Freelancer quarterly estimated tax calculator (2026)

For US sole proprietors and 1099 contractors. Enter your numbers; every step of the math is shown below the result. Nothing is stored.

Net profit so far this year (income minus business expenses) Cash basis: money actually received minus expenses actually paid. As of date Used to project the full year. Defaults to today. Filing status State State figure is a rough flat-rate estimate. Estimated tax already paid this year (federal) Estimated tax already paid this year (state) W-2 federal withholding this year, if any From a day job or spouse's job (if filing jointly). Last year's total federal tax (line 24 of your 2025 Form 1040) Unlocks the safe-harbor comparison. Last year's AGI was over $150,000 ($75,000 if married filing separately)

Want this computed from your actual invoices, every quarter?

retn is a bookkeeper that works by email. Cc a private address on your invoices, forward receipts and payout emails, and get monthly books, quarterly estimates like this one, and a Schedule C packet in January. No bank connection, no app.

Try it: forward one invoice or receipt to try@in.retn.ai. You'll get a reply in a few minutes.

Notes

This calculator assumes all income is self-employment income, the standard deduction, no dependents or credits, and the 20% qualified business income deduction where the income threshold allows. It ignores state brackets, local taxes, and the additional 0.9% Medicare tax on wages. It is an estimate, not tax advice.