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A business can be profitable on paper and still run out of money — and the first year, before revenue is predictable, is exactly when that gap is most dangerous.

Why the First Year Is the Riskiest

Roughly 20% of small businesses fail in their first year, and 82% of small businesses that fail cite cash flow problems as a contributing or primary cause — not lack of profitability, lack of cash on hand when a bill is due. About 29% of startups fail specifically because they ran out of cash. The median small business holds only about 27 cash-buffer days, and roughly a quarter hold 13 days or fewer, meaning a single delayed customer payment can flip a business from solvent to insolvent within two weeks.

Separate Personal and Business Cash From Day One

Commingling founder and business accounts in year one makes it almost impossible to see the real runway number, and it’s the single most common mistake that makes an already-thin cash position harder to manage. A dedicated business checking account, even before incorporation is finalized in some states, should be the first financial decision made.

Build the Runway Number Before You Need It

Calculate a real pre-revenue burn rate (fixed costs plus minimum variable costs) and divide it into current cash to get a runway in months, updated monthly, not estimated once at launch. Lining up a business line of credit before you need it (see our comparison of a business line of credit vs. a business credit card) is far easier when the business isn’t already in a cash crunch — lenders want to see the account before it’s desperate.

Track Weekly, Not Monthly

A monthly view hides the exact week a shortfall will actually hit. Building a simple weekly cash flow view — the same discipline covered in our 13-week cash flow forecasting model — is worth adopting from week one, not after the first scare.

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