The One Number Your Banker Checks Before You Do

For 20 years, before I ever became the owner of a bookkeeping and CFO advisory firm, I sat on the other side of the loan desk. Business owners across Montgomery County and Houston, TX would come in with their financials, hoping for a yes. And before I looked at revenue, before I looked at profit, I looked at one number first: how many weeks this business could survive if income stopped tomorrow.

That's cash runway. And it's the single most telling number in a small business — more telling than your P&L, more telling than last year's revenue growth, more telling than almost anything else in your books.

Here's why bankers check it first. Revenue tells you what came in. Profit tells you what's technically left over. Neither one tells you whether you can actually make payroll if a client pays 30 days late, or a slow month hits during peak expenses. Cash runway does.

How to find your number

Add up your available cash — checking, savings, any liquid reserves. Divide it by your average monthly operating expenses. That's roughly how many months you could operate with zero incoming revenue.

Most healthy service businesses aim for 1–3 months of runway at minimum, with 3–6 months being genuinely comfortable. If your number is under a month, that's not a crisis — it's information. It tells you exactly what to fix first.

Why this number moves before your P&L does

Profit and cash are not the same thing, and this trips up more business owners than almost anything else in bookkeeping. You can be profitable on paper and still be cash-poor in reality — a client who's 45 days late, an equipment purchase, a slow season you didn't plan cash around. None of that shows up as a "loss." It shows up as a gap. Cash runway is how you see the gap coming instead of discovering it in your bank balance.

What lenders actually do with this number

When I reviewed a loan file, I wasn't just checking if a business could survive — I was checking if it could survive and take on more obligation. A business with thin runway asking for a loan is asking to make its own cash position tighter, not looser. Same idea applies whether you're seeking financing, taking on a client with upfront costs, or just trying to sleep better at night.

Building runway on purpose, not by accident

The businesses I see with healthy runway didn't get there by luck. They built it on purpose — usually through three things: knowing their weekly cash position (not just monthly), timing collections deliberately instead of hoping clients pay on time, and setting a specific reserve target instead of "saving whatever's left."

If you want the full week-by-week version of this — a rolling projection instead of a single snapshot — that's exactly what a 13-week cash flow forecast gives you. We wrote about that in detail here.

Where to start

Your runway number is a snapshot of where you stand today. The next question is what it takes to build that number on purpose — and that starts with the same figure: your average monthly expenses. Use our free Calculate My Revenue Goal tool to turn that number into a real revenue target, not a guess, or if you'd rather talk it through first, book a free Beyond Bookkeeping call and we'll go through your numbers together.