| Office Rent |
Fixed |
Use $3,500 per month in fixed overhead for the relevant planning range. |
Spreading rent across jobs and making margin look cleaner than it is. |
| CRM Software Subscription |
Fixed |
Use $250 per month as fixed overhead unless seats or plan tiers change. |
Treating the subscription as variable because sales activity runs through it. |
| General Legal & Accounting Fees |
Fixed |
Use $1,000 per month in fixed overhead before calculating required revenue. |
Leaving recurring advisory fees below the break-even line. |
| Multiple Listing Service and Data Subscriptions |
Variable |
Model as 8% of revenue in the first year, declining to 6% by the mature year. |
Booking it as flat software spend and overstating contribution margin at higher volume. |
| Third-Party Valuation Reports |
Variable |
Model as 5% of revenue in the first year, declining to 3% by the mature year. |
Forgetting that more valuation work usually means more outside report spend. |
| Digital Marketing Spend |
Variable |
Model as 10% of revenue in the first year, stepping down to 6% by the mature year. |
Using only the annual marketing budget and missing revenue-linked acquisition pressure. |
| Consultant Performance Bonuses |
Variable |
Model as 5% of revenue in the first year, rising to 9% by the mature year. |
Treating bonuses as fixed payroll and understating the cost of each added sale. |
| Consultant and Support Salaries |
Semi-fixed |
Hold salary overhead flat until hiring steps add capacity, such as the junior consultant in Month 13 and senior consultant in Month 37. |
Mixing $51.5k of setup spend into operating break-even; it affects cash runway, not contribution margin. |