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Billable time is the limiting factor.
Quoting, travel, maintenance, weather delays, and administration reduce your available selling time. Use realistic working weeks and billable hours. The result is a revenue target, not a wage rate for an employee.
Define your revenue buffer.
The buffer reserves a percentage of revenue beyond owner income and annual overhead. It is a planning allowance, not a tax rate or a personalized tax estimate. Include all recurring costs in your annual budget and check each job separately.