The standard advice is "keep 3-6 months of expenses." That's the equivalent of a doctor saying "take some medicine." It's not wrong, it's just not useful. Here's a framework that gives you an actual number.
Why the Emergency Fund Exists
One purpose: to prevent a bad month from becoming a bad year. Without an emergency fund, a job loss, medical bill, or car repair gets funded with high-interest debt — which then takes 18 months to unwind. The emergency fund breaks that chain.
The Risk Multiplier Framework
Start with 3 months. Then add based on your risk factors:
+1 month if you have dependents
+1 month if you have a single income in your household
+1 month if you're in a volatile or commission-based job
+1 month if you have any chronic health conditions
+1 month if you're a homeowner (high-cost unexpected repairs)
Example: Single income household, two kids, own a home = 3 + 3 = 6 months minimum
Where to Keep It
Your emergency fund has one job: be there when you need it. That means:
- Liquid — accessible within 1-2 business days
- FDIC insured — not subject to market loss
- Separate — not mixed with your checking account
- Earning yield — HYSAs now pay 4-5%+
SoFi High-Yield Savings
- Keeps money separate from daily spending
- 1-2 day transfers when you need access
- FDIC insured up to $2M
- No minimum balance
VaultSignal may earn a commission when you open an account.
What Not to Do
Don't keep your emergency fund in: a money market at your brokerage (subject to T+2 settlement), I-bonds (12-month lockup), CDs (early withdrawal penalty), or your regular checking account (you'll spend it). The separate HYSA is the obvious answer and almost everyone who does it wishes they'd done it sooner.