Rolling forecasts vs annual budgets

A rolling forecast is updated at regular intervals, usually monthly or quarterly, and each time a period ends a new one is added, so the plan always looks the same distance ahead. An annual budget is set once and fixed for the year. Rolling forecasts are worth the extra work where conditions change faster than a yearly cycle can follow; in a stable business a fixed budget with periodic reforecasts is often enough.

What is a rolling forecast?

ACCA’s series on budgeting describes the rolling budget approach as one where the budget is updated more frequently than annually, either quarterly or monthly, and a new budget period is added to replace the period that has just expired. The budget therefore always extends one year into the future and is continuously updated.

In practice two versions are seen. A rolling budget replaces the annual budget altogether: the latest version becomes the plan that managers are measured against. A rolling forecast keeps targets separate and is simply the business’s current best estimate of the next twelve months or so, used for cash planning, hiring and funding decisions. Many smaller businesses start with a rolling forecast alongside their existing annual budget and only later decide whether the budget is still needed.

How does it differ from an annual budget?

Feature	Annual budget	Rolling forecast
When prepared	Once, before the year starts	Every month or quarter
Horizon	Shrinks as the year passes, to one month in the final month	Stays constant, often 12 to 18 months
Assumptions	Fixed when the budget is agreed	Revised at each update
Main use	Target setting and control	Planning, cash and resource decisions
Effort	One large exercise a year	Smaller, regular exercises

ACCA explains the case against relying on the annual budget alone: once approved it is usually set in stone, which suits a stable, mature industry, but in volatile conditions competitors can launch new products, demand can shift and costs can fluctuate, making the annual budget obsolete well before the year ends.

How do you set one up?

1. Choose the horizon and the step. A twelve month horizon updated quarterly is a common starting point. Monthly updates suit businesses with tight cash or fast moving sales.
2. Build on drivers, not last year’s lines. Forecast the few things that move the numbers, such as orders, chargeable hours, headcount, prices and payment terms, and let the rest follow. ACCA’s article on forecasting with data lists the factors a sales forecast needs to consider, including economic and industry conditions, product life cycles, pricing and customer terms, marketing and new legislation.
3. Load actual results first. Each update begins with the latest management accounts, then revises the remaining periods and adds the new one at the end.
4. Use simple statistical help where it fits. ACCA’s forecasting article recaps regression and time series analysis, and warns that time series forecasts assume the past is a good guide to the future.
5. Link profit to cash. Extend the forecast into a cash flow forecast on the same assumptions so that VAT, PAYE, Corporation Tax and loan repayments appear in the months they are paid.
6. Fix a timetable. Agree who updates what and by which working day, so the forecast is ready in time for the decisions it supports.

What does a rolling update look like?

Illustration only. A software reseller forecasts four quarters ahead. In January it holds a forecast for Q1 to Q4 of the current year, with Q1 revenue of £300,000. When Q1 closes, actual revenue was £270,000 because two large deals slipped into Q2.

Step	What happens
Record actuals	Q1 actual of £270,000 replaces the forecast
Revise remaining quarters	Q2 rises by £30,000 for the slipped deals; Q3 and Q4 are reviewed for the same price pressure
Add a new period	Q1 of next year is added, so the forecast again runs four quarters ahead
Recheck cash	Later receipts push the lowest bank balance from May into June

ACCA’s own worked example follows the same pattern: a display screen manufacturer with an annual incremental budget on a standalone spreadsheet moves to a rolling budget after Q1 prices fall, wage costs rise and a new salaried role is added from Q2, and each of those changes is carried into the next four quarters.

When should a rolling forecast replace the annual budget?

ACCA describes rolling budgets as particularly useful in unpredictable and volatile industries where it is difficult to plan one year ahead, because managers revise their assumptions more often. Signs that the annual budget is no longer doing its job include budgets that are out of date by the second quarter, managers ignoring variances because the original assumptions are plainly wrong, and decisions on staff or stock being made from a separate, informal forecast anyway.

The step beyond that is the Beyond Budgeting approach, which ACCA describes as moving away from the fixed annual budget as the primary control tool. Its proponents argue that fixed annual targets go out of date, reward the wrong people and produce lagging indicators; under Beyond Budgeting, rewards go to teams based on relative performance against peers rather than fixed targets. A rolling forecast is often the planning tool used in place of the budget in that model.

An annual budget still has a place where the business is stable, where lenders or a parent company require one, or where there is no capacity to update forecasts properly. In those cases a quarterly reforecast against the fixed budget, with variances explained through variance analysis, gives much of the benefit for less effort.

What problems does a rolling approach bring?

ACCA lists several drawbacks. Rolling budgets require more work, and managers may need training that is expensive and time consuming. Conflict can arise over performance targets, with managers complaining of changing goal posts. Managers may spend too much time preparing budgets and not enough controlling the business. New software may be needed, and if the rolling budget sits on a standalone spreadsheet not linked to the accounting system, data integrity problems can follow.

The goal post problem is usually solved by separating the two jobs. Keep a forecast that is honest about where the business is going, and set targets on a different basis, such as a fixed annual target, a stretch figure agreed at the start of each quarter, or relative measures.

How do rolling forecasts help with going concern and lenders?

FRC Factsheet 13 on going concern for small companies and micro entities explains that FRS 102 requires directors to consider a period of at least, but not limited to, twelve months from the date the financial statements are authorised for issue (paragraph 2.17), and that FRS 105 sets the same minimum. Paragraph 3.10 says directors could prepare a budget, trading estimate, cash flow forecast or equivalent analysis covering that period, and review previous forecasts against actual results. Because accounts are often approved several months after the year end, a forecast that always looks twelve to eighteen months ahead is already close to the period the assessment needs; see going concern assessment.

Paragraph 3.12 adds that forecast assumptions must be reasonable and supportable, and that directors should be aware of their own potential bias. Paragraph 3.25 suggests a simple sensitivity analysis, changing the most critical assumption such as the growth rate, for an uncomplicated assessment. A rolling forecast with a record of how past versions compared with actual results is good evidence for both.

What mistakes come up most often?

• Rolling the forecast forward without first loading actual results, so errors compound.
• Forecasting every ledger line in detail each month, which makes the process too slow to keep up.
• Using the forecast as the target, so that every miss quietly lowers the bar.
• Updating profit but not cash, missing tax and loan payment dates.
• Never comparing old forecasts with what happened, so systematic optimism goes unnoticed.
• Moving to rolling forecasts while budgeting costs from habit; some businesses pair the change with a periodic zero based review of discretionary spend.

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Related Accountapedia entries

• Driver based forecasting
• Financial projections for a business plan
• Fixed, variable and semi variable costs
• Flexed budgets explained
• The three way forecast

Sources

• ACCA: www.accaglobal.com
• ACCA: Forecasting data
• ACCA: www.accaglobal.com
• Financial Reporting Council: FRS Factsheet 13 The Going Concern Basis of Accounting for Small Compa

Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 8 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.