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Loan guide

Understanding the cost of a loan

How APR, interest, fees and repayment length combine to determine what a loan actually costs you.

6 min readLast reviewed: Aug 2026

The true cost of a loan isn't captured by any single number — it's the combination of the rate, any fees, and how long you'll be repaying. Here's how each piece fits together.

APR

The annual percentage rate combines the interest rate with certain required fees into one annualized figure, meant to make offers comparable. See our full guide to APR for more detail.

Interest

Interest is the ongoing cost of borrowing the principal, typically calculated as a percentage of the outstanding balance. The longer you carry a balance, the more interest accrues — which is why paying down principal faster, when you can afford to, reduces total cost.

Fees

Common fees include origination fees (charged to set up the loan, sometimes deducted from the amount you receive), late fees, and occasionally prepayment penalties. Always ask for a complete list of potential fees before accepting an offer.

Repayment period

A longer repayment term generally lowers your monthly payment, but extends the time interest has to accrue — which can raise the total amount you repay overall. A shorter term does the opposite: higher monthly payments, but typically less total interest.

FactorWhat it affects
APRThe all-in annualized cost, for comparing offers
Interest rateOngoing cost on the outstanding balance
FeesOne-time or conditional charges beyond interest
Term lengthTrade-off between monthly payment and total cost

Our loan payment calculator can help you see how changing the amount, APR or term shifts your estimated monthly payment and total repayment.

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