| T-shirt direct inputs |
Variable |
Apply $8.25 per unit: $5.00 blank, $1.00 ink, $1.50 print labor, $0.25 setup, and $0.50 packaging. |
Blending these into monthly overhead and overstating contribution margin. |
| Hoodie direct inputs |
Variable |
Apply $18.00 per hoodie sold across blank apparel, ink, print labor, setup, and packaging. |
Using the lower T-shirt input rate for higher-cost hoodie orders. |
| Product production overhead |
Variable |
Apply 0.6% of revenue for each active apparel line for overhead, indirect materials, maintenance, production utilities, and quality assurance. |
Ignoring small percentage loads because each line item looks minor. |
| Shipping & fulfillment fees |
Variable |
Use 3.0% of first-year revenue, then the scheduled rate decline in later model years. |
Treating fulfillment as a flat monthly bill when it moves with shipped orders. |
| E-commerce transaction fees |
Variable |
Use 1.5% of first-year revenue, then the scheduled rate decline in later model years. |
Leaving fees below the gross margin line and overstating order profit. |
| Shop overhead bundle |
Fixed |
Include $5,100 per month for rent, utilities, platform base fees, software, insurance, accounting, admin, and fixed marketing. |
Treating launch equipment purchases as monthly break-even expenses instead of separate cash needs. |
| Payroll capacity steps |
Semi-fixed |
Add salaries when staffing steps up, such as designers, print operators, marketing, support, and fulfillment roles by FTE plan. |
Treating all payroll like direct labor already captured in unit inputs. |