APR, nominal rate and how to compare loans without getting it wrong

When a bank advertises a loan there are two percentages on the poster, and only one of them is any use for comparison. The nominal rate is usually the one in large type; the APR sits in smaller print. That typographic hierarchy is no accident, because the APR is almost always the higher figure — and also the only honest one.

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.

Its great limitation is that two loans with the same nominal rate can cost different amounts. If one compounds monthly and the other annually, the first generates interest on interest twelve times a year and ends up more expensive, even though the advertised number is identical. The nominal rate alone cannot reveal that difference.

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.

That legal obligation is exactly what makes it useful: because the calculation method is standardised, one bank's APR and another's are directly comparable. It is the financial equivalent of a nutrition label, and for the same reason it deserves to be the first figure you look at.

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. Note: this formula only reflects the effect of compounding; it does not add fees. A loan's contractual APR is calculated by additionally incorporating those mandatory fees and charges, so it is usually higher than the one obtained by converting the nominal rate alone.

On deposits: the APR that really counts

With savings products the logic inverts: here the APR is your real return, and the higher the better. A deposit paying a 3% nominal rate with monthly settlement yields more than another at 3% with annual settlement, because the interest credited each month starts earning interest itself. Their respective APRs are 3.04% and 3.00%.

The usual catch with deposits and interest-bearing accounts is different: the advertised APR often applies to a welcome promotion covering the first three or six months, not the full term. Always check which period the headline figure refers to, and what APR applies afterwards.

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.

Nor does the APR cover the tied home or life insurance that many mortgages require, or contingent fees paid only if something happens, such as early repayment. That is why two mortgages with an identical APR can cost noticeably different amounts: an honest comparison means adding the annual cost of any tied products separately.

How to compare personal loans

Comparing personal loans is harder than it looks, not because the maths is complicated but because offers are designed so that you compare whatever suits the lender. The monthly payment is advertised in large type; the total cost, nowhere. This guide walks through the four figures that actually determine what you will pay, and the order in which to look at them.

First mistake: focusing on the monthly payment

A loan with a low monthly payment is not necessarily cheaper: it may simply have a longer term and you end up paying much more in total interest. Always compare the total cost of the loan (payment × number of payments) and the APR, not just the monthly payment.

The effect is easy to underestimate. On €15,000 at an 8% nominal rate, over five years the payment is around €304 and you repay about €18,250. Stretching the same loan to ten years drops the payment to roughly €182 — it looks far better — but you end up repaying close to €21,850. You have paid €3,600 more for the same money in exchange for a more comfortable payment. Sometimes that comfort is genuinely needed; what must not happen is that you choose it without knowing its price.

What the APR includes in personal loans

Unlike deposits (where it only includes interest), the APR on a personal loan includes: the nominal interest rate, the opening fee and any other mandatory charges. It does not include life or payment protection insurance if optional — but if they are compulsory to obtain the loan, they must be included.

This is where the sector's most common trick lives: the «optional» insurance that in practice is not. If taking it out drops the rate by two points, that insurance is not optional in any economic sense, yet by being declared optional it stays outside the advertised APR. The way to spot it is to ask for two written offers, with and without the tied product, and compare the total cost of each.

The four figures to always ask for

• •APR, not just the nominal rate: it is the one indicator the law requires precisely so that offers can be compared
• •Total amount payable: the sum of everything you will repay, in euros
• •Opening, arrangement and early-repayment fees
• •Whether there are compulsory tied products and what they cost per year

The amortisation schedule

The amortisation schedule breaks down each payment: how much goes to interest and how much reduces the capital. In the first few months, almost everything is interest. If you make an early repayment in the first months of a personal loan (without a fee), the interest saving is at its maximum.

That breakdown explains something that catches many people out: after two years of paying diligently, the debt has barely fallen. It is not a bank error, it is how the French amortisation system works — the payment stays constant but its composition shifts. At the start you are mostly paying rent on the money; only towards the end are you repaying the money itself.

The early-repayment fee

For consumer loans Spanish law caps this fee: at most 1% of the capital repaid early if more than a year of the contract remains, and 0.5% if less. It can also only be charged where the lender actually loses money on the cancellation. The cap is low, so early repayment usually pays off, but check exactly what your contract says before running the numbers.

When does a personal loan make sense?

Personal loans make sense for specific expenses with a clear purpose: home renovations, vehicle purchase, funding studies or consolidating higher-rate debts. They do not make sense for recurring expenses or to fund consumption that generates no value.

Debt consolidation deserves a separate warning. Bundling several expensive debts into one cheaper loan is sensible on paper, but it only works if you stop using the credit lines you have just cleared. If the cards fill up again, you will have doubled the debt rather than reduced it — a considerably worse position than where you started.