| Commercial rent |
Fixed |
Include $3,500 in monthly overhead from Month 1 through Month 60. |
Tying rent to sales volume. |
| Store manager salary |
Fixed |
Spread the $55,000 annual salary monthly as core payroll. |
Excluding payroll from break-even. |
| Personal stylist |
Semi-fixed |
Model $40,000 per full-time role, stepping up as FTE rises. |
Treating stylist payroll as per-order expense. |
| Retail associate |
Semi-variable |
Model $28,000 annual salary at 0.5 FTE in the first year, then flex coverage as traffic grows. |
Ignoring weekend staffing needs. |
| Wholesale inventory |
Variable |
Apply 15.0% of sales in the first year, falling to 13.0% by Year 5. |
Confusing initial stock with monthly COGS. |
| Inbound shipping |
Variable |
Apply 1.0% of sales in the first year with inventory purchases. |
Burying freight in overhead. |
| Sales commissions |
Variable |
Apply 1.0% of sales across all five years. |
Forgetting commissions when sales scale. |
| Payment processing fees |
Variable |
Apply 0.8% of sales in the first two years, then 0.7% from Year 3 onward. |
Modeling card fees as a flat bill. |