How Long Could Your Business Survive Without New Revenue?

A profitable business can still close its doors. The number that tells you how exposed you are is your cash runway, and it takes about a minute to find.

A business can look profitable on paper and still run out of road. It happens more often than most owners expect, and the reason is almost always the same. Profit is an accounting result. Cash is what pays your rent, your team, and your tax bill. When the two fall out of step, cash wins every time.

This issue is about one number that measures how exposed you are: your cash runway. It is simple to calculate, and once you know it, you can stop guessing about how much cushion you really have.

Here is the number

Your cash runway is the number of months your business could keep operating if new revenue stopped today.

Cash runway (in months) = cash on hand  ÷  average monthly operating expenses

Cash on hand is money you can reach: your business checking and savings, not money tied up in unpaid invoices or inventory. Operating expenses are what it costs to keep the doors open in a normal month, including rent, payroll, your own pay, insurance, software, loan payments, and supplies.

A short example. A small design studio (a composite of several clients) keeps $24,000 in the bank. A normal month costs $12,000 to run. Its cash runway is:

$24,000 ÷ $12,000  =  2.0 months

That studio could operate for about two months with no new money coming in. Not two years. Two months.

What it means

Runway turns a vague worry, are we okay on cash, into a specific and testable answer. Two months of runway is not a failing. It is information. It tells you how much room you have to absorb a slow season, a client who pays late, or a surprise repair before the pressure becomes urgent.

The federal government's own small business training curriculum, the FDIC's Money Smart for Small Business, teaches this directly. One of the best ways to protect a business from cash flow problems is to build and hold a cash reserve, a fund you can draw on when a need arises. Runway is simply how you measure whether that reserve is thick enough.

Why it matters

This is not a fringe problem. In the Federal Reserve's most recent Small Business Credit Survey, about half of small employer firms named uneven cash flow as a challenge, and more than half pointed to paying operating expenses. These are not failing businesses. They are ordinary firms living closer to the edge of their runway than they would like.

The longer view is just sobering. U.S. Bureau of Labor Statistics data on business survival shows that only about half of new establishments are still operating five years after they open. Cash timing is rarely the headline in those closures, but it is very often the mechanism. Businesses do not close because it ran out of profit. It closes because on one specific Friday there was not enough cash to make payroll.

What good looks like

There is no single correct runway for every business. A steady firm that bills on a recurring plan can run leaner than a seasonal business or one that works project to project. As a planning range, SCORE, the nonprofit resource partner of the U.S. Small Business Administration, points owners toward roughly three to six months of operating expenses held in reserve.

Hold that up against the studio in our example. Three months of coverage would mean about $36,000 in reserve. Six months would mean about $72,000. At $24,000, the studio is not in crisis, but the gap between where it is and where it would be comfortable is now a number it can plan around instead of a feeling it tries to ignore.

What to check next

1.     Calculate your true monthly cost. Pull the last three months of expenses, add them, and divide by three. Averaging smooths out the odd large month so your runway reflects reality.

2.   Separate fixed from variable. Fixed costs such as rent, insurance, and salaried pay continue whether or not you sell anything. Variable costs move with your sales. Knowing the split tells you how fast you could cut in a slow stretch, which is the same as knowing how far you could stretch your runway.

3.   Watch what you are owed. Money sitting in unpaid invoices is not runway. Track how old your receivables are. If clients routinely pay late, your real runway is shorter than your bank balance suggests.

4.   Set a reserve target and fund it on a schedule. Pick a number of months that fits your business, translate it into dollars, and move a set amount into reserve on the same day each month. A reserve you fund automatically is a reserve that actually grows.

The CFO view

Most owners look at cash once a month, usually when something is already tight. A fractional CFO looks at it forward: what the runway is today, where it is heading, and which levers extend it before a shortfall turns into a scramble. That is the difference between reacting to cash and managing it.

If you want a clear, current read on your own runway and a plan to strengthen it, that is exactly what a Profit Audit delivers.

Curious how many months of runway your business has right now? Let's find the number together and build a plan to widen it.

Book a consultation:  parksprojectsnj.setmore.com

Profit. Tax. Capital. One CFO.

Sources

Federal Reserve Banks. 2025 Report on Employer Firms: Findings from the 2024 Small Business Credit Survey. fedsmallbusiness.org

U.S. Bureau of Labor Statistics. Business Employment Dynamics, survival of private sector establishments. bls.gov

Federal Deposit Insurance Corporation. Money Smart for Small Business, Module 10: Managing Cash Flow. fdic.gov

SCORE, a resource partner of the U.S. Small Business Administration. Guidance on business cash reserves. score.org

Client examples in this newsletter are composites drawn from common situations and do not represent any single client.