Run it with less chaos · Every business
Cash Flow, Not Sales, Is Why Many Small Businesses Fail
The median small business holds about four weeks of cash, so a slow month or a late-paying customer can threaten a company whose sales look healthy on paper.
At a glance
- In a JPMorgan Chase Institute study of 597,000 small businesses, the median one held 27 days of cash buffer and a quarter held fewer than 13, while about half of new businesses close within five years according to the Bureau of Labor Statistics.
- In the Federal Reserve's 2024 survey of 7,653 small employers, 56% had trouble paying operating expenses and 51% reported uneven cash flow, even though only 48% named weak sales as a challenge.
- Dividing your bank balance by your average daily spending gives your own buffer days, the one figure that shows how long the business could run if customers stopped paying tomorrow.
The number and where it comes from
The 27-day figure comes from the JPMorgan Chase Institute, which followed about 470 million transactions in the accounts of 597,000 small businesses during 2015 and measured cash buffer days, the number of days a business could cover its typical outflows from its balance with no money coming in. Half held less than a month, a quarter held fewer than 13 days and a quarter held more than 62, and the gaps across industries were wide.
A thin cushion matters because the bills of a service business arrive on schedule while its income does not. Payroll runs every two weeks, rent is due on the first and the card processor settles daily, while a customer's check, an insurance payment or a commercial account on net 30 terms can arrive weeks after the work. The Federal Reserve survey shows how often that mismatch bites; among firms facing a financial challenge, 51% used the owner's personal funds and 48% drew down cash reserves to get through it.
On the question in this article's title, the research is suggestive rather than final. The JPMorgan Chase Institute reported only preliminary evidence that buffer days correspond to small business exit rates, and the widely repeated claim that 82% of small business failures come from cash flow problems could not be traced to a published study with a stated method, so we have left it out. What the data do show clearly is how little room most small businesses have between a good month and a missed payroll.
A worked calculation
Buffer days take one division: cash buffer days = bank balance ÷ (last month's total spending ÷ 30). The example below shows how a single late payment changes the answer for an illustrative business.
| Bank balance (Assumption) | $18,000 |
|---|---|
| Total spending last month (Assumption) | $27,000 |
| Average daily spending (Calculated ($27,000 ÷ 30)) | $900 |
| Cash buffer days (Calculated ($18,000 ÷ $900)) | 20 |
| Invoice paid 30 days late (Assumption) | $9,000 |
| Buffer days while that invoice is outstanding (Calculated (($18,000 − $9,000) ÷ $900)) | 10 |
Illustrative example; replace every assumption with your own numbers.
At 20 days, this business already sits below the 27-day median, and one late customer leaves it ten days from a payroll it cannot cover. Sales did not fall at all in that month, which is the pattern the Federal Reserve data point to when more firms report trouble paying operating expenses than report weak sales.
Widget note for the site: a lean calculator with two sliders (bank balance and monthly spending) and one result, cash buffer days, shown beside the 27-day median and the 23-day median for labor-intensive industries.
How you compare
- Buffer days: the median small business held 27, restaurants 16 and labor-intensive industries 23 in the JPMorgan Chase Institute study; under 13 puts a business in the thinnest quarter.
- Survival: of private establishments that opened in the year to March 2020, 80.9% were still operating a year later and 51.4% five years later, according to the Bureau of Labor Statistics.
- Your own baseline: calculate buffer days on the first of each month for a quarter, and note which customers' payments moved the number most.
The next step is to calculate your buffer days today and list the three invoices that would change it most if they were paid late.
About this research: Figures come from the JPMorgan Chase Institute's study of cash balances at 597,000 small businesses (2015 data, still one of the largest public measures of small business cash buffers), the Federal Reserve Banks' 2024 Small Business Credit Survey and the Bureau of Labor Statistics' Business Employment Dynamics survival tables. The 82% failure statistic often attributed to a bank study was excluded because we could not find a published original. The worked example is illustrative. General information, not legal/tax/financial advice; talk to a licensed professional about your situation.
Sources
- Farrell, D. and Wheat, C. Cash Is King: Flows, Balances, and Buffer Days. JPMorgan Chase Institute, 2016. 597,000 small businesses.
- Federal Reserve Banks. 2025 Report on Employer Firms: Findings from the 2024 Small Business Credit Survey. 2025. 7,653 employer firms.
- U.S. Bureau of Labor Statistics. Business Employment Dynamics, Table 7: Survival of Private Sector Establishments by Opening Year. Data through March 2025.
Related reading: Revenue Isn't Profit: Why Growing Businesses Run Out of Cash · Half of New Businesses Close Within Five Years; Here's What the Survivors Do Differently · The 30-Minute Weekly Money Check: Invoices, Bills, Tax Savings and Payroll · Gross Margin vs. Net Profit, Explained for Owners
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