This lesson examines the various methodologies used to construct budgets. It covers the key differences between approaches such as incremental budgeting, zero-based budgeting, activity-based budgeting, and rolling forecasts, providing students with a comprehensive toolkit.

• Incremental Budgeting: This traditional approach starts with the previous period’s budget or actual performance as a base and adjusts for expected changes (e.g., inflation, growth). While simple and stable, it often perpetuates inefficiencies by assuming that historical spending was justified. It can lead to “zombie costs” that continue without justification . It also tends to reward spending, as managers may feel they must use their full budget to avoid cuts in the next period.

• Zero-Based Budgeting (ZBB): In contrast, ZBB requires managers to justify every expense from a “zero base” for each new budget period. All activities must be justified, and allocations are based on the value they add to the organisation. ZBB is effective at identifying and eliminating obsolete or non-value-adding activities . It is a powerful tool for cost management and strategic alignment but can be time-consuming and resource-intensive to implement .

• Activity-Based Budgeting (ABB): This approach builds the budget around the activities needed to achieve production and sales targets. It uses the cost drivers identified in Activity-Based Costing (ABC) to determine the resources required for each activity . ABB focuses on eliminating non-value-adding activities, improving production processes, and providing information for pricing and profitability analysis . It offers more accuracy than traditional methods for businesses with high overhead costs.

• Continuous (Rolling) Budgets: Rolling budgets are updated periodically (e.g., monthly or quarterly) by adding a new period (e.g., a new month) as the current period ends. This ensures that the budget always covers a fixed future period (e.g., 12-18 months) and reflects the latest business conditions. They promote agility and are often used alongside forecasting, making them valuable in volatile environments .

• Kaizen Budgeting: This approach incorporates continuous improvement targets into the budgeting process. It sets cost reduction goals for each period and assumes that costs should continually decrease through process improvements . This is often used in lean manufacturing environments where the focus is on eliminating waste and improving efficiency incrementally over time .

• Project Budgeting: This methodology involves creating a separate budget for specific, finite projects (e.g., developing a new product, building a new factory). It is used to plan and control the financial resources dedicated to a single initiative .