Key points
- The interest rate describes borrowing cost before some charges are considered.
- APR is designed to help compare borrowing with compulsory costs included.
- Repayment timing can make two loans with similar rates feel very different.
Why the two numbers differ
The stated interest rate is the cost applied to the balance. APR tries to express the yearly cost of borrowing after certain fees and required charges are included. That makes APR useful for comparing products that have different fee structures. A loan with a lower interest rate can have a higher APR if the compulsory fees are large.
What APR is good for
APR is strongest when comparing loans of similar size and term. It helps stop fees being hidden behind a low headline rate. It is less perfect when you plan to repay early, borrow for a shorter period than advertised, or use a product such as a credit card where the balance can change every month.
Repayments still matter
Two borrowing options can have similar APRs but different monthly payments. The payment depends on the amount borrowed, rate, term and repayment structure. A longer term can reduce the monthly pressure but raise the total cost. A shorter term can save interest but needs more monthly cash flow.
How to compare fairly
Compare the APR, monthly payment, total repaid and any early repayment rules. If the borrowing is for a specific purchase, compare the total cost against waiting and saving. If the borrowing is to consolidate debt, check whether the new payment genuinely reduces the balance rather than extending the problem.
Related calculators
Put the guide into practice
Open the calculators that match this topic and test the numbers with your own inputs.