Max cash in bank without investing: from two salaries to €100,000

The bank account cushion: from three salaries to the untouchable €100,000

With interest rates at zero, leaving money idle yields exactly 0%. And that 0% can beat more than one alternative offering negative returns. That is why the recurring question is not whether it is worth holding liquidity, but how much: available money is not idle money; it is the difference between enduring a dismissal or selling your portfolio at the worst point of the cycle. The range Spanish savers consider goes from two salaries to one hundred thousand euros, and no one agrees.

The rule of two to three salaries and where it comes from

There is a criterion repeated insistently: the first level of any portfolio, immediate liquidity —checking accounts, cash, instantly available money— should equal between two and three times net monthly income. Three is better than two. It yields 0%, and that is precisely the price of availability. Above that threshold appears a second tier designed for predictable but not immediate expenses: changing cars, home repairs, a quarter without a paycheck. Only then does long-term investment come in.

The logic behind this gradation is that each level assumes a different horizon, and mixing them forces you to liquidate assets when inappropriate. Another formulation, closer to the labor market, calculates the cushion by re-employment time: how many months it would take to return to billing if your salary disappeared tomorrow, and a multiplier of two is applied to that figure. With this method, the floor rises well above the manual's three salaries.

How much should someone with a €1,800 salary and €150,000 available have sitting idle?

The first level is cleared in two minutes: between €3,600 and €5,400 in immediate availability. There is no serious debate there. The problem is the rest, because the second tier has no closed formula, and each profile resolves it their own way.

The circulating answers are surprisingly disparate. Some set the total cushion —current account plus available savings— at nine months of expenses. Others prefer starting from three months' salary and updating it whenever the paycheck changes, with part in cash at home. And some simply refuse to risk: €160,000 entirely in an unremunerated account or fixed deposit, accepting losing against inflation just to avoid seeing a red number. Another common case: €12,000 on demand and the rest distributed among real estate, land, stocks, and rents.

Age changes the equation more than any rule. A twenty-something can afford almost everything in equities because they have decades to recover from a crash; at seventy, the drop is suffered without time to wait. And a pension of €1,800 is comfortable with owned housing and very tight if paying €1,300 in rent.

The €100,000 per-account ceiling and the ghost of bail-in

Here there is broad agreement: never more than €100,000 in the same account. The reason is not comfort, but European Directive 2014/59/EU, in force in Spain since January 2016, which opens the door to haircuts on deposits above that amount within a bank resolution process. The most cited Spanish example is the resolution of Banco Popular, whose shares ended up worthless.

To this adds the obligation to inform the Agencia Tributaria (Spanish Tax Agency) when money is in accounts outside Spain: the threshold starts at €50,000. Nothing is paid for reporting, but the obligation exists and continues to be enforced.

Remunerated accounts, deposits, and money markets: where to park the cushion

Immediate liquidity and a token yield are no longer incompatible. There are remunerated accounts reaching 1% that allow access to funds overnight, and platforms channeling Norwegian bank deposits with added tax conditions. Below that, standard remunerated deposits do not exceed 0.5%, and fixed terms reach 1.50%. The catch with early-cancellation deposits is that rescuing them loses accrued interest.

Money market funds work as parking spots for another reason. In euros and with negative rates, they practically guarantee losing money every year; their appeal is fiscal and domicile-based, not profitability. The full calculation, with the exact annual loss percentage, appears in the original material.

Permanent portfolio, age, and profile: cash is also diversified

Against the three-salary rule, there are approaches raising the bar: keeping at least 50% in liquidity and treating index funds as an incomprehensible artifact. Opposing this, the classic permanent portfolio splits equally: 25% cash, 25% stocks, 25% metals, 25% bonds. And some argue that this split is the only structure that withstands any scenario without shocks.

The most methodical profiles combine layers. A textbook scheme: three months' salary in free accounts with immediate availability, one-third of one-third of income in remunerated accounts for non-immediate expenses, and the bulk in index funds with an 80/20 split, with a minority position —around 10%— in a value fund with a 60/40 split. The unwritten rule: do not leave more than 20% in the hands of a single manager.

What idle money loses over 15 years

The definitive argument against excess liquidity is not ideological, it is arithmetic. With €100,000, 1% inflation, and net dividends of 3%, the current account does not stay still: it empties itself in real terms. The year-by-year breakdown —how much the account is worth, how much the portfolio is worth, and what difference accumulates— gives a result that surprises even those who expected it.

How much cash is too much cash? With rates where they are, the honest answer is that no one knows. Meanwhile, the question remains the same.