What is the budget performance index?

Budget performance index (BPI) measures actual performance against budget as a ratio, typically calculated as actual results divided by budgeted amounts. For professional service firms, BPI provides a quick assessment of budget tracking across revenue, expenses, and profit. An index of 1.0 means on budget; an index above 1.0 indicates favorable variance in revenue, and one below 1.0 indicates unfavorable variance in expenses.

Key characteristics

• Actual divided by budget as a ratio

• An index of 1.0 means exactly on budget

• Applied to revenue, expenses, profit

• Enables quick performance assessment

• Comparable across different-sized items

• Should be tracked monthly

Why it matters for professional service firms

Budget variance in dollars can be hard to compare across items of different sizes. A $10K variance on a $50K item (20%) is more significant than $10K on a $500K item (2%). BPI normalizes comparison. Professional service firms should track BPI for major budget categories, focusing on items with significant index deviations from 1.0, regardless of absolute dollar variance.

Real-world example

Patricia's firm reviewed budget variances in dollars only. Large revenue items with small percentage variances got attention; small expense items with large percentage variances were ignored. Implementing BPI: revenue BPI 1.05 (5% favorable), direct costs BPI 1.08 (8% unfavorable), overhead BPI 0.95 (5% favorable), net margin BPI 0.92 (8% unfavorable). The normalized view showed that direct costs were the problem, despite a smaller dollar variance than the revenue variance. Investigation revealed contractor rate increases not reflected in pricing. BPI focused its attention correctly.