Key takeaways
- Coverage = accessible cash ÷ essential monthly expenses — measured in months, not dollars.
- Essentials are the bills that continue when income stops; lifestyle spending pauses.
- Dividing the remaining gap by a monthly set-aside turns the target into a date.
The formula is a division
Coverage is accessible cash ÷ essential monthly expenses. Essential means the bills that continue when life goes sideways — housing, food, utilities, insurance, minimum debt payments — not the full budget. Using total spending understates your real runway; using income makes no sense at all, since an emergency is precisely when income stops.
Example · same cash, honest denominator
Cash of $9,000 against total spending of $3,600/mo looks like 2.5 months. Against essential spending of $2,400/mo it is 3.75 months — the same money, correctly measured.
Why months, not a round number
“$10,000” sounds prudent and means nothing without context — it is five months for one household and six weeks for another. Months of essentials is portable across incomes and honest across time: raise your rent and the same balance covers fewer months, which is exactly the truth.
How much is enough
Common targets run three to six months of essentials — more for variable income, single-earner households, or thin job markets; sometimes less where safety nets are strong. The target is a personal risk decision. What the arithmetic contributes is a clear reading of where you stand against whichever target you choose.
From gap to date
Once a target exists, the gap divided by a monthly set-aside becomes a date: a $6,000 shortfall at $300/month is twenty months. That conversion — gap to timeline — is what turns a vague intention into a line item.
↑ Back to topOpen Spending. Mark expenses essential and the coverage badge, target, and funding date all compute from your entries.
Open in Capital Allocation →