How to include taxes in a freelance rate without guessing

Understand effective versus marginal rates

A marginal rate applies to the next slice of taxable income. An effective rate is the average share of taxable profit paid across the whole amount. Business structure, location, deductions, social contributions, filing status, and other income can change both.

• Use last year’s actual total tax divided by the relevant profit as a starting reference.
• Adjust for known changes with a qualified professional.
• Keep sales tax or VAT collected for authorities separate from your revenue.

Gross up instead of adding the percentage

If you need to retain $80,000 after an estimated 25% effective tax, dividing by 0.75 gives about $106,667 before tax. Simply adding 25% produces $100,000, which would retain only $75,000 after the same assumption.

• Gross-up formula: after-tax goal ÷ (1 − effective rate)
• Illustration: $80,000 ÷ 0.75 = $106,667
• Then add business costs and divide by billable capacity.

Keep the estimate conservative and reviewable

Maintain a separate tax reserve, review the percentage as profit changes, and avoid treating the calculator as jurisdiction-specific advice. If your structure or location changes, rebuild the assumption before repricing long engagements.

Do not send tax assumptions to analytics

RatePilot keeps calculator inputs in your browser. Its analytics events describe tool usage without attaching your entered income, cost, or tax amounts. Shared calculator links are different: they can contain the values in the URL, so treat them as sensitive.