How to Build a 3-Month Emergency Fund

PERSONAL · FOUNDATIONS · 6 MIN · Filed by Johnnie

The exact steps to get there, with numbers.

Three months of essential spend, parked in a high-yield account, contributed to automatically — that's the whole thing. Everything below is how to actually do it.

Procedure

Frame the goal in a dollar figure, not a feeling. Add up one month of essential spend — rent, utilities, groceries, insurance, minimum debt payments. Multiply by three. That's your target.
Pull the three statements that show where you are today. Current savings, monthly take-home, monthly essential spend. Write them on one line. If the gap is less than 6 months of automation, skip to Step 04.
Open a separate high-yield savings account (HYSA). Not the same bank as checking. The separation is the point — friction is a feature. Aim for ≥ 4% APY in 2026.
Automate the boring 80%. Review the other 20% monthly. Schedule the transfer the day after payday. Check the balance at the end of the month, not the end of the week.
Re-check against your plan every 90 days. Life changes. Rent goes up, jobs change, the target moves. Recalculate once a quarter and adjust the automation.

Key figures

TARGET:
2,400 — 3 months essential spend
TIMELINE: 18 MO — at $689/mo, automated
RATE: 4.35% — HYSA, 26-wk avg

About the writer

Johnnie — Personal finance — formerly retail trading desk, Chicago. Johnnie spent a decade on a retail trading desk before walking away to write for people who were never meant to read a 10-K. He answers the money questions you're a little embarrassed to ask.