Utah State Tax Commission Income Tax Audit Protest

The situation

Mountain West Software LLC is a 7-person software company in Salt Lake City structured as an S-Corp. In May 2026 the Utah State Tax Commission issued a Notice of Deficiency of $12,400 + $1,240 penalty + $890 interest after auditing the 2023 Utah S-Corp composite return. The Commission's finding: two out-of-state shareholders were included in the Utah composite return at the full 4.65% flat rate on their entire distributed income, but the Commission says their income should be apportioned using Utah's sales-factor apportionment, not allocated at 100%.

What the S-Corp doesn't know: Utah S-Corp composite returns for nonresident shareholders apportion income based on the S-Corp's business activity in Utah vs. other states, specifically the sales factor (Utah sales ÷ total sales). If the software company has significant out-of-state revenue (say, 65% of sales to non-Utah customers), only 35% of the nonresident shareholders' distributed income is Utah-source income. The Commission's assessment appears to have applied the flat rate to 100% of distributed income, ignoring apportionment, which could reduce the assessment by $8,000 or more.

Who receives this

Utah S-Corp shareholders, part-year residents, and businesses receiving Utah State Tax Commission income tax deficiency notices. Primary segment: tech company S-Corps and LLCs with nonresident owner/shareholders who incorrectly had Utah tax applied to out-of-state-sourced income.

Why the agency will not advise you

Utah's 30-day hard deadline creates urgency. TAP is compliance-only. Tax Commission cannot advise on contesting its own notices. No self-serve navigator found.

Key facts, with sources

• Utah imposes individual and corporate income tax at a flat rate of 4.65% under UCA §§ 59-10-104 and 59-7-201. The Utah State Tax Commission audits income tax returns; when the Commission determines a deficiency, it issues a Notice of Deficiency. The taxpayer has 30 days from the Notice to file a Request for Redetermination with the Tax Commission. Once filed, the case is assigned to a Tax Commission Administrative Law Judge (ALJ) who schedules a telephone status conference (typically within 60–90 days) to screen the case and allow parties to work toward resolution. If the conference does not resolve the dispute, the ALJ conducts a formal hearing. The ALJ's decision can be appealed to the Utah Supreme Court. Utah's Taxpayer Access Point (TAP) handles filing, payment, and account management, not protest strategy. Utah tax attorneys at Pearson Butler and Huntsman/Lofgran provide audit defense at $2,500–$8,000 per matter. No self-serve Utah income tax audit protest navigator was found. Source: Appeals of Audit Assessments — Utah State Tax Commission · Utah State Income Tax Audits — Pearson Butler Tax Attorneys · Utah's Taxpayer Access Point

When to bring in a professional

Self-serve responses fit routine cases: clear facts, amounts a business can absorb, and a deadline still ahead of you. Bring in a licensed professional when the amount at stake is large relative to their fee, the facts are genuinely disputed, criminal exposure is possible, or the deadline has already passed. A short paid consultation to sanity-check your plan is often worth it even when you handle the filing yourself.

All sources for this guide

1. Appeals of Audit Assessments — Utah State Tax Commission
2. Utah State Income Tax Audits — Pearson Butler Tax Attorneys
3. Utah's Taxpayer Access Point