Zero-based budgeting

Zero-based budgeting builds each period's budget from nothing rather than from last year's numbers. Managers begin at zero and must justify every proposed expenditure on its own merits, explaining what the spending accomplishes and what would happen without it. Nothing carries forward automatically simply because it was funded before.

The process typically works through decision packages. Each activity is described as a package showing its purpose, cost, benefits, and alternative levels of funding — often a minimum viable level plus incremental levels. Management then ranks the packages across the organization and funds them in priority order until the available resources are exhausted. A department that spent $500,000 last year might receive $400,000 or $700,000 this year depending purely on how its packages rank, not on its prior allocation.

The advantages are that zero-based budgeting exposes obsolete spending, forces managers to link cost to output, and allocates resources to current priorities rather than historical ones. The drawbacks are cost and effort: the analysis is time-consuming, it can favor managers who write persuasive justifications over those who don't, and it may bias against long-term programs whose benefits are hard to quantify in a single period. Many organizations apply it selectively — to discretionary and support functions, or on a rotating cycle — rather than to every cost center every year.

Zero-based budgeting is tested in the planning, budgeting, and forecasting section of CMA Part 1, usually alongside the other budgeting methodologies. Be ready to compare it with incremental budgeting, activity-based budgeting, and continuous (rolling) budgets, and to identify situations where each approach is most appropriate.