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The headline interest rate is the number lenders advertise; the APR is the number you should compare. This guide explains each component of a personal loan’s cost and shows, with simple examples, how rate, term and fees combine.
Interest rate vs APR
The interest rate is the yearly cost of borrowing the principal. The APR adds most mandatory fees — above all the origination fee — and expresses the total as an annual percentage. Two loans with the same interest rate can have very different APRs once fees are included, which is why regulators require lenders to disclose APR.
Origination fees
Many online lenders charge 1–10% of the loan amount, deducted before the money reaches your account. Borrow $10,000 with a 5% fee and you receive $9,500 but repay interest on $10,000. If you need the full amount, you must borrow more. Banks and credit unions more often charge no origination fee.
Late, returned-payment and prepayment fees
| Fee | Typical range | How to avoid it |
|---|---|---|
| Late payment | $15–$40 or a percentage | Set up autopay; many lenders also give a small rate discount for it |
| Returned payment | $15–$35 | Keep a buffer in the linked account |
| Prepayment penalty | Rare; up to a few months’ interest | Choose a lender that states ‘no prepayment penalty’ |
| Payment by card or phone | $5–$15 | Pay by bank transfer |
How term length changes total cost
| $8,000 at 12% APR | Monthly payment | Total interest |
|---|---|---|
| 2 years | $377 | $1,038 |
| 4 years | $211 | $2,112 |
| 6 years | $156 | $3,261 |
Rounded illustrative figures. A longer term lowers the payment but roughly triples the interest here.
Calculating total cost yourself
- Total repaid = monthly payment × number of months
- Add any fees deducted up front or charged separately
- Subtract the amount you actually received
- The difference is the true cost of the loan
Use this on every offer you compare; our offer comparison guide shows a worked side-by-side. Your rate itself depends largely on the factors in our eligibility guide.
Frequently asked questions
Part of our complete guide to personal loan options.
Independent educational content. Not affiliated with any lender. Not financial advice; terms vary by lender, location and applicant.

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