| Founder, operations, sales, and admin payroll |
Semi-fixed |
Carry as monthly salary burn and change only when planned full-time equivalent headcount changes. |
Treating office payroll as a percent of revenue. |
| Senior IT Engineer, Helpdesk Technician, and Cybersecurity Analyst payroll |
Semi-fixed |
Model as capacity added in hiring blocks, not as dollars that move with each support ticket. |
Treating delivery payroll as fully variable when salaries create monthly burn. |
| Software Licensing (RMM, PSA, Security Tools) |
Variable |
Apply 10% of revenue in the first year, then use the planned lower percentages by year. |
Locking tool spend as one flat monthly amount despite customer growth. |
| Cloud Infrastructure Costs (Client/Internal) |
Variable |
Apply 6% of revenue in the first year to reflect client and internal usage tied to sales volume. |
Understating usage as new managed service customers come on. |
| Third-Party Vendor Support (Specialized Security) |
Variable |
Apply 3% of revenue in the first year for specialized support tied to service delivery. |
Burying vendor support in overhead and overstating gross margin. |
| Sales Commissions & Bonuses |
Variable |
Apply 5% of revenue in the first year because commissions rise with closed sales. |
Mixing commissions with fixed sales payroll. |
| Office Rent |
Fixed |
Use $4,500 per month across the planning range unless the office footprint changes. |
Scaling rent with revenue before a real lease change occurs. |
| Utilities & Internet |
Semi-variable |
Start with the $800 monthly baseline and flex only when office usage or connectivity needs rise. |
Treating the whole amount as fixed even when scale can add usage charges. |