| Office Rent and Utilities |
Fixed |
Include $6,500 per month in fixed overhead from Month 1 through Month 60. |
Treating rent as usage-based when it does not move with subscriptions. |
| Internal Software Subscriptions |
Fixed |
Include $2,200 per month as baseline operating overhead. |
Ignoring tool creep as teams add seats and apps. |
| Legal and Compliance Fees |
Fixed |
Include $3,000 per month to cover recurring legal, privacy, and compliance work. |
Excluding security review needs from the monthly break-even load. |
| Recruitment and Training |
Semi-fixed |
Include $1,500 per month, but review it when hiring steps up. |
Spreading hiring spikes too evenly across the model. |
| Cloud Hosting and Infrastructure |
Variable |
Use 8% of first-year revenue, then apply the forecasted percentage by year. |
Treating hosting as fixed too early in the scale-up. |
| Customer Support and Success Tools |
Variable |
Use 4% of first-year revenue because support load rises with active customers. |
Missing ticket-load growth as paid accounts increase. |
| Payment Processing Fees |
Variable |
Use 3% of revenue in the first operating year. |
Netting fees against sales instead of showing them as variable expense. |
| Engineering and AI Payroll |
Semi-fixed |
Model by role and full-time equivalent steps, including the $135,000 Lead Software Engineer salary and $120,000 Data Scientist AI Model salary from Month 13. |
Hiring before revenue supports the salary step-up. |