Enter your expected annual net self-employment profit and your tax rates to estimate your total annual tax and how much to pay each remaining quarter. Every rate is an input you control — nothing is hardcoded to a specific tax year, so the calculator stays accurate as brackets and caps change.
Your Schedule C net profit: 1099 income minus deductible business expenses.
Defaults to the combined 15.3% (12.4% Social Security + 2.9% Medicare). Social Security only applies up to that year's wage base, which changes annually — lower this rate if your net profit is expected to exceed the current year's cap.
Your expected marginal or effective federal rate. Tax brackets are adjusted every year, so check the current IRS tables and enter your own estimate.
Enter the details above to calculate the result.
| Period covered | Due date |
|---|---|
| Q1 (Jan – Mar income) | April 15 |
| Q2 (Apr – May income) | June 15 |
| Q3 (Jun – Aug income) | September 15 |
| Q4 (Sep – Dec income) | January 15 of the following year |
These are the standard quarterly due dates and don't change year to year, but if a date falls on a weekend or federal holiday, the actual deadline shifts to the next business day — always confirm the exact date on IRS.gov.
This is a simplified planning estimate, not tax advice. It applies a flat rate to net profit for state tax and doesn't account for the standard/itemized deduction, other income, tax credits, the Additional Medicare Tax, or the safe-harbor rules (paying at least 90% of this year's tax, or 100–110% of last year's tax, to avoid an underpayment penalty). Consult a tax professional or IRS Form 1040-ES instructions for your actual filing.