| Commercial lease |
Fixed |
Use $3,500 per month as base overhead from Month 1 through Month 60. |
Scaling rent with sales instead of treating it as the monthly hurdle. |
| Utilities |
Fixed |
Use $400 per month in the fixed overhead stack for break-even. |
Over-modeling small usage swings when the assumption is a flat monthly amount. |
| Business insurance |
Fixed |
Use $150 per month as required overhead before any profit is earned. |
Leaving insurance below the line and understating break-even sales. |
| Point-of-sale subscription |
Fixed |
Use $80 per month as a recurring store operating charge. |
Treating the subscription like a per-order fee when the model shows a flat amount. |
| Wholesale inventory replenishment |
Variable |
Use 10.0% of sales in the first year, then lower it by year as modeled. |
Treating inventory buys as fixed overhead instead of sales-linked replenishment. |
| Workshop and reading partner payouts |
Variable |
Use 4.0% of sales in the first year, tied to service revenue activity. |
Counting payouts as payroll and hiding the true contribution margin. |
| Marketing and promotion |
Variable |
Use 4.0% of sales in the first year for demand-building spend. |
Locking marketing as a flat budget while sales volume changes. |
| Part-time retail associate staffing |
Semi-fixed |
Model staffing as a step up when FTE rises from 0.5 in the first year to 1.0 in the second year. |
Smoothing payroll evenly and missing the break-even impact of staffing jumps. |