What if banking and card payment networks went down in late November or December?

If card and mobile payment networks went down for days, anyone relying solely on digital balance could not buy anything, even with thousands of euros in their account. Cash kept at home would work as immediate insurance.

Dependence on electronic payment has an uncomfortable downside. A prolonged failure of banking networks makes no distinction between rich and poor: it leaves anyone whose money exists only as an entry in an account unable to buy. Cash, on the other hand, keeps its value even when the system is down.

## What you can and cannot pay for without a network

Without a card or phone, a shop can only take cash or extend credit. Supermarkets, pharmacies and petrol stations would be limited to what they have in the till, and many everyday purchases would become impossible for anyone not carrying banknotes. **Ley 46/2020** (a Spanish law) requires businesses in Spain to accept cash as a means of payment, but it does not guarantee that a shop has enough change if everyone arrives at once.

The problem is not just the shop's till. ATMs also depend on the network to authorise transactions, so withdrawing money during the outage would not be guaranteed either. The cash that counts is what you already have in your pocket or at home.

## Money in the account you cannot use

Someone with **thousands of euros** in a current account and no cash reserve would find themselves, during the outage, unable to pay for bread. It is not that they lose the money: it is that they cannot move it. The wealth is still there, but inaccessible for as long as the failure lasts.

That asymmetry explains why it makes sense to keep part of your money in cash. You do not need a large sum. Enough to cover a few days of basic expenses avoids depending on the network working at the worst possible moment.

## Easier to cope with than a power cut

A power cut affects electronic payment, lighting, food storage and transport all at once. A failure of banking networks, by contrast, leaves the lights on and shops open: it only blocks payment. That is why the scenario is less serious than a general blackout, though more inconvenient than it seems.

The comparison helps to gauge the risk. It is not a catastrophe, but it is not solved with patience either if the outage lasts several days and there is no cash at hand.

## How much cash makes sense to keep

There is no universal figure. A reserve equivalent to several days of usual expenses covers most brief interruptions. Keeping more means taking on the risk of having it at home, with the possibility of loss or theft that entails.

The decision is personal and depends on each situation. What you should avoid is total dependence on a system that, when it fails, gives no warning.

This text is for information purposes only and does not constitute financial advice; for decisions about your money, consult a professional.