How large should your financial buffer be before you start investing?

Investing is generally for money that you can leave untouched for a longer period. Investments fluctuate in value, and the market may be going through a downturn just when you need the money.

A buffer therefore serves a very different purpose from your investments. Its job is not to earn the highest possible return. It needs to be available when you need it.

Think of a washing machine that suddenly breaks down, an unexpectedly high car repair bill or a temporary drop in income. With enough money in reserve, a setback like this is less likely to force you to borrow or sell investments at an inconvenient time.

There is no fixed rule that determines exactly how large your buffer should be.

Wikifin, the FSMA's financial education programme, uses three to six times your monthly net income as a general guideline. It also stresses that there is no hard-and-fast rule: the reserve you need depends on your income, expenses and personal circumstances.

A simple example makes this more concrete:

These examples are only meant to make the scale more tangible. Your ideal buffer depends on your own situation.

Treat the range of three to six times your monthly net income as a starting point, not as a threshold that is right for everyone.

Imagine, for example, that two people earn exactly the same amount. One lives with a partner who also has a stable income, while the other lives alone and has a variable income. The same buffer would not necessarily give both of them the same level of financial security.

The more uncertainty you need to absorb yourself, the more useful it can be to have some extra financial breathing room.

Someone with a variable income or lower job security is in a different position from someone whose income is very stable. Children, a mortgage, a car that you depend on for work or other high fixed expenses can also affect how much of a reserve feels comfortable.

So the most useful question may not be: do I have exactly six times my monthly net income as a buffer?

A better question is: what happens if my income falls for a while or a large unexpected expense comes up?

If you can absorb that situation without immediately dipping into your investments, your buffer is doing what it is meant to do.

A buffer is there for unexpected events. That is different from money you set aside for an expense you already know is coming.

Planning a big trip in two years? Expecting to replace your car soon? Saving for renovation work? Those are expenses you can save for separately.

You can keep these different purposes clearly separated:

• Saving for planned expenses

  For expenses you already know are coming.

• Financial buffer

  For unexpected costs or a temporary loss of income.

• Long-term investing

  For money you will not need for a long time.

There is no single perfect amount that works for everyone. The often-cited range of three to six times your monthly net income can provide a first reference point, but your own financial situation still matters.

A good buffer mainly gives you breathing room. The aim is not to keep as much cash as possible sitting in a savings account. It is to have enough room for an unexpected setback without immediately disrupting your broader financial plan.

That is what makes a buffer such an important foundation before you start investing.