| General Office Rent |
Fixed |
Include $4,500/month in fixed overhead from Month 1 through Month 60. |
Tying rent to subscriber count instead of treating it as baseline overhead. |
| Year 1 Payroll |
Fixed |
Use $485K/year, or about $40.4K/month, for the planned first-year team. |
Letting payroll move with users before the staffing plan actually changes. |
| Annual Marketing Budget |
Semi-fixed |
Model $120K/year, or $10K/month, as planned spend that steps up with growth plans. |
Spreading marketing as a pure percentage of revenue and hiding spend limits. |
| Customer Acquisition Cost (CAC) |
Variable |
Use $2 per acquired customer in the first operating year for acquisition volume testing. |
Counting CAC on top of the same marketing budget without checking for double spend. |
| HIPAA Compliant Cloud Hosting and Storage |
Variable |
Subtract 8% of first-year revenue in contribution margin before fixed overhead. |
Treating hosting as fixed and overstating margin as user activity grows. |
| Pharmaceutical Data Licensing Fees |
Variable |
Subtract 5% of revenue as a revenue-linked vendor fee in the break-even model. |
Leaving data fees below EBITDA instead of reducing contribution margin. |
| App Store Transaction Fees |
Variable |
Apply 5% of revenue to paid subscriptions processed through app stores. |
Using gross subscription revenue and missing store fee leakage. |
| Customer Support Outsourcing |
Semi-variable |
Model 4% of revenue in the first year, then review ticket volume as paid users grow. |
Holding support flat while medication reminders, billing issues, and caregiver questions rise. |