Should I make extra loan payments or invest?

Compare the loan interest rate to your expected investment return. If your loan is at 7% and you expect 10% from investments (after tax), investing might win mathematically. But paying off debt is a guaranteed return with zero risk. Many people prefer the psychological benefit of being debt-free.

Do extra payments always go to principal?

Generally yes, but confirm with your lender. Some lenders apply extra payments to the next month's payment instead of principal. You may need to specify 'apply to principal' when making extra payments. Check your loan servicer's process.

Is a lump sum or monthly extra payments better?

A lump sum payment earlier saves more interest because it reduces the principal immediately. But consistent monthly extra payments are easier to budget. The best approach is whatever you'll actually stick with. Even $50/mo extra makes a meaningful difference over time.

Are there penalties for paying off a loan early?

Most personal loans, auto loans, and federal student loans have no prepayment penalty. Some mortgages (especially subprime) and business loans may have early payoff fees. Always check your loan agreement or ask your lender before making large extra payments.

Loan Payoff Calculator

See how extra payments can accelerate your loan payoff. Compare timelines and interest savings side by side.

Last updated: 2026-03-07

Loan payoff calculator

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No calculations yet. Complete a calculation to see it here.

Examples

Auto Loan
$25,000 at 6.5% with $200/mo extra
A 5-year auto loan where you add $200 extra per month to the $500 payment.
Pay off 19 months early, save ~$1,500 in interest
Student Loan
$40,000 at 5% with $150/mo extra
Federal student loans with a standard 10-year repayment, adding $150 extra per month.
Pay off ~30 months early, save ~$2,800 in interest
Personal Loan
$15,000 at 9% with $100/mo extra
A personal loan with a relatively high rate, adding a modest extra payment.
Pay off ~11 months early, save ~$700 in interest

How extra payments accelerate loan payoff

Every extra dollar you pay goes directly toward your principal balance, not interest. This reduces the balance that accrues interest next month, creating a snowball effect that accelerates your payoff.

For example, on a $25,000 loan at 6.5%, your regular $500/mo payment takes about 59 months and costs $4,325 in interest. Adding just $200/mo extra cuts it to 40 months and saves over $1,500 in interest.

The earlier you start making extra payments, the more you save, because each dollar of principal reduction prevents interest charges for all remaining months.

Before making extra payments, check if your loan has prepayment penalties. Most personal and auto loans don't, but some mortgages and business loans may charge a fee for early payoff.

Frequently asked questions

Should I make extra loan payments or invest?: Compare the loan interest rate to your expected investment return. If your loan is at 7% and you expect 10% from investments (after tax), investing might win mathematically. But paying off debt is a guaranteed return with zero risk. Many people prefer the psychological benefit of being debt-free.
Do extra payments always go to principal?: Generally yes, but confirm with your lender. Some lenders apply extra payments to the next month's payment instead of principal. You may need to specify 'apply to principal' when making extra payments. Check your loan servicer's process.
Is a lump sum or monthly extra payments better?: A lump sum payment earlier saves more interest because it reduces the principal immediately. But consistent monthly extra payments are easier to budget. The best approach is whatever you'll actually stick with. Even $50/mo extra makes a meaningful difference over time.
Are there penalties for paying off a loan early?: Most personal loans, auto loans, and federal student loans have no prepayment penalty. Some mortgages (especially subprime) and business loans may have early payoff fees. Always check your loan agreement or ask your lender before making large extra payments.

Break free from debt faster

Even small extra payments make a big difference. Bookmark this calculator and revisit whenever you can increase your payments.

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Disclaimer

This calculator provides estimates based on constant interest rates and payment amounts. Actual payoff timelines may vary due to payment processing, rounding, variable rates, or fees. Check with your lender for exact figures. This is not financial advice.

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