Rolling Budget

A rolling budget is a budget that is continuously updated by adding a new period at the end as the most recent period is completed. A company with a 12-month rolling budget, for example, adds a new month every time a month ends, so the budget always covers the next 12 months. It is also known as a continuous budget or a perpetual budget, and when it is used mainly for forecasting rather than setting targets it is often called a rolling forecast. It is also called a continuous budget.

Rolling budgets are an alternative to the traditional annual budget, which is prepared once a year for a fixed financial year and gradually shortens as the year passes. By November, a traditional budget covers only two months ahead, while a rolling budget still looks a full year forward. The approach is used in managerial accounting and corporate planning, especially in fast-changing industries.

• The business chooses a planning horizon, commonly 12 or 18 months, and an update interval, usually monthly or quarterly.
• At the end of each interval, actual results for the period just finished are compared with the budget, and the period drops off the plan.
• A new period is added at the far end, built from the latest assumptions about sales, costs, prices and capacity.
• Estimates for the periods in between are revised where conditions have changed, though some firms lock the nearest quarter to keep targets stable.
• The revised plan feeds the cash forecast, staffing plans and purchasing decisions.

A software company uses a 12-month rolling budget updated quarterly. In January 2026 its budget covers January to December 2026, with revenue of $3.0 million per quarter. At the end of March, actual first-quarter revenue is $3.3 million, and a large customer has signed a contract starting in the summer. The finance team drops January to March 2026, raises the forecasts for the second to fourth quarters to $3.4 million, $3.6 million and $3.6 million, and adds January to March 2027 at $3.8 million. The budget now covers April 2026 to March 2027 and reflects what the company knows today.

Comparing the first quarter's $3.3 million with the original $3.0 million budget gives a $300,000 favorable variance. Under a traditional annual budget, the remaining quarters would still be judged against the outdated $3.0 million figures, making later budget variances less meaningful.

• Plans stay relevant because they reflect current market conditions, prices and strategy.
• Managers always have a full year of visibility, which supports hiring, purchasing and cash forecasting.
• Budgeting becomes a regular habit rather than a once-a-year exercise, spreading the workload.
• It can reduce budgetary slack and year-end spending sprees, since there is no single annual budget to protect.

Rolling budgets take more time and staff effort, because forecasts are revised every month or quarter. Frequent changes can confuse targets and bonus schemes: if the budget moves every quarter, managers may not know what they are being measured against. For this reason many organizations keep a fixed annual budget for performance evaluation and use a rolling forecast for planning. Rolling budgets also depend on good systems; spreadsheets become hard to manage, so businesses often use planning software linked to their enterprise resource planning system.

A rolling budget can be combined with other techniques. It may be built as a flexible budget that adjusts for activity levels, or use zero-based reviews for selected cost areas. It is often contrasted with a static budget, which is fixed at one level of activity and is not updated during the year, and with the government budget process, which is normally tied to a fixed fiscal year set by law.