What does paying extra actually save?
Add $50 or $100 a month — or switch to biweekly — and see how many months disappear from your loan and how much interest you never pay.
Your result
How extra payments work
Extra payments work because they go straight to principal. Your required payment stays the same, but every extra dollar shrinks the balance that next month's interest is charged on — so the saving compounds month after month.
Biweekly payments are the same idea in disguise: 26 half-payments a year equals 13 full payments instead of 12. You barely feel the difference, but the loan typically ends about a year early.
One warning: on an income-driven plan (RAP or IBR), extra payments do not reduce your required monthly payment, and if your balance is headed for forgiveness, the extra money may not buy you anything. Run the RAP vs IBR calculator first if you are on IDR.
Frequently asked questions
Why does a small extra payment save so much?
Every extra dollar goes straight to principal, so the balance falls faster and less interest accrues next month. The effect compounds: the earlier you start, the more months you cut.
How do biweekly payments work?
Instead of 12 monthly payments a year you make 26 half-payments — which adds up to 13 full monthly payments. That one extra payment a year typically cuts a 10-year loan down by about a year.
Do extra payments help on an income-driven plan?
On the standard plan, yes — extra payments shorten the loan and save interest. On an income-driven plan (RAP or IBR), extra payments do not lower your required monthly payment, and if your balance will be forgiven anyway, the extra money may be wasted. Check which plan you are on first.
Should I put extra money on my student loan or my credit card?
For most borrowers, yes — but only after higher-rate debt is handled. A credit card at 25% APR costs far more than a student loan at 6.52%. Use the payoff priority calculator to check the order before you commit the extra money.
How accurate is the new payoff date?
It is an estimate. It assumes a fixed rate and that you pay the extra amount every month without fail. Real life varies — the point is the direction and the size of the saving, not the exact month.
Where to go next
Credit Card Payoff Tools
Compare the snowball and avalanche methods and build a month-by-month plan for paying cards off.
Visit →RAP vs IBR Calculator
Your required payment depends on your plan. Compare RAP, IBR, and the standard plan before you send extra money.
Visit →Free tools from the same family. These links open in a new tab; we earn nothing from them.