Definition · forecasting
Top-down forecasting
Top-down forecasting is forecasting from market size or company-level targets down to segments and line items. For top-down forecasting, the useful boundary is the driver, assumption, source data, owner, time period, scenario logic, and decision the model is meant to support.
Also known as top-down planning, top-down approach
Why it matters
Understanding top-down forecasting matters because planning only improves decisions when assumptions, drivers, owners, and time periods are explicit enough to revisit when actuals arrive. When the term is tied to a source system, owner, and review cadence, it becomes easier to audit assumptions, catch changes early, and keep operators aligned.
In practice
Planning example
Teams use top-down forecasting when a forecast, budget, or scenario needs an assumption that can be revisited. The finance team should know the driver, source data, owner, and period before using it in a model.
Review example
Top-down forecasting should be reviewed whenever the source system, calculation logic, time period, or decision owner changes. That keeps the definition useful instead of letting it drift into a label.
In practice, teams should define top-down forecasting with a clear source, owner, time period, and decision before they use it in reporting, planning, or operating reviews.
Understanding top-down forecasting matters because planning only improves decisions when assumptions, drivers, owners, and time periods are explicit enough to revisit when actuals arrive. When the term is tied to a source system, owner, and review cadence, it becomes easier to audit assumptions, catch changes early, and keep operators aligned.
A strong workflow for top-down forecasting separates the definition from the action: first agree what the term means, then decide how it is measured, when it changes, and who is accountable for the next step.
FAQ
What is top-down forecasting?
Top-down forecasting is forecasting from market size or company-level targets down to segments and line items. For top-down forecasting, the useful boundary is the driver, assumption, source data, owner, time period, scenario logic, and decision the model is meant to support.
When should you use top-down vs bottom-up forecasting?
To use top-down forecasting, start with the decision, then confirm the source data, timing, calculation logic, and owner. The analysis is strongest when a reviewer can trace the answer back to the records that produced it.