TabSalary calculator guide
Estimate a side-hustle tax set-aside
Independent workers usually do not have an employer withholding income and self-employment taxes from each payment. This planning tool applies a selected effective rate after a mileage deduction to suggest how much cash to reserve. It is intentionally simpler than a tax return.
Written by the TabSalary editorial team · Last reviewed July 21, 2026
How the calculation works
Estimated reserve = max(0, gross earnings − business miles × $0.76) × selected effective rate
- Enter gross business income received or earned for the period you are planning.
- Enter documented business miles driven on or after July 1, 2026; the tool uses the 76¢ IRS business rate effective for that period.
- Choose a rough effective tax rate that reflects income tax plus self-employment tax exposure.
- Move the estimated reserve to a separate savings account and reconcile it against quarterly estimates.
Worked example
For $150 of gross earnings and 40 qualifying business miles after June 30, 2026, the mileage estimate is $30.40. The remaining $119.60 multiplied by a 25% planning rate suggests reserving $29.90. Actual deductible mileage and tax depend on eligibility, records, total annual income, filing status, state law, and other expenses.
What this estimate does not include
- This is not a tax return and does not calculate brackets, credits, quarterly safe-harbor rules, state taxes, or the deductible portion of self-employment tax.
- The 76¢ rate applies to eligible business mileage from July 1 through December 31, 2026; earlier 2026 mileage uses 72.5¢.
- Commuting is generally not deductible business mileage. Keep contemporaneous records and consult a qualified tax professional for your circumstances.
Use the result as a planning estimate, not as personalized financial, tax, legal, or investment advice.