If you earn 1099 or self-employment income in Utah, the IRS and the state both expect you to pay taxes as you go — in four quarterly installments rather than one April bill. This calculator estimates your 2026 quarterly payments across all three pieces: federal self-employment tax, federal income tax, and Utah state income tax. Utah has a flat income tax — 4.45% for 2026, down from 4.5% in 2025 — but a Taxpayer Tax Credit effectively shields part of your income and phases out as you earn more. Enter your expected net self-employment income, any W-2 wages, and your filing status to see what to send each quarter, your due dates, and how the safe-harbor rules protect you from an underpayment penalty. Everything is an estimate for planning — always confirm with the Utah State Tax Commission before you file.
Self-employment income has no tax withheld for you, so both the IRS and Utah State Tax Commission ask you to prepay in quarterly installments. On the federal side you owe self-employment tax (15.3% Social Security and Medicare on 92.35% of your net profit, up to the Social Security wage base) plus federal income tax on your profit after the standard deduction. On top of that, Utah applies its own income tax.
Utah sets its own threshold for when estimated payments become mandatory — check with Utah State Tax Commission for the current figure. Utah follows the federal schedule: April 15, June 15, September 15, and January 15. You avoid a penalty by prepaying 90% of this year's tax or 100% of last year's. Utah follows the standard four-installment schedule.
You avoid an IRS underpayment penalty by hitting a "safe harbor": paying at least 90% of this year's total tax, or 100% of last year's (110% if your income is higher). Utah applies a flat 4.45% (2026, down from 4.5% in 2025) to your federal AGI, then subtracts the Taxpayer Tax Credit — 6% of your federal standard deduction, reduced by 1.3% of income over $18,213 (single) / $36,426 (joint). The credit thresholds shown are the latest published (2025) values. You can pay online through the Utah State Tax Commission portal, and the calculator above breaks your total into the federal and Utah pieces so you can send each to the right place. You can pay online at the Utah State Tax Commission (payment portal).
For educational purposes only — not tax advice. Tax rules change and individual situations vary; confirm figures with a tax professional and the Utah State Tax Commission before filing. State tax data last verified 2026-07-05.
Sources: tax.utah.gov, tax.utah.gov.