000 loan at 7%, the biweekly trick alone can shorten your payoff by 5-6 months and save $400-500 in interest. It works because you are not waiting a full 30 days between payments, so the principal balance is slightly lower when interest is calculated each period.

Should you pay off your loan early or invest?

This is one of the most common personal finance questions, and the honest answer is: it depends on the numbers and your risk tolerance.

The math is straightforward. If your loan charges 7% and you can reasonably expect 8-10% from market investments, investing appears to come out ahead. But market returns are unpredictable. Your loan interest rate is fixed. Paying off a 7% loan effectively earns you 7% on that money, risk-free. No market investment can match that level of certainty.

There is also a psychological factor. Debt creates stress. Researchers have found that the mental burden of carrying debt reduces cognitive bandwidth and affects decision-making. Eliminating a loan removes that weight, even if the pure math might favor investing. If debt keeps you up at night, paying it off faster may be the more valuable choice for your overall well-being.

For high-rate debt (above 7-8%), paying it off aggressively is almost always the better move. For very low-rate debt (under 4%), investing may make sense. For everything in between, the answer depends on your personal situation, risk tolerance, and how much that debt weighs on you.