| Office Rent |
Fixed |
Include $3,000 per month in fixed overhead from Month 1 through Month 60. |
Spreading rent across rentals and making margin look lower than it is. |
| Utilities |
Fixed |
Include $500 per month in baseline overhead for break-even math. |
Assuming utilities rise with each booking instead of staying stable in the planning range. |
| Cloud Hosting Infrastructure |
Fixed |
Include $1,000 per month as platform overhead unless usage tiers are added later. |
Treating hosting as per-rental spend without a modeled usage driver. |
| Payroll |
Semi-fixed |
Use Year 1 wages of $390,000 annually, then step up as FTEs increase in later years. |
Modeling payroll as a percent of revenue instead of adding staff in capacity steps. |
| Insurance Premiums per Rental |
Variable |
Deduct 8.0% of order value in Year 1, falling to 6.0% by Year 5. |
Leaving insurance in overhead and overstating contribution margin per rental. |
| Roadside Assistance per Rental |
Variable |
Deduct 3.0% of order value in Year 1, falling to 2.0% by Year 5. |
Forgetting that each completed rental carries trip support exposure. |
| Digital Advertising Spend |
Variable |
Deduct 6.0% of revenue in Year 1, falling to 4.0% by Year 5. |
Counting only annual marketing budgets and missing revenue-linked acquisition pressure. |
| Payment Gateway Fees |
Variable |
Deduct 2.5% of revenue in Year 1, falling to 2.0% by Year 5. |
Treating payment fees as fixed software spend instead of booking-linked processing expense. |