Fixed vs. Variable Costs
A reference for creator business operators — including the three costs that get misclassified most often.
The test: does this cost change if your sales volume changes? If no, it's fixed. If yes, it's variable.
Software subscriptions (CRM, email, editing, scheduling)
Website hosting
Community platform base fee
Retainer-based contractors
Course platform hosting fee
Insurance
Recurring software licenses
Office or studio rent
Fixed salary for employees
Payment processing fees
Platform revenue share
Advertising spend
Project-based contractor work
Affiliate payouts
Shipping or fulfillment costs
Usage-scaling email platform costs
Per-seat or per-send software fees
Where this usually goes wrong
Contractor costs are often semi-variable, not automatically fixed.
A retainer contractor is fixed. A contractor paid per project or per deliverable moves with your output — that's variable, even though "I pay a contractor" feels like one category.
Payment processing fees are frequently left out entirely.
They don't show up as a separate line item anywhere obvious — they're deducted before the money hits your account — so they're the easiest real cost to miss when building an expense list from memory.
Platform revenue shares are a cost of goods sold, not a platform cost.
If a platform takes a percentage of every sale, that's not the same category as your monthly subscription to that platform. It's directly tied to revenue, so it belongs with variable costs.