Utah's 45% Residential Exemption When You Own Two Homes
Program and regulatory figures verified September 25, 2026. Details change; confirm your scenario with us.
The 45% is the largest single line in a Utah property tax bill and the easiest one to lose by accident. Here is the statute, and what it does during the weeks you own two houses.
What the exemption actually does
Utah does not tax residential property on its full market value. Utah Code 59-2-103(3) allows a residential exemption equal to a 45% reduction in the value of the property, subject to subsections (4) through (6) and to Section 59-2-103.5. What remains, 55% of market value, is the taxable base the mill rate is applied to.
On a home valued at $600,000 the reduction takes the taxable base to $330,000. The exemption is not a credit or a rebate. It changes the assessed value itself, which is why it shows up in an escrow estimate and therefore in your debt-to-income ratio.
One primary residence per household
Subsection (6)(a) is the constraint that matters for a move: except as provided in (6)(b)(ii) and (iii), a residential exemption under (3) is limited to one primary residence per household.
The word household is defined in the statute rather than left to inference. Under (1)(a)(i) it means the association of individuals who live in the same dwelling, sharing the dwelling's furnishings, facilities, accommodations and expenses. Under (1)(a)(ii) it also includes married individuals, who are not legally separated, who have established domiciles at separate locations within the state.
That second clause exists to stop the obvious planning move. A married couple cannot split into two households by holding two Utah addresses. The Tax Commission is authorized under (1)(b) to make rules defining domicile.
What happens during the overlap
Picture the ordinary Utah move-up. You close on the new house in March and your current house sells in June. For those months you hold title to two Utah homes and you occupy one of them.
The house you occupy is your primary residence and carries the exemption. The house you left is vacant. It is not your primary residence and, unless someone else makes it theirs, it is not anyone's. Under (6)(a) it falls outside the one-per-household allowance.
The timing is governed by the assessment date rather than the calendar of your move. Subsection (2) values property as of January 1. A county's treatment of a mid-year change runs through the application procedure in 59-2-103.5 rather than through an automatic reassessment on the day you close, so the practical effect depends on when in the year the change happens and on how your county administers it. Ask your county assessor directly. That answer belongs in your budget before you write an offer, not after.
The application nobody expects
Section 59-2-103.5(1) lets a county legislative body adopt an ordinance requiring an owner to file an application with the county board of equalization before the exemption is applied, where any of three things is true: the property was ineligible for the exemption in the immediately preceding calendar year, an ownership interest in the residential property changes, or the board of equalization determines there is reason to believe the property no longer qualifies.
A purchase is an ownership interest changing. So the new home can require an application before it carries the 45%, and the form is prescribed by the Tax Commission. Subsection (2)(a)(iii) is worth noting for privacy reasons: the application may not request the sales price of the residential property, and under (2)(c) a county may not ask for information beyond what is on the Commission's form.
The 183-day rule
Subsection (4) covers part-year residential property. It gets the exemption described in (3) if it is used as residential property for 183 or more consecutive calendar days during the calendar year for which the owner seeks the exemption. Under 59-2-103.5(3) the owner files an application certifying the date the property became residential property and that the 183-day test will be met.
For a buyer, 183 consecutive days is the line that decides whether a purchase late in the year earns the exemption for that year at all.
One acre, and no more
Subsection (5) limits the exemption to no more than one acre of land per residential unit. On a typical Wasatch Front lot this never comes up. On acreage in Wasatch County, Summit County or the benches above Provo it does, and the land above one acre is assessed without the reduction. If you are moving from a small lot to a larger parcel, that difference belongs in the payment estimate.
Where this goes next
There is one exception in the statute that applies to a house you have moved out of, and it turns the whole calculation around. It is in subsection (6)(b)(ii) and it is about tenants. That is on the tenant exception page.
For how the three financing structures compare once you know the tax outcome, see the structures page. For the version that keeps the exemption alive, see renting out your current home.
Frequently asked questions
How much is Utah's residential exemption?
Utah Code 59-2-103(3) allows residential property a residential exemption equal to a 45% reduction in the value of the property. A qualifying primary residence is therefore taxed on 55% of its market value. On a $600,000 home the taxable base is $330,000.
Can a household claim the Utah residential exemption on two homes?
No. Utah Code 59-2-103(6)(a) limits the exemption to one primary residence per household, with narrow exceptions in (6)(b) for a property that is a tenant's primary residence and for certain properties described in 59-2-102(35)(b)(ii).
Will buying a second Utah home require a new exemption application?
It can. Utah Code 59-2-103.5(1) permits a county to require an application when an ownership interest in the residential property changes, when the property was ineligible in the preceding calendar year, or when the board of equalization has reason to believe it no longer qualifies. The form is prescribed by the Tax Commission and may not ask for the sales price.
What is the 183-day rule for Utah's residential exemption?
Utah Code 59-2-103(4) allows part-year residential property the exemption if the property is used as residential property for 183 or more consecutive calendar days during the calendar year for which the owner seeks it. The owner certifies that on the county application under 59-2-103.5(3).
Does the Utah residential exemption cover all of my land?
No. Utah Code 59-2-103(5) limits it to no more than one acre of land per residential unit. Land beyond one acre is assessed without the 45% reduction, which matters on larger parcels in Wasatch and Summit counties and on bench lots.
What date does the county use to value my Utah home?
Utah Code 59-2-103(2) provides that all tangible taxable property in the state is assessed and taxed at a uniform and equal rate on the basis of its fair market value as valued on January 1, unless otherwise provided by law.
Mike Certo · NMLS #260555 · Cornerstone First Mortgage NMLS #173855 · Equal Housing Lender. Educational content about financing, not a loan commitment and not legal, tax, or real estate advice. Utah's residential exemption is administered county by county under Utah Code 59-2-103.5, and eligibility depends on your facts; your county assessor, your CPA or a Utah attorney, and your real estate agent each handle their own part. Loans are subject to borrower and property qualification.