| Rent for Retail Space, $8,000/month |
Fixed |
Keep it flat in monthly break-even until the store footprint changes. |
Spreading rent by transaction and hiding the true monthly hurdle. |
| Business Insurance, $700/month |
Fixed |
Model as a recurring overhead charge from Month 1 through Month 60. |
Dropping insurance from break-even because it is not tied to sales. |
| Utilities, $1,200/month |
Semi-variable |
Use the base monthly amount, then watch for usage increases as hours and repair work grow. |
Treating every utility dollar as fixed when longer hours add usage. |
| Payroll, about $19.2k/month in the first operating year |
Semi-fixed |
Hold staffing flat within the current schedule, then step it up when coverage needs rise. |
Modeling wages as fully variable even though payroll jumps in staffing blocks. |
| Wholesale Watch Inventory, 10% of sales in the first year |
Variable |
Apply it against sales volume as the main margin driver for new watch revenue. |
Treating inventory buys as profit and loss timing instead of margin behavior. |
| Repair Parts & Consumables, 1.5% of sales |
Variable |
Scale with repair activity and include it in contribution margin math. |
Ignoring shrinkage and repair rework that can eat into repair margin. |
| Sales Commissions, 4% of sales in the first year |
Variable |
Link directly to revenue so commission expense rises only when sales close. |
Budgeting commissions as a flat salary add-on and overstating low-sales losses. |
| Payment Processing Fees, 2% of sales |
Variable |
Apply to card-based revenue because fees move with each transaction. |
Forgetting fees on high-ticket sales and overstating contribution margin. |