Tacit Overdraft Spain 2026: The Real Cost

Going 50 euros into the red for twelve days can leave you about 15 euros poorer before any separate, fact-specific debt-claim fee. Banks call this a "descubierto tácito": if your account contract allows it, the bank may charge an overdraft commission and daily debtor interest, both subject to the consumer TAE cap.

Some current accounts in Spain may let certain payments go through when your balance cannot cover them. That convenience can be expensive when the account contract allows a tacit overdraft. If your account dips below zero without a pre-arranged overdraft line, the bank may apply the cost concepts set out in the contract: an overdraft commission, debtor interest, or both.

Spanish consumer law caps the annual equivalent cost of consumer tacit overdrafts at 2.5 times the official legal interest of money. Banks know the ceiling exists, and their own documents often state that the overdraft commission plus debtor interest must stay within it. The risk for consumers is that minimum commissions can still make small, short overdrafts feel punitive unless you check the calculation.

What a tacit overdraft actually means

Two kinds of overdraft exist in the Spanish banking system. The "descubierto expreso" is a contracted overdraft line with a published interest rate, agreed in writing when you open the account. The "descubierto tácito" is the silent version: the bank pays a charge your balance cannot cover, your account goes negative, and you owe them money you never asked to borrow.

The tacit overdraft is defined in Article 4.2 of Ley 16/2011 and governed, for this point, by Article 20; an agreed overdraft facility is treated separately under Article 4.1 and the specific overdraft-information rules. A tacit overdraft may be charged through a commission, debtor interest, or both, where disclosed and within the consumer cap.

The trigger is usually ordinary: a direct debit arrives before your salary, a forgotten subscription renews, or a card payment is authorised when the balance is low. If the bank admits the charge without sufficient funds, the account can enter a tacit overdraft and the costs set out in the account contract may apply.

The costs that can hit you, side by side

A descubierto tácito is not always a single line item. Depending on the account, you may see an overdraft commission, debtor interest, and sometimes a separate debt-claim fee if the debt is not regularised.

The first possible cost is the comisión por descubierto: a proportional commission, usually with a minimum, calculated on the highest debit balance in the liquidation period. In the products checked, BBVA, Sabadell and Bankinter publish 4.50% with a 15 euro minimum; Santander publishes 5% with a 15 euro minimum; CaixaBank describes 0.20%; and ING publishes 0 euros for tacit-overdraft opening. On a 50 euro overdraft at a 15 euro minimum, the minimum does the damage; on a 500 euro overdraft at 4.50%, the commission would be 22.50 euros.

The second possible cost is the interés deudor: debtor interest charged on the overdrawn balance until you cover it. In the products checked, consumer tacit-overdraft rates sit closer to 7 to 8% TIN/TAE than 10%, but the exact number depends on the bank and account. What matters legally is the TAE, because the cap is applied to the annual equivalent cost including the relevant overdraft charges.

What it actually costs you in euros

These are illustrative numbers using a common published structure, 4.50% commission with a 15 euro minimum plus about 7.50% debtor interest, applied to four scenarios. They are not the tariff of every bank:

The minimum is what makes small overdrafts brutal. In the model above, slipping 50 euros into the red for a week costs about 30% of the shortfall. Slipping 300 euros into the red for three weeks costs about 5.4%. The smaller the overdraft, the harder the minimum bites.

The 2.5x cap nobody mentions

Article 20 of Ley 16/2011 sets a hard ceiling on consumer tacit overdrafts: the TAE cannot exceed 2.5 times the legal interest of money. For 2026, Banco de España lists the legal interest at 3.25%, so the reference cap is 8.125% TAE unless a later budget law changes it.

That is the TAE, not the TIN. Banco de España says the overdraft-opening commission must be considered when checking the Article 20.4 cap. Do not treat a statement line as automatic proof of illegality: check the bank's liquidation document, the interest, the commission, the period, and whether any separate claim fee was charged.

Banco de España guidance reinforces the cap and clarifies when the overdraft commission can be charged. Supreme Court case law treats these commissions as fact-dependent: they may be valid, but they must respect the cap and other conditions. That makes the statement line worth checking, not automatically unlawful.

How to claim back the fees you already paid

The mechanical version of the claim:

1. Pull the statements and transaction records you need for the period you are claiming. Spanish payment-services rules require banks to keep and provide relevant payment records on request for at least six years; legally required information is free, but extra copies, extra frequency or non-contract channels may carry reasonable cost.
2. Identify every "comisión por descubierto" or equivalent line on those statements. Note the amount and the date.
3. Send a written claim to the bank's Servicio de Atención al Cliente citing Article 20.4 of Ley 16/2011, the Banco de España criteria on tacit-overdraft liquidation, and STS 431/2020 where relevant. If the matter is treated as a payment-services complaint, you can usually escalate after 15 business days without a response; for other consumer banking complaints the threshold is one month, and two months applies to non-consumer complaints.
4. If they refuse or stall, escalate to the Banco de España's Servicio de Reclamaciones. Free, no lawyer required.

How to never pay one again

The cleanest way to reduce this category of fee is to use an account or setting that does not admit certain charges in overdraft, where the bank offers that option. Some products also publish lower or zero tacit-overdraft opening commissions. We covered broader low-fee account options in our comparison of fee-free accounts in Spain.

If switching banks is not on the table this month, the next best move is knowing exactly what your current bank has been charging you. You can run a free fee analysis on your existing account and see every descubierto tácito charge from the last 90 days, line by line.

A small overdraft is still credit, and the fixed minimum is what can make it expensive fast.

Sources:
- Ley 16/2011 de Contratos de Crédito al Consumo (BOE)
- Banco de España — Descubierto tácito: liquidación, intereses y comisión por descubierto
- Banco de España — Tabla de tipos de interés legal
- Real Decreto-ley 19/2018 de servicios de pago (BOE)
- Santander, BBVA, CaixaBank, Sabadell, Bankinter and ING España — published fee/pre-contractual documents checked on the research date
- Tribunal Supremo — STS 431/2020, 15 July 2020, on overdraft/position-claim commissions