What is Zero-Based Budgeting?
Zero-based budgeting (ZBB) builds each budget from scratch rather than adjusting last year's numbers. Every expense must be justified based on current needs and expected returns, regardless of historical spending.
Traditional budgeting takes last year as a baseline. ZBB assumes a zero baseline and requires justification for every dollar.
Why ZBB Matters for Startups
Startups can't afford legacy spending that no longer delivers value. ZBB forces hard questions: Do we still need this tool? Is this hire essential? Could we get the same result cheaper?
ZBB is especially valuable when runway is tight or when preparing for a funding environment that requires efficiency.
Implementing ZBB
List all current expenses. For each, ask: what happens if we cut this? What value does it deliver? Is there a cheaper alternative? Prioritize ruthlessly. Some costs are essential; many are habit.
Formula
No formula. ZBB is a methodology where every expense must be justified from zero each period.
Compare: cost to continue vs benefit delivered
Example
Your SaaS company adopts ZBB vs traditional budgeting:
Traditional: Last year's marketing was $100K, increase 10% to $110K.
Zero-based: What marketing do we actually need? Justify every dollar.
- Content: $30K (drives 40% of leads)
- Paid ads: $50K (20% of leads, but fastest)
- Events: $15K (brand building)
Total: $95K, but better allocated.