| Recurring monthly overhead |
Fixed |
Model $7,050 per month from rent, utilities, admin software, insurance, fees, hosting, training, and supplies. |
Spreading overhead per client too early and hiding the Month 17 break-even load. |
| Operating payroll roles |
Semi-fixed |
Step staffing by year, starting at $470,000 in annual first-year wages before higher staffed years. |
Treating labor as variable when most roles must be paid before clients fully ramp. |
| Third-Party Monitoring Software Licenses |
Variable |
Apply as 7.0% of revenue in the first year, declining to 5.0% by the mature year. |
Booking all software as fixed when this item is modeled as revenue-linked delivery spend. |
| Premium Content Syndication & Distribution |
Variable |
Apply as 4.0% of revenue in the first year, falling to 3.0% by the mature year. |
Ignoring distribution usage and overstating gross margin on higher service packages. |
| Sales Commissions |
Variable |
Apply as 5.0% of revenue in the first year, then reduce to 4.0% in the mature year. |
Putting commissions in fixed payroll and missing the true contribution margin. |
| Digital Advertising Spend (Performance Based) |
Variable |
Apply as 8.0% of revenue in the first year, declining to 6.0% by the mature year. |
Mixing performance ads with fixed brand spend and overstating break-even precision. |
| Payment Processing Fees |
Variable |
Apply as 2.0% of revenue in the first year, improving to 1.5% by the mature year. |
Leaving card fees out because each charge looks small. |
| Planned marketing budget tied to CAC |
Semi-variable |
Use the $120,000 first-year budget with $1,500 CAC, then scale with planned growth and CAC improvement. |
Treating all marketing as fixed even though acquisition volume changes the spend curve. |