| Clinic Lease Payment |
Fixed |
Include $25,000 per month in fixed overhead from Month 1 through Month 60. |
Dividing rent by expected treatments and treating it like it falls when visits dip. |
| Utilities |
Semi-variable |
Use the modeled $3,500 per month as the base, then add usage only if the model adds a treatment or chair-hour driver. |
Putting the full utility bill into variable expense without a usage formula. |
| Insurance Premiums |
Fixed |
Include $2,000 per month in fixed overhead because the model runs it consistently from Month 1 to Month 60. |
Scaling insurance with revenue even though the assumption is a flat monthly premium. |
| Dental Supplies |
Variable |
Apply the revenue percentage, starting at 7.0% in the first year and falling to 6.0% by the fifth year. |
Budgeting supplies as a flat monthly amount and hiding margin pressure from treatment mix. |
| Marketing & Patient Acquisition |
Variable |
Apply the revenue percentage, starting at 9.0% in the first year and falling to 5.0% by the fifth year. |
Treating acquisition spend as fixed even though the model links it to revenue growth. |
| Payment Processing Fees |
Variable |
Apply the revenue percentage, starting at 2.5% in the first year and declining to 2.2% by the fifth year. |
Leaving card and payment fees out of contribution margin. |
| Provider and admin payroll |
Semi-fixed |
Treat salaried FTEs as overhead within each staffing step; Year 1 positions start in Month 1 and expand by planned FTE counts. |
Treating provider payroll as purely Variable when the Year 1 plan carries salaried FTEs from Month 1. |
| Professional Services |
Semi-fixed |
Use $1,000 per month as the current service tier and step it up only when operating scale requires more support. |
Scaling the full amount with revenue instead of modeling it as a capacity step. |