Yes, Utah does tax Social Security, but most retirees end up paying nothing on their benefits because of a state tax credit built specifically to offset that liability. The state applies its flat 4.5% income tax to whatever portion of your Social Security the IRS treats as taxable, then a nonrefundable credit cancels that tax dollar-for-dollar until your modified adjusted gross income passes $54,000 for single filers or $90,000 for married couples filing jointly. Above those lines, the credit shrinks and eventually disappears.
Where the Taxable Amount Comes From
Utah does not run its own calculation on your benefits. It uses the federally taxable figure the IRS puts on line 6b of your Form 1040 or 1040-SR, and that number flows directly into your Utah return as part of federal adjusted gross income.1Internal Revenue Service. Publication 915 (2025), Social Security and Equivalent Railroad Retirement Benefits
The IRS decides that amount using “provisional income,” which is your AGI plus any tax-exempt interest plus half of your Social Security benefits. If provisional income stays under $25,000 (single) or $32,000 (married filing jointly), none of your benefits are federally taxable, and Utah has nothing to tax. Between those floors and the next tier ($34,000 single, $44,000 joint), up to 50% of benefits can be taxed. Above the upper tier, as much as 85% of your benefits can be included, which is the ceiling regardless of how high your income goes.2Office of the Law Revision Counsel. 26 USC 86 – Social Security and Tier 1 Railroad Retirement Benefits These thresholds haven’t moved for inflation since the 1980s and 1990s, so a growing share of retirees see some portion of their benefit federally taxed each year.
Utah’s 4.5% Rate on the Taxable Portion
For tax years beginning on or after January 1, 2025, Utah taxes all income at a flat 4.5%.3Utah State Tax Commission. Tax Rates If $15,000 of your Social Security is federally taxable, Utah’s raw calculation applies 4.5% to that $15,000, producing $675 of tax before any credits. That number matters less than it looks, because the state’s Social Security credit is designed to wipe it out.
The Credit That Cancels the Tax
Utah offers a nonrefundable Social Security benefit tax credit that directly offsets the state tax on your federally taxable benefits. Retirees under the income thresholds pay zero state tax on their Social Security, even though the benefit sits inside taxable income on paper.
Anyone whose return includes taxable Social Security retirement, disability, or survivor benefits can claim it. There is no minimum age. What determines whether you get the full credit, a reduced one, or none at all is your modified adjusted gross income.
Income Thresholds for 2025
The credit begins to phase out at these MAGI levels for tax years beginning on or after January 1, 2025:4Utah Legislature. Taxation of Social Security Benefits
- Single filers: $54,000
- Married filing jointly: $90,000
- Head of household: $90,000
- Married filing separately: $45,000
These figures were raised from $45,000, $75,000, and $37,500 respectively in 2025. Stay under your threshold and the credit covers 100% of Utah’s tax on your benefits.
How the Phase-Out Works
Above the threshold, the credit is reduced by $0.025 for every additional dollar of MAGI, which comes out to $25 lost per $1,000 of income over the line.4Utah Legislature. Taxation of Social Security Benefits The maximum credit equals your federally taxable Social Security multiplied by 4.5%. Once the reduction eats through that maximum, the credit is gone.
A worked example: a single filer with $20,000 of federally taxable Social Security and a MAGI of $70,000.
- Maximum credit: $20,000 × 4.5% = $900
- MAGI over threshold: $70,000 − $54,000 = $16,000
- Phase-out reduction: $16,000 × $0.025 = $400
- Credit remaining: $900 − $400 = $500
- Utah tax owed on the benefit: $400
At a MAGI of $90,000, that same filer’s credit hits zero: ($90,000 − $54,000) × $0.025 = $900, matching the full maximum. A married couple filing jointly with $25,000 of taxable benefits carries a larger maximum credit of $1,125, so their credit doesn’t disappear until MAGI reaches roughly $135,000. Retirees with bigger benefits keep the credit longer; those with modest benefits lose it at lower incomes.
Because the credit is nonrefundable, it can zero out your Utah liability but cannot generate a refund beyond that.
Social Security Credit vs. Retirement Credit
Utah also offers a general retirement tax credit worth up to $450 per person, and a separate military retirement credit. You can only claim one of the three on the same return. Claiming the Social Security credit locks out the other two.
For most retirees with meaningful Social Security income, the Social Security credit is worth more than $450. But if the taxable portion on line 6b is small, the retirement credit may save more. A retiree with just $4,000 of taxable Social Security would get a maximum Social Security credit of $180 (4,000 × 4.5%), well below the $450 retirement credit. Run both calculations using the worksheets in Utah’s TC-40 instructions and take the larger one.
Claiming the Credit on Form TC-40
Complete your federal return first. The taxable Social Security amount on line 6b flows into Utah Form TC-40 through federal AGI, and Utah applies its 4.5% rate to produce a gross state liability.3Utah State Tax Commission. Tax Rates Then work through the Social Security Credit Worksheet in the TC-40 instructions, which compares your MAGI to the phase-out threshold and computes any reduction. The final credit amount goes on Form TC-40A and carries into your tax calculation on the TC-40.5Utah State Tax Commission. TC-40 Instructions
When You Actually Owe Something
Utah does not require quarterly estimated tax payments. Whatever state tax you owe for the year is due by the return deadline, typically April 15 for calendar-year filers, and penalties plus interest accrue on late payments.
For retirees whose only income is Social Security and whose MAGI stays under the threshold, this rarely matters because the credit erases the tax. It becomes a real issue when other income — pensions, investment gains, part-time wages — pushes MAGI above the phase-out line and produces a balance due. You can pay in a lump sum by the filing deadline or increase withholding from other income sources like a pension. The Social Security Administration allows voluntary federal withholding at 7%, 10%, 12%, or 22% of your monthly benefit, though that covers only federal tax and does not reach your Utah liability.6Internal Revenue Service. Social Security Income