Self-employment tax, federal income tax and your state's income tax, computed on your whole household picture for tax year 2026. Enter what you expect to earn this year and the share to hold back from every payment appears on the right.
A spreadsheet for Excel and Google Sheets that logs your income, expenses and miles, tells you what to move to savings each time you get paid, and shows the exact quarterly payment before each IRS due date.
15.3% on 92.35% of net profit: 12.4% Social Security up to the $184,500 wage base (less any W-2 wages already taxed) and 2.9% Medicare with no cap. Half of it is deductible.
Your household's adjusted gross income less the 2026 standard deduction and the 20% qualified business income deduction, run through the 2026 brackets for your filing status. The tax created by your 1099 work is the difference between your tax with and without it, so W-2 wages push the 1099 dollars into the right bracket.
An estimate using your state's 2026 single-filer brackets (doubled for joint filers) on federal taxable income. State deductions and credits vary, so this usually runs a little high. Nine states have no income tax on self-employment earnings.
If you expect to owe $1,000 or more, the IRS wants four payments: April 15, June 15, September 15, 2026 and January 15, 2027. You avoid penalties by paying at least 90% of this year's tax or 100% of last year's (110% if last year's income was over $150,000).