Forecents Guides

How long could your family last without income? Run a runway drill

Published August 20, 2026 · 6 minute read

Layoff rumor. Contract not renewed. A business having a bad quarter. The moment the thought arrives — what if the paycheck stopped? — most people do one of two things: push it away, or lie awake with it.

There's a third option: run the drill. Pilots practice engine failures on purpose, in a simulator, precisely so the real thing is a procedure instead of a panic. Your finances deserve the same. The question "how long could we last?" has an actual, computable answer — and knowing it changes everything about how the uncertainty feels.

Here's the drill, by hand. Twenty minutes, once. (At the end: how to run it live, continuously, against your real accounts.)

Step 1: Count the cash you'd actually use first

Checking and everyday accounts — use the available balances. This is wave one of your defense: the money that needs no decisions.

Step 2: Count your reserves — honestly, in order

List everything you would genuinely draw on, in the order you'd draw it:

• Savings — designed for exactly this; counts at face value.
• Taxable investments — takes days to sell, may create taxes.
• Retirement accounts — last resort: early withdrawal usually means penalties plus taxes, so what's on the statement is not what reaches your checking account. Count it, but mark it.
• Things you could sell — the second car, the boat. Real, but slow and uncertain. Most drills should leave these out and treat them as a bonus.

The discipline is writing down what each is really worth to you in a pinch, not what the statement says.

Step 3: Total the monthly burn — the survival version

Every bill that keeps coming when income doesn't: housing, utilities, insurance, minimum debt payments, groceries, gas. Then mark what you'd cut in month one — streaming, eating out, subscriptions you forgot. You now have two burn rates: current and tightened. Run the drill with both; the gap between them is your first lever.

Step 4: Walk it forward to the date

(Cash + reserves you'd actually use) ÷ monthly burn ≈ months of runway. But the honest version walks it month by month, because bills aren't smooth — insurance lands quarterly, a car registration hits in March. Walk the balance forward and find the month it crosses zero. That date is your runway.

Write the date down. For most households it's further out than the 3am version of the question feels — and if it isn't, better to know on a calm Tuesday than during the event.

What the number is for

A runway date turns vague dread into decisions with deadlines: how big the emergency fund actually needs to be, which debt payment is worth eliminating (each one you clear extends the runway), how long you could hold out for the right next job instead of the first one. None of that is possible while the question stays a feeling.

Running the drill live

The by-hand drill is a snapshot; reality moves weekly. Full disclosure — we build Forecents, and this exact drill is built in: it links your accounts read-only, already knows your bills and paychecks, and its What-if panel has a one-click "3-month no-income drill" — it stops your detected income, commits your savings, walks your real balance forward a full year, and gives you the date. Your dashboard also carries a permanent Runway tile, so the answer stays current as your life changes. It was built by someone who needed the answer himself, the week the income news came.

Either way — notebook or software — run the drill. The date is almost never as frightening as the fog.