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A revenue forecast doesn't need to be sophisticated to be useful. Its real job is to give you enough warning to act — hire, cut back, chase receivables harder, or build a cash cushion — before the month you're forecasting actually arrives.
Start with what's already committed
The most reliable part of any forecast is revenue that's already agreed: signed contracts, recurring invoices, retainers, and accepted quotes for work already scheduled. List these first, by the month you expect to invoice them.
Add likely work, discounted honestly
Next, add work that's probable but not confirmed — proposals out, repeat clients who usually order around this time. Don't count these at full value; weight them by how likely they genuinely are. A proposal you'd put at 50% odds counts for half its value in the forecast.
Separate invoiced from collected
Revenue invoiced in March isn't cash in March. If your clients typically pay in 30–45 days, shift the expected cash into the month it will actually arrive. Your DSO is a good guide to how far to shift it. Forecasting both — revenue and expected cash — shows you timing gaps a revenue-only forecast would hide.
Use three scenarios, not one number
A single forecast figure implies more certainty than exists. A cautious case (committed revenue only), an expected case (committed plus weighted likely work), and an optimistic case give you a range to plan against — and the cautious case is the one to make sure your fixed costs can survive.
Compare against reality every month
The most valuable part of forecasting is checking it afterward. Where you were consistently too optimistic or too cautious tells you how to adjust next time — after a few months, your forecasts get noticeably more accurate simply because you've learned where your own guesses tend to be off.