| Lease Payments |
Fixed |
Use $8,000 per month as baseline overhead in every break-even month. |
Lowering rent when sales dip, which overstates downside protection. |
| Business Insurance |
Fixed |
Include $400 per month before calculating contribution needed from sales. |
Leaving small fixed bills out because they seem immaterial. |
| Utilities |
Semi-variable |
Start with the $1,500 monthly plan amount, then track usage pressure as traffic rises. |
Treating all utilities as fixed even when longer hours and volume add usage. |
| Beverage Inventory |
Variable |
Apply the first operating year rate of 8.0% against revenue-linked beverage activity. |
Using the mature-year 7.0% rate too early and overstating margin. |
| Food Ingredients |
Variable |
Apply the first operating year rate of 6.0% as food sales increase. |
Modeling ingredients as a flat monthly spend instead of volume-driven usage. |
| Credit Card Processing Fees |
Variable |
Apply 2.5% of first operating year sales because fees move with paid transactions. |
Forgetting payment fees when estimating contribution margin per order. |
| Disposable Supplies |
Variable |
Apply 2.0% of first operating year sales for cups, lids, napkins, and similar order-linked supplies. |
Putting supplies into overhead and missing the true cost of each sale. |
| Staffing Payroll |
Semi-fixed |
Model payroll in staffing steps as full-time equivalent counts rise from the first year to the fifth year. |
Treating all payroll as flexible when first operating year payroll is $33,500 per month. |