If you’re comparing a savings account, deposit, personal loan or mortgage in Spain, you’ll often see two interest-rate acronyms: TIN and TAE. So what are they, and which one is a better interest rate to compare with other financial products?

TIN (Tipo de Interés Nominal) is the nominal interest rate applied to a financial product. TAE (Tasa Anual Equivalente) is a broader annualized measure that takes the TIN, payment frequency and certain fees and costs into account.

In simple terms, TIN shows the basic interest rate, while TAE gives you a better basis for comparing the actual cost or return of similar financial products.

TIN vs. TAE at a glance

The Bank of Spain says TAE incorporates the nominal interest rate as well as the frequency of payments and certain commissions and expenses.

What is TIN?

TIN stands for Tipo de Interés Nominal, or nominal interest rate. It is the basic rate a bank pays you on savings or charges you when you borrow money.

For example, if a savings account offers a 3% TIN, the nominal rate is 3% per year. On €10,000, that works out to €300 in nominal interest over a year before considering the effect of how that interest is paid or any applicable costs.

For a loan, a 5% TIN means the nominal interest rate charged by the lender is 5%. The important point is that TIN alone doesn't tell you the full return on savings or the full cost of borrowing.

What is TAE?

TAE stands for Tasa Anual Equivalente, or equivalent annual rate.

Unlike TIN, TAE takes the timing of payments into account and can incorporate certain commissions and expenses. That makes it more useful when comparing similar financial products.

For savings products, the TAE is based on compound interest and assumes that interest earned is reinvested at the same rate.

How does TIN become TAE? An example

Suppose a high-yield savings account advertises:

3% TIN, with interest paid monthly.

If you simply multiply €10,000 by 3%, you get €300 in interest.

But monthly interest payments change the calculation because each month's interest can itself begin earning interest.

At 3% TIN paid monthly:

• Monthly rate = 3% ÷ 12 = 0.25%

• After the first month, €10,000 becomes €10,025

• After the second month, interest is calculated on €10,025 rather than the original €10,000

• This continues for all 12 months

  
  

If the interest is left in the account, €10,000 grows to about €10,304.16 after one year. That works out to an effective annual rate of about 3.04%, rather than exactly 3%.

That's the key connection between TIN and TAE: the TIN provides the underlying rate, while TAE annualizes the effect of payment frequency and other applicable costs.

If the same 3% TIN were paid only once at the end of the year, with no fees, the TAE would be much closer to 3%. The Bank of Spain specifically notes that payment frequency can cause the TAE to differ from the TIN.

Why TAE matters when comparing savings accounts

A high TIN can look attractive, but it doesn't tell the whole story.

When comparing savings accounts or deposits in Spain, look at the TAE alongside:

• The maximum balance that earns interest

• How long the advertised rate lasts

• Whether the rate is promotional

• Salary, direct-debit or card-use requirements

• Any account fees

• What happens after the promotional period

For example, an account advertising a high introductory TIN may not be the best deal if the rate only applies for a few months or to a small portion of your balance.

For current offers, see our guide to the best savings accounts in Spain.

Is TAE always higher than TIN?

No.

TAE is often higher when interest is paid or compounded more frequently or when applicable fees are included, but there is no rule that TAE must always be higher.

If there are no fees and interest is paid once a year, for example, TAE can be very close to TIN.

What should you compare: TIN or TAE?

As a general rule:

• For savings accounts and deposits: Compare TAE, but also check the balance limits, promotional period and conditions.

• For personal loans: Compare TAE and the total repayment amount.

• For mortgages: TAE is an important comparison figure, but also examine the TIN, fees, insurance, linked products and other conditions. The Bank of Spain provides a separate mortgage TAE calculator for this purpose.

In other words, TIN tells you about the interest rate; TAE helps you compare the product as a whole.

TIN vs. TAE vs. APR

If you compare financial products internationally, you may also encounter APR (Annual Percentage Rate). APR and TAE serve broadly similar purposes, but the terms and calculation rules can differ between countries. In Spain and the EU, TAE is the relevant standardized measure for comparing many financial products.

If you're comparing a Spanish offer with one from another country, check exactly what each rate includes rather than assuming the percentages are calculated identically.

Frequently Asked Questions

What is the difference between TIN and TAE?

TIN is the nominal interest rate. TAE is a broader annualized measure that takes the TIN, payment frequency and certain costs into account. This generally makes TAE more useful for comparing similar financial products.

Which is better, TIN or TAE?

Neither is inherently better because they measure different things. TAE is generally the more useful figure for comparing financial products, while TIN tells you the underlying nominal interest rate.

Why is TAE higher than TIN?

TAE can be higher because it accounts for factors such as the frequency of interest payments and certain fees or expenses. However, TAE is not always higher than TIN.

Is TAE the same as APR?

Not necessarily. They serve similar purposes but can follow different calculation rules depending on the country. In Spain, TAE is the relevant measure for many consumer financial products.

TIN vs. TAE

TIN is the basic nominal interest rate. TAE gives you a broader annualized measure of the cost or return.

When comparing financial products in Spain, TAE is usually the better starting point — but don't stop there. Check the rate period, balance limits, fees and conditions to understand what you'll actually earn or pay.

For an official explanation and calculators, see the Bank of Spain's guidance on interest rates and TAE.