How much emergency fund do I need in Germany?

The emergency fund's job is simple, even if the size question is personal: cover your essential expenses for a while without forcing you to sell investments at a bad moment, take on expensive credit, or make rushed financial decisions during a stressful life event.

Roughly speaking, three months of essential expenses works for stable single-employee households with no dependents and a clear job market in their field. Six months fits most families and people with mortgages. Twelve months is more appropriate for self-employed expats with irregular income, single-income households, or anyone with a realistic possibility of needing to return to another country where re-establishing income takes a while.

Importantly, the emergency fund should be liquid and stable — a normal current or savings account, possibly a short-term money market ETF if you want slightly better interest. It should not sit in equities, long-running contracts, or anything that could be down 30% on the day you need it. The whole point is that it is boring and reliable.

The other principle worth holding to: build the fund before you start meaningful long-term investing. The alternative is having a brokerage portfolio that you're forced to sell at the worst possible time, which is exactly the situation the emergency fund is designed to prevent.

Once it's in place, you can mostly forget about it. Top it up if you ever dip into it, re-check the size once a year as life changes, and otherwise let it do its quiet job in the background.