A forecast states what a revenue team expects to happen. Guidance states what leadership commits to in front of the board or an investor group. The two are different instruments with different tolerances, and the gap between them is deliberate. Guidance sits below the forecast so that ordinary forecasting error lands as an overdelivery rather than a miss.
Two numbers with two jobs
The forecast is an operating tool. It moves as deals progress, close dates shift, and new pipeline enters. Moving is the point, because a forecast that never changes has stopped reading the period.
Guidance is a governance tool. It gets set once at the start of the period and should hold. A board plans hiring, spending, and cash against the committed number, so every revision imposes a cost beyond the number itself. A team that revises guidance monthly has effectively told its board the commitment carries no information.
Size the buffer from measured error
The gap between the two numbers is often set by instinct, which is how it ends up either wasteful or worthless. The disciplined version starts with history. Measure how far your forecast has landed from actuals over recent periods and in which direction, then set guidance so a repeat of that error still clears.
Forecast accuracy on new and expansion business typically lands near 90% in ORM's experience, and getting there takes substantial manual work that goes stale as conditions change. ORM targets 95% without manual adjustment, holding from day 1 through day 90 of the quarter. The difference is not academic. A team that can defend tighter error can guide closer to its forecast and keep the headroom it would otherwise give away.The gap should close as the period runs
On day one of a quarter, the buffer is wide because the outcome depends heavily on business that has not been created yet. By the final month, most of the quarter is decided and the remaining uncertainty is small. If your guidance never moves toward your forecast as evidence accumulates, one of two things is true. Either the forecast is not actually getting sharper, or leadership does not believe it.
Watching that convergence is a better read on forecasting maturity than any single accuracy figure. A sales forecast that tightens predictably through a period gives leadership room to commit earlier and more precisely, which is the entire practical payoff of forecasting well. The mechanics behind that convergence are covered in how to forecast revenue.
Frequently Asked Questions
What is the difference between guidance and a forecast?
A forecast is an estimate of what will happen, updated as evidence arrives. Guidance is a commitment made to a board or investor group, set deliberately below the forecast so normal error does not turn into a miss. The forecast is an operating instrument that moves weekly. Guidance is a governance instrument that should move rarely.
How far below the forecast should guidance sit?
Size the gap from your own measured forecast error rather than from instinct. Look at how far your forecast has landed from actuals over the past several periods and in which direction, then set guidance so a repeat of that error still clears the committed number. A team that has never measured its error has no basis for choosing a buffer.
When should you change guidance mid-period?
When an assumption underneath it breaks in a way the period cannot absorb, such as a large deal disqualifying or a pricing shift that resets deal sizes. Do not adjust guidance for ordinary week to week movement in the forecast. That movement is exactly what the buffer exists to cover, and revising the commitment every time the forecast twitches destroys its meaning.
Who sets guidance?
The CEO and CFO set it, using the forecast the revenue organization produces. Separating the roles keeps the forecast honest. When the team that owns the number also owns the commitment, the forecast starts drifting toward whatever number is comfortable to promise, and the organization loses its only unbiased read on the period.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like guidance vs forecast into prescriptive action for your team.
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