Cash Runway: How to Know If Your Business Is Safe

Your bank balance can look safe while your cash runway is already short. Cash runway is the number of months your current cash can cover fixed monthly expenses. It is how long the business can stay open if sales stop or slow. Profit on paper does not pay rent; cash does. Runway is the number to check before you hire, buy equipment, or expand.

The warning sign is a shrinking runway, not a single bad month. In a nationwide survey conducted from March 4 to March 10, 2026, cash flow was the leading concern for small businesses at 31 percent, ahead of inflation at 29 percent, for the first time.

The worksheet turns your bank balance into a warning line for the next decision: whether to cut costs, chase invoices, or arrange financing. It takes a few minutes each month.

• List fixed monthly expenses.
• Count usable cash.
• Divide usable cash by fixed monthly expenses.
• Set a three-month warning line.

Fixed costs set the monthly minimum

The monthly minimum is a short list: rent, payroll, insurance, software, loan payments, and any recurring cost that appears whether you sell or not. Keep the list short enough to finish quickly. Review recent bank statements and sort each charge. Repeating charges are fixed. Charges that jump when you take a job are variable. When unsure, include them; a higher total makes the runway shorter and safer.

Leave out variable costs that rise with sales, such as materials or delivery. They matter, but they do not define the minimum cash needed to keep the business open. Fixed costs belong in the monthly minimum when you would still pay them in a slow month. That total is the cash you must cover each month.

Usable cash is the cash you can access

Count only money in business checking and savings accounts that you can access without penalty. Do not count accounts that require a fee or waiting period. The result is a single number, not a list of balances you hope to collect. Check the balance on the same day each month so the number stays comparable. Set a monthly reminder in a cash management app; the habit matters more than the tool.

Money for payroll, taxes, or promised supplier payments is no longer free. A promised payment is a claim on the cash. Owners often count a balance that is already committed, and the runway looks longer than it is. Separate personal and business money first when they share an account. Clean numbers beat comfortable ones. The usable cash figure is the number you will divide by fixed monthly expenses.

Divide to get months of runway

Divide usable cash by fixed monthly expenses. You get a simple number: months of runway. Treat that number as the minimum. It assumes sales do not improve, no new bills arrive, and the cash is not spent on anything beyond the fixed list. When your actual runway is shorter, the problem is already visible.

Update it on the same monthly date. Businesses can look safe now and unsafe by the next update.

A three-month warning line turns the number into action

Set the warning line at three months. The finished worksheet has a marked number and a plan for what you will do when you reach it. Write the plan before you need it. The line should be visible on the worksheet. When runway falls below the warning line, call overdue customers, pause nonessential subscriptions, and request a short-term line of credit. Prewritten plans beat panic decisions.

More than 76 percent of small businesses avoided traditional banks when seeking capital. Access to credit shaped strategy for 46 percent of small businesses in Q1 2026. The best time to ask for help is before the runway is short. The worksheet gives you a date to act before your cash limits your choices.

This article is general information, not tax or financial advice. Consult a qualified professional about your situation.