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Revenue is not take-home profit.
Deduct every cost attributable to the work and the fee charged on the customer payment. This is job-level profit before income tax and any costs you did not allocate. Include owner labor to avoid treating your time as free.
Margin and markup use different denominators.
Margin divides profit by revenue. Markup divides profit by cost. Here, both use profit after payment processing, while the markup denominator is job cost before processing. A $450 quote with $300 cost and no fees produces 33.3% margin and 50% markup.