| Office Rent |
Fixed |
Use $2,500 per month in fixed overhead from Month 1 through Month 60. |
Spreading rent across students and making the unit margin look too low. |
| Software Licenses |
Fixed |
Use $800 per month as baseline operating overhead for the planning range. |
Counting software as a per-student charge when the model treats it as monthly overhead. |
| Professional Services |
Fixed |
Use $1,500 per month in fixed overhead before calculating required contribution margin. |
Leaving advisory, legal, or accounting support outside break-even math. |
| CEO/Founder, Lead Curriculum Developer, and Lead Software Engineer payroll |
Fixed |
Treat first-year payroll as fixed because each role is planned at 1.0 FTE from Month 1. |
Treating all curriculum labor as variable instead of planned staff capacity. |
| Customer Support Specialist payroll |
Semi-fixed |
Add this payroll after Month 13 as a capacity step, not as a per-student expense. |
Adding support headcount too early or tying it to every new paid family. |
| Operations & Logistics Coordinator payroll |
Semi-fixed |
Add this role after Month 25 as kit volume and fulfillment work justify the step-up. |
Forgetting the staffing step when physical kit demand grows. |
| Physical Kit Production |
Variable |
Apply as a revenue-linked delivery expense: 7.0% in the first year and 6.0% in Year 3. |
Counting initial kit inventory as monthly operating expense. |
| Digital Marketing Spend |
Variable |
Apply as a sales-linked expense: 6.0% in the first year and 5.0% in Year 3. |
Hiding paid acquisition inside fixed overhead and overstating contribution margin. |