Management Accounting 101: Budgeting and Forecasting - Zero-Based Budgeting, ZBB vs. Incremental Budgeting

What This Is

Zero-Based Budgeting (ZBB) and Incremental Budgeting are two fundamental budgeting approaches used by managers to allocate resources. ZBB is a more comprehensive and flexible approach that starts from a "zero base," where every expense is justified and approved, whereas Incremental Budgeting builds on the previous year's budget, making only minor adjustments. Toyota, a renowned manufacturer, uses ZBB to allocate resources effectively, ensuring that every expense is justified and aligned with its strategic objectives.

Key Frameworks & Metrics

• Zero-Based Budgeting (ZBB): A budgeting approach that starts from a "zero base," where every expense is justified and approved.
• Incremental Budgeting: A budgeting approach that builds on the previous year's budget, making only minor adjustments.
• Break-Even Point (units) = Fixed Costs / Contribution Margin per Unit: Tells you how many units must be sold to cover all costs.
• Economic Value Added (EVA®) = NOPAT? (Capital Invested × WACC): Measures true economic profit after charging for the cost of capital.
• Contribution Margin = Sales - Variable Costs: Represents the amount of money available to cover fixed costs and generate profit.
• Residual Income = Net Income - (Capital Invested × WACC): Measures the return on investment after charging for the cost of capital.
• Return on Investment (ROI) = Net Income / Total Assets: Measures the return on investment as a percentage.
• Activity-Based Costing (ABC): A costing approach that assigns costs to products or services based on their activities.
• Balanced Scorecard (BSC): A strategic management framework that measures performance from four perspectives: financial, customer, internal processes, and learning and growth.

Step-by-Step Process

1. Identify the budgeting approach: Determine whether to use ZBB or Incremental Budgeting based on the organization's needs and goals.
2. Establish a zero base: Start from a "zero base" and justify every expense in ZBB.
3. Gather data: Collect data on actual costs, revenues, and expenses for the previous period in Incremental Budgeting.
4. Analyze data: Analyze the data to identify areas for improvement and opportunities for cost reduction in both approaches.
5. Develop a budget: Create a budget that allocates resources effectively and aligns with the organization's strategic objectives.
6. Monitor and adjust: Continuously monitor and adjust the budget to ensure it remains relevant and effective.

Common Mistakes

• Mistake: Treating all costs as relevant in ZBB.
• Correction: Only consider avoidable costs in ZBB, as they are the ones that can be reduced or eliminated.
• Mistake: Ignoring qualitative factors in make-or-buy decisions.
• Correction: Consider both quantitative and qualitative factors, such as strategic alignment and risk, in make-or-buy decisions.
• Mistake: Using ROI alone without considering residual income or EVA.
• Correction: Use a combination of ROI, residual income, and EVA to evaluate investment opportunities and make informed decisions.

Decision-Making Tips

• When faced with a make-or-buy decision, always isolate avoidable costs and consider strategic, not just quantitative, factors.
• When evaluating investment opportunities, use a combination of ROI, residual income, and EVA to ensure a comprehensive evaluation.
• When implementing ZBB, ensure that every expense is justified and approved to avoid unnecessary costs.

Quick Practice Scenario

A division rejects a project because its ROI would drop from 18% to 17%. By how much would residual income change if the project cost is $1M and the required rate of return is 12%?

Answer: Residual income would decrease by $50,000 (=$1M x 12% - $1M x 17%). Explanation: Residual income decreases because the project's return on investment (ROI) drops, resulting in a lower return on investment.

Last-Minute Cram Sheet

• Zero-Based Budgeting (ZBB): A budgeting approach that starts from a "zero base," where every expense is justified and approved.
• Incremental Budgeting: A budgeting approach that builds on the previous year's budget, making only minor adjustments.
• Break-Even Point (units) = Fixed Costs / Contribution Margin per Unit: Tells you how many units must be sold to cover all costs.
• Economic Value Added (EVA®) = NOPAT? (Capital Invested × WACC): Measures true economic profit after charging for the cost of capital.
• Contribution Margin = Sales - Variable Costs: Represents the amount of money available to cover fixed costs and generate profit.
• Residual Income = Net Income - (Capital Invested × WACC): Measures the return on investment after charging for the cost of capital.
• Return on Investment (ROI) = Net Income / Total Assets: Measures the return on investment as a percentage.
• Activity-Based Costing (ABC): A costing approach that assigns costs to products or services based on their activities.
• Balanced Scorecard (BSC): A strategic management framework that measures performance from four perspectives: financial, customer, internal processes, and learning and growth.
• 'Fixed costs' are only fixed in the short run within a relevant range – outside that range, they can change.
• ZBB is more comprehensive and flexible than Incremental Budgeting, but requires more resources and effort.