Your $2,500 starter fund stops surprises from becoming debt. The full fund stops a real crisis — a layoff, a serious illness — from derailing the whole plan.
Without three to six months in reserve, a real crisis forces the worst choices: raiding retirement accounts (with taxes and penalties), taking on high-interest debt, or accepting the first job offer instead of the right one.
The typical job search after a layoff. Your fund needs to outlast that window comfortably.
Size it on essential expenses, not total spending: housing, utilities, groceries, insurance, minimum debt payments, and basic transportation — the things you'd still pay in a crisis. If you spend $5,000 a month but essentials are $3,000, a 6-month target is $18,000, not $30,000.
Track one number: months covered = balance ÷ monthly essentials.