A budget is a structured financial plan that sets out expected performance over a defined period. It translates strategy into numbers and provides a framework for managing revenue, costs, resources, assets, liabilities, and cash flow.
At its best, budgeting is not a constraint, it is a tool for control, clarity, and informed decision-making. The challenge for many businesses is not whether to budget, but how to budget in a way that is proportionate, useful, and aligned with how the business is actually run.
Choosing the Right Budgeting Approach
There is no single budgeting method that suits every organisation. Budgeting practices are shaped by management style, organisational maturity, sector, and growth ambitions. While approaches vary, the underlying principle remains the same: budgets must support planning, not replace it.
In recent years, alternative budgeting models such as “better budgeting”, “advanced budgeting”, and “beyond budgeting” have been explored. While these can offer flexibility in certain environments, most businesses continue to rely on a small number of proven methods—adapted to suit their needs.
The three most commonly used budgeting approaches in practice are:
Each has advantages and limitations.
Rolling Budgets
A rolling budget is continuously updated so that a fixed planning horizon—typically 12 months—is always maintained. As each month or quarter completes, a new future period is added.
This approach ensures that the business is always planning ahead, rather than working to an outdated annual budget.
Benefits of a Rolling Budget
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Keeps forecasts current and relevant
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Supports proactive decision-making
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Allows assumptions to be updated regularly
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Aligns well with fast-moving or growing businesses
Considerations
Rolling budgets require more frequent review and management attention. To remain effective, they should be kept lean, with clear ownership and limited unnecessary complexity. Involving too many people too often can dilute focus and increase time costs.
Example
A business sets a 12-month rolling budget from January to December. When January closes, the budget is extended by adding the following January. The planning horizon remains constant, but assumptions are refreshed as conditions change.
Last Year Plus Percentage Budgeting
This approach builds the budget by taking the previous year’s results and applying an uplift or reduction—often expressed as a percentage—to key lines such as revenue and costs.
It is widely used by established or seasonal businesses with stable trading patterns and reliable historic data.
Benefits
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Simple and quick to produce
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Easy to understand and communicate
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Suitable where performance is consistent year to year
Limitations
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Risks embedding inefficiencies
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Can discourage challenge or innovation
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Less effective where the business model is changing
This method works best when combined with critical review rather than applied mechanically.
Bottom-Up Budgeting
Bottom-up budgeting builds the budget from the operational level upward. Individual departments, teams, or cost centres prepare their own forecasts, which are then consolidated into an overall budget.
Benefits
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Encourages ownership and accountability
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Often produces more realistic assumptions
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Improves engagement across the organisation
Considerations
Bottom-up budgets can be time-consuming and may lead to conservative forecasting if not reviewed rigorously. Strong coordination and challenge are essential to ensure alignment with overall strategy.
Making Budgeting Work
A budget is only effective if it is used. The most successful businesses treat budgeting as a living process rather than a once-a-year exercise.
Effective budgeting should:
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Be aligned with strategic objectives
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Be reviewed regularly against actual performance
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Focus on material drivers, not unnecessary detail
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Support decision-making, not restrict it
How We Support Budgeting
We work with clients to design budgeting frameworks that suit their size, structure, and objectives. This may include selecting the appropriate budgeting method, building financial models, and integrating budgets with forecasting and KPI reporting.
The aim is simple: to provide a budget that is realistic, flexible, and genuinely useful, supporting control today and confidence in what comes next.
