| Office rent |
Fixed |
Use $8,000 per month as fixed overhead from Month 1 through Month 60. |
Spreading rent across projects and hiding the true monthly break-even hurdle. |
| Legal and accounting services |
Fixed |
Include $2,500 per month in the fixed overhead base before contribution margin. |
Treating recurring advisory fees like one-time setup spend. |
| Cloud computing services |
Variable |
Apply 8% of revenue in the first year, falling to 6% by the mature year. |
Classifying cloud as fixed even when usage rises with project volume. |
| AI development software licenses |
Variable |
Model as 4% of revenue in the first year, improving to 3% by the mature year. |
Locking licenses into overhead instead of tying them to delivery volume. |
| Sales and marketing spend |
Variable |
Use 12% of revenue in the first year, stepping down to 8% by the mature year. |
Using only the annual budget and ignoring revenue-based acquisition load. |
| Project data and labeling |
Variable |
Apply 3% of revenue in the first year, declining to 2% by the mature year. |
Treating labeling as fixed when client projects drive the workload. |
| Senior AI engineers and AI engineers |
Semi-fixed |
Add salaries in hiring blocks as capacity expands from 2 technical FTEs in the first year to 8 by the mature year. |
Assuming payroll moves smoothly with revenue instead of in hiring steps. |
| Project managers |
Semi-fixed |
Add capacity when the role starts in Month 13, then scale from 1 FTE to 2 FTEs by the mature year. |
Adding project management too late, which can cap billable delivery before revenue catches up. |