Utah keeps it simple on dates and unusual on mechanics. For the 2025 tax year, every Utah return type files by April 15, 2026, including S-corporations and partnerships, which do not follow the federal March deadline. Utah also grants an automatic extension with no form, requires a prepayment to use it, and does not make individuals file quarterly estimates at all. Those three quirks are what trip up preparers new to the state.

What are Utah's 2026 tax filing deadlines?

For the 2025 tax year, Utah individual (TC-40), C-corporation (TC-20), S-corporation (TC-20S), and partnership (TC-65) returns are all due April 15, 2026. Utah uses the 15th day of the fourth month for pass-throughs, so the TC-20S and TC-65 are a month later than the federal 1120-S and 1065.

How does Utah's automatic extension and prepayment rule work?

Utah grants an automatic six-month extension to file, to October 15, 2026, with no extension form required. To avoid the extension penalty, the taxpayer must prepay by April 15, 2026 the lesser of 90% of the current-year tax or 100% of the prior-year tax. The prepayment coupon is Form TC-546. The extension covers filing, not payment, so any unpaid balance still accrues interest from April 15.

Does Utah require estimated tax payments?

Individuals do not. Utah states plainly that it does not require quarterly estimated payments for individuals; the state relies on withholding plus the extension prepayment safe harbor. Corporations are different: a corporation with a Utah liability of $3,000 or more must make quarterly payments on the 15th day of the 4th, 6th, 9th, and 12th months (Form TC-559). Every corporation filing a TC-20 also owes the $100 minimum tax, which does not apply to S-corporations.

What is Utah's SALT (pass-through entity) election?

Utah offers a pass-through entity tax election that lets the entity pay Utah tax so owners can deduct it above the federal SALT cap. It is available for 2025. The mechanics are timing-sensitive: the entity e-files the SALT report and makes an electronic SALT payment through TAP by the last day of the tax year, December 31, 2025 for calendar-year filers. Once a valid payment is made, the election is irrevocable for that year. Miss the December payment and the election is gone, so this is a fourth-quarter planning item, not an April one.

How does a firm handle Utah at scale?

Two things to systematize. First, the pass-through date: any workflow that batches S-corps and partnerships to March 15 will mis-date every Utah return, so the April 15 state date has to be tracked on its own. Second, the prepayment and SALT election are both off-season actions. The prepayment safe harbor is set by April 15 and the SALT election by December 31, neither of which lines up with the filing date a tracker usually keys on. Flag those clients ahead of the deadlines rather than at filing. See how we think about scaling tax prep workflows.

Where do these dates come from?

All deadlines and thresholds here trace to the Utah State Tax Commission. Verify against the source before filing.