APR vs Nominal Rate: What They Are and Why APR Is What Matters
thecalculator.tech
2 June 2026 · 5 min read
Understand the difference between the nominal interest rate and the annual percentage rate, and learn to use it to genuinely compare loans, mortgages and deposits.
What is the nominal rate?
The nominal interest rate is the percentage interest the bank applies to the loan capital, expressed annually but without taking into account the compounding frequency or product fees. It is the figure most commonly seen in advertising.
What is the APR?
The Annual Percentage Rate (APR) is the true annual cost of a loan or the true annual return of a deposit. It includes the effect of compound capitalisation and fees. It is the only indicator that allows financial products to be compared on equal terms, and its publication is mandatory in Spain.
The conversion formula
APR = (1 + r/m)^m − 1, where m is the number of compounding periods per year. If a loan has a 6% nominal rate with monthly compounding (m=12): APR = (1 + 0.06/12)^12 − 1 = 6.168%. The difference seems small, but over 20 years of a mortgage it can amount to thousands of euros.
When APR doesn't tell the whole story
The legal APR for loans includes opening fees and other recurring charges, but may not include valuation, notary or registration fees for mortgages. For a complete view of mortgage costs, the ESIS (European Standardised Information Sheet) must be provided free of charge by the bank before signing.
Always compare APR — not the nominal rate — when evaluating different loan or investment offers.
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