What Is Forecasting?
Forecasting is the process of predicting a business's future financial performance — revenue, expenses, and cash flow — using historical data, current trends, and assumptions. It helps owners plan ahead, anticipate shortfalls, and make informed decisions.
What forecasting is and why it matters
A forecast is a forward-looking estimate that's updated as reality unfolds — distinct from a budget, which is a fixed plan for a period. Forecasting draws on past results and known drivers (pipeline, seasonality, contracts) to project what's likely to happen, then flexes as new data arrives. It's central to cash-flow management (will we have enough cash next quarter?), hiring and investment decisions, and advisory work. Good forecasting doesn't aim for perfect prediction; it aims to reduce uncertainty enough to act with confidence and to catch problems early.
A worked example
A business forecasts next quarter's cash. It starts with an opening balance of $40,000, projects collections of $180,000 based on its receivables and sales pipeline, and expects $200,000 in outflows (payroll, rent, suppliers). The forecast shows a closing balance of $40,000 + $180,000 − $200,000 = $20,000 — positive but thin. Seeing this early, the owner can delay a discretionary purchase or accelerate collections before the crunch hits.
How firms handle it today
Firms build forecasts in spreadsheets or FP&A tools from the client's historicals and assumptions, refreshing them as actuals come in and comparing forecast to actual to sharpen future estimates.
Related terms
FAQ
What's the difference between forecasting and budgeting?
A budget is a fixed target set for a period; a forecast is an updated projection of what's actually likely to happen.
What data is used for forecasting?
Historical financials, current trends, pipeline and contracts, seasonality, and management assumptions.
How often should forecasts be updated?
Frequently — many businesses use rolling forecasts updated monthly or quarterly as new actuals arrive.