| Warehouse and Office Lease |
Fixed |
Include $12,000/month in fixed overhead from Month 1 through Month 60. |
Allocating rent per repair job and hiding the monthly cash floor. |
| Insurance and Bonding |
Fixed |
Include $4,500/month in fixed overhead for the relevant planning range. |
Tying coverage to each job without support from the model. |
| Software Licenses and IT |
Fixed |
Include $3,200/month in fixed overhead before calculating contribution margin. |
Treating required systems as variable because more customers use them. |
| Planned Marketing |
Fixed |
Use $15,000/month in the first year, calculated as $180,000 annual budget divided by 12. |
Leaving customer acquisition spend out of the break-even base. |
| Replacement Parts and Components |
Variable |
Model as 18.0% of revenue in the first year, declining to 14.0% by the mature year. |
Ignoring parts inflation, supplier changes, or repair mix shifts. |
| Sales Commissions and Travel |
Variable |
Model as 8.0% of revenue in the first year, declining to 6.0% by the mature year. |
Holding travel flat while sales volume and service coverage expand. |
| Technician Wages |
Semi-fixed |
Add labor in FTE steps: senior biomedical technicians rise from 2.0 to 6.0 FTE, and field service technicians rise from 3.0 to 12.0 FTE. |
Treating all technician pay as per-job variable labor. |
| Utilities and Communications |
Semi-variable |
Start with the $1,200/month base, then test usage as calls, dispatches, and office activity grow. |
Locking the full bill as fixed and missing usage creep. |