| Recurring office and admin overhead |
Fixed |
Include $6,000 per month for rent, legal and accounting, internal tools, base security, support software, utilities, and supplies. |
Spreading stable overhead across each subscriber and hiding the true monthly burn. |
| Core payroll |
Fixed |
Use committed salaries for the founder, lead engineer, and marketing manager in the first operating year before testing break-even. |
Treating payroll like it falls when paid users dip for one month. |
| App store fees |
Variable |
Apply the effective rate to subscription revenue: 5.0% in the first year, falling to 3.0% by the mature year. |
Treating app store fees as fixed overhead instead of a direct revenue haircut. |
| Performance marketing and user acquisition |
Variable |
Model as revenue-linked spend, starting at 8.0% in the first year and easing to 6.0% by the mature year. |
Using only CAC and forgetting ongoing paid acquisition still moves with growth. |
| Financial data aggregator fees |
Variable |
Charge this against revenue at 2.5% in the first year, declining to 1.5% as scale improves. |
Treating data access as fixed when paid users drive more connected accounts. |
| Cloud hosting and data security usage |
Semi-variable |
Keep the base security platform fixed, but let usage-linked hosting and security run at 1.5% of revenue in the first year. |
Bundling all security spend into overhead and missing usage drag on margin. |
| Support, product, and design headcount additions |
Semi-fixed |
Add capacity in steps: support in Year 2, then product manager and UI/UX designer in Year 3. |
Smoothing new hires evenly across users instead of adding them when capacity changes. |