Utah (UT)
April 15, 2026
October 15, 2026
✓ Automatic (No Form)
UT — UtahUtah Personal Income Tax Extension — What You Need to Do
Utah gives every taxpayer an automatic six-month extension to file — no extension form or request of any kind is required. It is not, however, an extension to pay: to avoid a penalty, you must prepay at least 90% of your 2025 tax due (or 100% of your 2024 liability) by April 15, 2026.
Utah Extension Checklist — 2026
No form to file. Just make sure your prepayments clear the safe-harbor threshold by April 15.
April 15, 2026
Prepay 90% (or 100% of Last Year)
Pay Online via TAP
tap.utah.gov
Utah’s Taxpayer Access Point (TAP) lets you prepay directly — no coupon needed if you pay online.
Check with Form TC-546 Income Tax Prepayment
Utah State Tax Commission
210 N 1950 W
Salt Lake City, UT 84134-0266
TC-546 is a prepayment coupon, not an extension application — Utah has no separate extension form.
October 15, 2026
File Federal + Utah Return
File your federal return now and add your Utah state return — Form TC-40 — in the same session. Your automatic six-month extension covers this whole window with no separate filing needed to claim it.
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Utah Late Filing & Payment Penalties — What It Costs to Wait
Utah’s penalty structure is tiered by how many days late you are, plus a separate penalty specifically for under-prepaying during the extension period.
| Charge Type | Rate | Cap | Trigger |
|---|---|---|---|
| Insufficient Prepayment Penalty | 2% per month | 12% (6-month extension period) | Prepayments below 90%/100% safe harbor by April 15, 2026 |
| Late-Filing Penalty | Greater of $20 or 2%/5%/10% (tiered by days late) | 10% of unpaid tax | Return filed after October 15, 2026 |
| Interest | 6% per year (2025–2026 rate) | No cap | Accrues on any unpaid balance from April 15 |
Utah State Extension Details
| Extension Type | Automatic — No Form Required |
| Original Deadline | April 15, 2026 |
| Extended Deadline | October 15, 2026 |
| Extension Period | 6 months, automatic for every filer |
| Extension Form | None — no application required. Form TC-546 is only a prepayment coupon |
| Return Form | Form TC-40 |
| Payment Requirement | Lesser of 90% of 2025 tax due or 100% of 2024 liability, paid by April 15, 2026 |
| Online Payment Portal | Taxpayer Access Point (TAP) |
| Prepayment Mailing Address | Income Tax Prepayment, Utah State Tax Commission, 210 N 1950 W, Salt Lake City, UT 84134-0266 |
| Return Mailing Address (refund) | Utah State Tax Commission, 210 N 1950 W, Salt Lake City, UT 84134-0260 |
| Return Mailing Address (balance due) | Utah State Tax Commission, 210 N 1950 W, Salt Lake City, UT 84134-0266 |
| State Agency | Utah State Tax Commission |
| Late-Filing / Insufficient-Prepayment Penalty & Interest | Tiered late-filing penalty (cap 10%); 2%/month insufficient-prepayment penalty (cap 12%); 6% annual interest |
Utah Tax Extension — Frequently Asked Questions
Do I need to file a Utah extension form?
No. Utah automatically grants every taxpayer a six-month filing extension — there’s no application to submit. Form TC-546 is only a payment coupon, not an extension request.
What happens if I don’t prepay enough by April 15?
Your filing extension still applies, but you’ll owe an insufficient-prepayment penalty of 2% per month (capped at 12%) on the shortfall, plus interest, until you pay the balance or the extension period ends.
How much do I need to prepay?
The lesser of 90% of your 2025 tax liability or 100% of your 2024 liability, paid by April 15, 2026. First-time filers or those with no 2024 liability must use the 90%-of-current-year test.
What if I’m due a refund?
If you’re due a refund, no prepayment or penalty applies. Filing sooner still gets your refund to you faster.
Which Utah return form do I need?
Form TC-40, the Utah Individual Income Tax Return, for both residents and nonresidents.
What happens if I miss the October 15 deadline entirely?
If you don’t file by October 15, 2026, the automatic extension no longer applies and the standard late-filing penalty (tiered up to 10% of unpaid tax) applies instead, as if you’d never had an extension.
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