A rolling forecast is a forecast that always looks the same distance ahead, for example the next 12 or 18 months. Each month, the month just closed drops out, actuals replace the forecast for it, and a new month is added at the end. It keeps planning current instead of stopping at the end of the fiscal year.
What is a rolling forecast?
A traditional budget covers a fixed fiscal year, so by October it only looks three months ahead. A rolling forecast keeps the horizon constant. Many companies run it beside the annual budget rather than instead of it: the budget stays the target, and the rolling forecast is the current best estimate.
Rolling forecasts work best when they are driver-based: revenue from volumes and prices, payroll from headcount, other costs from activity. Updating a handful of drivers each month is faster than rebuilding hundreds of lines.
How does a rolling forecast work?
- Choose the horizonTwelve months is a common minimum. Eighteen or 24 months let you see past the year end; longer horizons suit capital and financing plans.
- Pick the driversChoose the few inputs that move the result most, such as volumes, prices, headcount and key cost rates.
- Start from actualsAfter each close, replace the forecast for the month just closed with the actual figures from the ledger.
- Update the driversRevise the drivers for the months ahead from what you now know: orders, prices, hiring and costs.
- Add a monthExtend the forecast by one month at the end, so the horizon stays the same length.
- Compare and explainCompare the new forecast with the budget and with last month's forecast, and explain what changed and why.
What does a rolling forecast look like in practice?
Why does a rolling forecast matter?
Decisions on hiring, stock, capital spending and financing need a view beyond the current year end, and a forecast a few weeks old is more useful than a budget set many months ago. Comparing actuals with both, through budget vs actual, shows performance against the target and against current expectations.
Watch two risks. Forecasts can drift towards the budget because nobody wants to report bad news, and too much detail makes each update slow. Track forecast accuracy against actuals, and keep the model to the drivers that matter.
Cash needs a shorter and more detailed view. A 13-week cash flow forecast sits beside the rolling forecast, week by week.
Questions people ask
Does a rolling forecast replace the budget?
Usually not. Many companies keep the annual budget as the target and for performance reviews, and use the rolling forecast to see where results are heading. Replacing the budget entirely is a bigger change to how targets are set.
How long should a rolling forecast be?
Twelve months is a common minimum, because it always shows a full year ahead. Eighteen or 24 months help when next year must be planned before it starts, or when financing decisions look further out.
How often should a rolling forecast be updated?
Monthly after the close, or quarterly for steadier businesses. The update should take days, not weeks; if it takes longer, the model has too many inputs.