Business Cash Flow Explained
A profitable business can still go broke. The reason is cash flow — the timing of when money actually moves in and out of your bank account. This guide explains business cash flow in plain language, with examples for Etsy, eBay, Shopify, KDP, and Amazon FBA sellers.
What cash flow means
Cash flow is the movement of money in and out of your bank account over a period — inflows minus outflows. The critical word is timing: when money actually arrives or leaves, not when a sale or expense is recorded. Cash balance is what's available right now; runway is how long it lasts at your current burn rate.
Cash flow vs profit
Profit is accrual-based: revenue minus expenses regardless of when cash moves. Cash flow is when money physically lands or leaves. You can post a profitable month and still see your bank balance drop $3,800 because customers haven't paid yet or you bought inventory upfront.
Why profitable businesses fail
The growth trap (more sales → more inventory paid for before payouts arrive), the timing gap (you pay suppliers before customers pay you), tied-up cash (inventory and reserves), seasonality (build inventory before the peak when cash is tightest), and surprise expenses with no buffer.
Operating cash flow
Cash from core operations — sales payouts in, supplier/platform/shipping/software/tax payments out. The heartbeat of the business: consistently negative operating cash flow (outside a deliberate growth phase) is a serious warning sign that no financing will fix.
Investing cash flow
Longer-term assets: equipment, software builds, larger inventory purchases meant to support future growth. Negative investing cash flow is normal in growth phases — it's how you scale.
Financing cash flow
Loans and credit lines in or out, owner contributions and draws, investor capital. Financing covers timing gaps; it doesn't replace healthy operating cash flow long-term.
Cash flow by platform
Etsy and Shopify: near-daily payouts. eBay Managed Payments: 1–3 day payouts. Amazon: every ~2 weeks with reserves. KDP: ~60 days after the sale month. The less inventory you hold and the faster you're paid, the easier your cash flow.
Build a cash flow worksheet and buffer
Monthly: beginning balance → operating inflows − operating outflows → investing → financing → ending balance. Forecast the next 3–6 months so you can see crunches coming. Keep a 3–6 month expense buffer — businesses fail from a hundred small leaks, not one big mistake.
Frequently asked questions
- Can a profitable business still go broke?
- Yes — by running out of cash. Timing gaps, inventory tied up in stock, slow payouts, and the growth trap all drain cash while profit looks fine on paper.
- What is the growth trap?
- When growing sales actually drain cash because you must buy ever-larger inventory upfront before customers pay you. The faster you grow, the more cash is locked in stock.
- How big a cash buffer should I keep?
- Aim for 3–6 months of fixed expenses. Seasonal or inventory-heavy businesses should target the higher end of that range.
- How often should I track cash flow?
- Monthly at minimum — record actuals against your bank statement and forecast the next 3 months. Inventory-heavy or seasonal businesses benefit from weekly checks.
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Related Calculators
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Project ending cash and see if you cover your buffer.
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