How Big Should Your Emergency Fund Really Be?

Why three months is only a starting point

The standard advice is to save three months of expenses. That number works for a salaried worker with stable income and no dependents. It is too thin for everyone else, and the reason is income risk, not spending.

Your reserve exists to cover the gap between losing an income stream and replacing it. The size of that gap is what you should size to, not a round number someone picked.

Start with your true monthly burn

Add up what you actually must pay each month: rent or mortgage, utilities, food, transport, insurance minimums, and the minimums on any debts. Leave out discretionary spending you would cut on day one. That lower figure is your survival number, and it is the one a reserve has to cover.

If survival spending is 2,400 a month, then three months is 7,200. If it is 4,000 a month, three months is 12,000. Same rule, very different cash.

Then scale for how long replacement takes

The multiplier is how long it takes you to replace the income, not how much you earn:

• One stable job, two months to replace: 3 months is reasonable.
• Single income, specialised role, six months to replace: aim for 6 months.
• Freelance or variable income: 9 to 12 months, because the income itself is the risk.
• Two stable incomes in different fields: you can hold less, because both rarely stop at once.

A worked example

Say survival spending is 3,000 a month and your role typically takes five months to replace. Target 5 x 3,000 = 15,000. If a layoff is common in your industry, add two months of buffer: 7 x 3,000 = 21,000.

Keep it boring and liquid

A reserve is not an investment. It sits in a high-yield savings account or a money market fund where you can move it in a day. Do not chase yield with it; the job of this money is to be there, not to grow.

Build it in stages. Hit one month first, then three, then your target. A reserve you actually finish beats a perfect number you never reach.