| Office Rent |
Fixed |
Include the $5,000 monthly amount in baseline overhead from Month 1 through Month 60. |
Tying rent to client volume instead of treating it as a monthly hurdle. |
| Utilities |
Fixed |
Include the $800 monthly amount in fixed overhead for the relevant planning range. |
Modeling small office usage swings as if they rise with revenue. |
| Internal Software & CRM Licenses |
Fixed |
Include the $2,000 monthly platform spend in overhead before calculating contribution margin. |
Confusing internal tools with client-specific licenses used on projects. |
| Subcontractor Fees for Specialized Skills |
Variable |
Apply 8% of revenue in the first year, stepping down to 6% by the mature year. |
Budgeting subcontractors as fixed staff even though scope drives the spend. |
| Client-Specific Software Licenses |
Variable |
Apply 4% of revenue in the first year, declining to 3% by the mature year. |
Placing project licenses in overhead and overstating gross margin. |
| Sales Commissions & Bonuses |
Variable |
Apply 7% of revenue in the first year, declining to 5% by the mature year. |
Forgetting commissions when testing how many client hours cover overhead. |
| Consultant Delivery Payroll |
Semi-fixed |
Add salaries in hiring steps as capacity expands, not per individual client hour. |
Treating full-time consultants as variable labor that disappears when sales dip. |
| Annual Marketing Budget |
Semi-variable |
Convert the annual budget to a monthly plan and adjust when pipeline goals change. |
Locking spend as fixed while also assuming Customer Acquisition Cost improves. |