Budget Variance
Definition
Budget variance is the difference between budgeted (planned) amounts and actual results for a given period, expressed in dollars or as a percentage. Analyzing variances helps companies identify areas where spending or revenue deviates from plan, enabling timely corrective action and more accurate future budgeting.
Formula
Overview
Budget variance compares what you planned to spend or earn against what actually happened. A favorable variance means actual results exceeded the budget (higher revenue or lower expenses), while an unfavorable variance means the opposite. Tracking variances by category and magnitude helps prioritize where to investigate.
For startups, budget variance analysis should be performed monthly. The most valuable insights come from understanding why variances occurred, not just that they exist. A favorable marketing variance because the team did not execute planned campaigns is very different from a favorable variance due to discovering a more efficient acquisition channel.
Persistent variances in the same direction suggest the budget needs recalibration. If actual engineering costs consistently exceed budget by 15 %, the budget is likely too low, not that engineering is overspending. Frequent variance analysis also improves forecasting accuracy over time by revealing which assumptions were wrong and why.
Example
Budgeted marketing spend of $20K versus actual of $24K creates an unfavorable variance of $4K (20 %). Investigation reveals an unplanned conference sponsorship that generated strong leads.
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