| Workshop rent |
Fixed |
Carry $2,500 per month as baseline overhead. |
Spreading rent across units and hiding idle capacity. |
| Business insurance |
Fixed |
Carry $250 per month regardless of order volume. |
Flexing insurance with sales when the model lists it monthly. |
| Blank material inputs |
Variable |
Apply per unit: boards $3.00, glassware $2.00, pens $0.40, plaques $12.00, signs $25.00. |
Using one blended material rate when product mix changes. |
| Direct engraving labor |
Variable |
Apply per unit, from $0.15 for pens to $10.00 for business signs. |
Treating production labor as fixed when it scales with jobs. |
| Packaging materials and shipping labels |
Variable |
Apply per unit based on each product’s packaging and label allowance. |
Leaving fulfillment out because each item looks small. |
| E-commerce platform fees |
Variable |
Apply 1.9% of first-year revenue, then the model steps down in later years. |
Modeling fees as a flat monthly software bill. |
| Utilities |
Semi-variable |
Use $600 per month plus workshop utilities at 0.1% of revenue. |
Classifying all utilities as fixed and missing usage load. |
| Operating payroll |
Semi-fixed |
Model salaries in steps as full-time equivalent staffing rises across roles. |
Treating each added hire as a smooth percentage of sales. |