Apr vs interest rate: the decision in numbers
APR vs interest rate: learn which figure compares eligible borrowing costs, which one calculates monthly interest, and what each measure can leave out.
Two percentages answer different questions
The nominal interest rate calculates interest on the outstanding balance. APR (called APRC for many EU mortgages and TAEG, RRSO or effective annual rate in local markets) is a standardised annual measure for comparing the total cost of offers. It includes interest and specified compulsory costs under the applicable rules. A payment calculator still needs the contractual nominal rate.
A simple comparison
Offer A lends €10,000 for three years at 6% with no fee. Its level payment is about €304.22 and total interest about €951.92. Offer B advertises 5.5% but charges a compulsory €300 setup fee; its payment on principal alone is about €301.96, yet the fee can make its all-in cost higher. The nominal rate makes B's instalment look cheaper. APR is designed to fold eligible costs and timing into one annual figure, revealing that the headline rate is not the whole price.
The precise APR cannot be reproduced by merely adding €300/€10,000 to 5.5%. Cash-flow timing matters: the borrower may receive less on day one while repaying the full face amount over time.
Use each number for its proper job
Use APR to compare like-for-like offers with the same amount, term, repayment pattern and product type. Use the contractual nominal rate, balance, term and compounding convention to model instalments and amortisation. Read the euro total payable as well: two APRs can be close while the longer loan costs much more because interest runs for longer.
APR normally depends on assumptions prescribed by law, especially for variable rates or optional services. Costs not known to the lender, late-payment charges and genuinely optional products may be excluded. Ask for the European Standard Information Sheet for a mortgage or the pre-contractual information required for consumer credit and check which fees are included.
A four-line offer check
Write down the amount actually received, every compulsory upfront and recurring cost, the instalment count, and total amount repayable. Then compare APRs only across matching scenarios. For a variable-rate offer, test a higher rate; APR is a comparison snapshot, not a guarantee of future payments. For early repayment, inspect compensation separately because it may not be represented in the original APR.
The extra-payment calculator needs the nominal contractual rate, not APR. APR helps choose between disclosed offers; the rate drives the month-by-month loan mathematics.
Questions to ask before signing
Ask whether opening, account, valuation, intermediary, insurance and payment-method costs are compulsory, and identify each item included in the quoted APR. Confirm whether the advertised rate is fixed for the full term or only an introductory period. Request the amount of every instalment and the total payable in euros. If two quotes use different terms, ask for matched illustrations; otherwise the APR comparison can answer the wrong question. Keep the dated disclosure, because a verbal headline is difficult to audit. Where the lender permits cancellation or early repayment, read those costs separately rather than assuming the original APR describes every possible exit.