It sounds contradictory, but plenty of profitable businesses run out of cash. It happens more than people expect and it's one of the main reasons small businesses fail, not because they weren't making money, but because the money wasn't there when they needed it.
The gap between sending an invoice and getting paid is where the problem lives. If your payment terms are 30 days and a client pays at 45, but you've got wages and rent due in the meantime, you have a problem regardless of what your profit and loss says.
A few things help. The first is knowing your numbers, not just revenue, but when cash actually arrives and when it actually leaves. A simple 90-day cash flow forecast isn't complicated to build and it changes the way you make decisions.
The second is tightening your payment terms. Net 30 is standard but it's not mandatory. Some businesses run on 7-day terms. Some take payment upfront. The closer your payment terms are to zero, the less cash flow stress you carry.
The third is following up invoices. Chasing money is uncomfortable but it's part of running a business. An invoice that's 60 days overdue isn't just annoying, it's a loan you never agreed to give.
If cash flow is a persistent problem, it's worth mapping out where the gaps are before assuming the business isn't viable. Often it's fixable. Often it just requires
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