● Money & small business
How long does it take to build an emergency fund? A 9-month example, and the math for yours
"Three to six months of expenses" is the standard advice, and it sounds like a number you either have or don't. In practice an emergency fund is built one deposit at a time, and gets used along the way. Here's nine months of one example fund, from the sample file of our emergency fund tracker.
Step 1: the target is essentials, not your whole budget
The fund has to cover what you'd still pay if your income stopped: rent $1,650, utilities $210, groceries $520, car payment $340, car insurance and gas $260, phone and internet $120, health insurance $290, minimum debt payments $150 and $110 of other essentials. That's $3,650 a month, and six months of it is a $21,900 target. Restaurants, subscriptions and extra debt payments are the first things you'd cut, so they're left out. If you used a whole monthly budget of, say, $5,200 instead, the target would jump to $31,200 for no good reason.
Nine months of real life
| January to September | Amount |
|---|---|
| Starting balance | $2,400.00 |
| Nine monthly deposits of $650 | +$5,850.00 |
| Tax refund (April) | +$1,200.00 |
| Interest | +$79.35 |
| Car repair (March) | −$480.00 |
| Vet bill (July) | −$310.00 |
| Balance at the end of September | $8,739.35 |
Two withdrawals, $790 in total, and nothing went on a credit card. That's the fund doing its job, not a setback. The balance now covers 2.4 months of essentials.
What's left, and how long it takes
Every milestone is the gap divided by the monthly deposit, rounded up to a whole month:
- 1 month ($3,650) and the $1,000 starter goal: done.
- 3 months ($10,950): $2,210.65 to go, 4 more deposits, so January 2027.
- 6 months ($21,900): $13,160.65 to go, 21 more deposits, so June 2028.
The monthly deposit is the lever:
| Monthly deposit | Months to the full $21,900 |
|---|---|
| $300 | 44 |
| $500 | 27 |
| $650 | 21 |
| $1,000 | 14 |
| $1,500 | 9 |
These assume no more withdrawals, and there will be some. A tax refund or a bonus shortens it a lot: April's $1,200 refund was worth almost two months of deposits.
Building yours
- List only essential monthly costs. Multiply by 3 if your income is steady and shared, and by 6 or more if it's irregular or you're the only earner.
- Pick a monthly deposit you can keep, and make it automatic on payday.
- Log withdrawals honestly, and refill before you restart other goals.
- Keep it somewhere separate and boring, where you can get at it in a day or two.
The free emergency fund calculator gives you the target and the month you'll reach each milestone. Every figure above is from the sample file of our emergency fund tracker, where the plan and all 24 months were recomputed independently. Not financial advice.