Quick Answer
A budget is a fixed financial plan approved for a specific period, typically one year, that sets spending targets and revenue goals. A forecast is a dynamic projection updated regularly with actual results and revised assumptions. Budgets represent what you planned to do; forecasts represent what you now expect will happen based on current information.
Understanding the distinction between a budget and a forecast is fundamental to good financial planning. They serve different purposes and are used at different points in the planning cycle.
A budget is a detailed financial plan for a defined period, usually one fiscal year. It is built through a structured process, approved by the board, and then locked as the baseline against which actual performance is measured. Budgets set targets for revenue, costs, headcount, and capital expenditure.
Key characteristics of a budget: - Set once per year (or planning cycle) - Approved by leadership or the board - Used as the baseline for variance analysis - Represents committed targets and spending authority
A forecast is a projection of expected financial results based on current knowledge. Unlike a budget, a forecast is updated regularly — monthly or quarterly — incorporating actual results and revised assumptions. It answers the question: "Given what we now know, where do we expect to end up?"
Key characteristics of a forecast: - Updated regularly (monthly or quarterly) - Incorporates actuals and revised assumptions - Used for operational decision-making - Represents the current best estimate of outcomes
Best practice is to maintain both simultaneously. The budget provides the accountability baseline — "this is what we committed to." The forecast provides the reality check — "this is where we think we'll land." The variance between them shows how well original assumptions held and where course corrections are needed.
You budget £2M in Q3 revenue based on pipeline assumptions in October. By July, your forecast shows £1.7M because two large deals slipped to Q4. The £300K variance flags a problem early, giving you time to adjust spending or accelerate other pipeline.
UK finance teams typically prepare an annual budget in Q4 for the following fiscal year, then reforecast quarterly. PE-backed companies often reforecast monthly for tighter performance tracking.
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FAQ
You can, but it is not recommended. A budget without regular reforecasting becomes stale quickly. You lose visibility into where the business is actually heading, and variance analysis at year-end provides hindsight rather than foresight.
Some companies are moving to "forecast-only" approaches using rolling forecasts. However, most still maintain an annual budget as a commitment baseline for board governance and compensation targets, alongside regular forecasts for operational planning.
Use a three-column view: Budget | Forecast | Actual. Calculate variances between each pair. Budget vs Actual shows how you performed against plan. Forecast vs Actual shows your prediction accuracy. Budget vs Forecast shows how expectations have shifted.
For day-to-day decision-making, the forecast is more important because it reflects current reality. For governance, accountability, and compensation, the budget is more important because it represents the committed plan against which performance is measured.
Grove FP lets you maintain multiple scenarios — your approved budget, current forecast, and rolling forecast — in a single model. Compare any two side by side with automatic variance calculations on every line item.
Grove FP gives UK finance teams a modern platform for budgeting, forecasting, and reporting — so you can focus on the decisions that matter.
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