How To Forecast Cash Flow
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Cash flow vs profit — why they diverge
Most small businesses that fail are profitable on paper — they run out of cash. Profit and cash flow are different numbers, and the gap between them kills more companies than any other single cause. A proper cash flow forecast shows, month by month, whether you can pay bills, meet payroll, and fund growth. This guide walks through building a 13-week forecast, the categories that matter most, and the handful of signals that tell you cash is about to be tight.
The 13-week rolling forecast (the standard)
An agency invoices $50k in January (revenue recorded). Client pays in March. Rent, payroll, and SaaS still hit in January and February. On paper January was profitable; in reality the bank account dropped $70k before any cash arrived.
Categorize cash flows the right way
The three accounting things that cause the gap:
Step 1 — forecast AR collections realistically
13 weeks is the CFO-standard horizon: long enough to see the next payroll cycle, quarterly tax, and big AR collections; short enough that predictions are still realistic.
Step 2 — commit to payment timing, don’t estimate
Structure:
Step 3 — add a sales forecast with honesty discount
Update every Monday. Takes 30 minutes once built. The discipline of updating is the value — forces you to notice when forecasts drift.
Signal #1: The minimum balance watchtower
Accounting standards split cash flow into three categories — helpful for spotting what’s really happening:
Signal #2: Growing AR aging buckets
A business with positive operating cash flow but collapsing total cash is funding growth from the balance sheet. A business with negative operating cash flow and positive financing cash flow is living on the last round — dangerous.
Signal #3: AP terms being stretched
The #1 source of cash forecast error is assuming invoices are paid on the due date. They’re often not.
What to cut when cash is tight
Customer-level adjustment: big customers with long AP cycles pay in 60–90 days. Assume that. Small customers often pay faster. Build an aging profile into the forecast, not an average.
Run the numbers
Most outflows are known with certainty once you have the data: