| Office rent and utilities |
Fixed |
Carry at $6,500 per month from Month 1 through Month 60. |
Spreading rent by customer and hiding the real monthly hurdle. |
| Professional services legal and accounting |
Fixed |
Include $2,000 per month as recurring overhead before break-even. |
Treating recurring compliance work like a one-time launch item. |
| First-year payroll |
Fixed |
Use $750,000 per year, or $62,500 per month, as baseline staffing overhead. |
Counting payroll only after revenue starts, which overstates early margins. |
| First-year marketing budget |
Fixed |
Use $120,000 per year, or $10,000 per month, if spend is committed monthly. |
Calling all marketing variable even when campaigns are prepaid or committed. |
| Cloud computing and AI API usage |
Variable |
Deduct 8.5% of first-year revenue before covering fixed overhead. |
Modeling usage as flat while feed volume and queries rise. |
| Third-party data licensing fees |
Variable |
Deduct 4.0% of first-year revenue as a revenue-linked content input. |
Treating licensing as fixed when contracts scale with source count, usage, or revenue. |
| Payment processing fees |
Variable |
Deduct 3.0% of first-year revenue from paid subscriptions and fees. |
Forgetting processing fees when paid conversion improves. |
| Senior full stack engineer staffing |
Semi-fixed |
Step capacity from 2.0 FTE in the first year to 6.0 FTE in the mature year. |
Assuming engineering grows smoothly instead of in hiring steps. |