Should You Keep Your Sub-3% Mortgage as a Rental, or Sell It, in Utah?

Rate and tax rules: Freddie Mac Primary Mortgage Market Survey, week ending August 27, 2026 (30-year fixed averaged 6.66%); IRS Section 121 rules, IRC 121(b)(4)(C)(ii)(I). Home price: Salt Lake Board of Realtors, Q2 2026 (Salt Lake County single-family median $645,000, a record). Rent: Rentometer single-family rent data, August 31, 2026. Property tax structure: Utah State Tax Commission Primary Residential Exemption. Insurance: Insurance Information Institute landlord-vs-homeowners cost data, 2026. Page last updated September 1, 2026.

What actually makes a sub-3% mortgage different?

It's the rate, not the house. A 30-year fixed averaged 6.66% for the week ending August 27, 2026, per the Freddie Mac Primary Mortgage Market Survey. If you closed in 2020 or 2021 near 2.75% to 3%, your payment on that loan is locked at less than half of what the same loan costs today. That gap doesn't close when you move. It either goes to whoever buys your house, or it keeps working for you as a landlord. Selling gives the gap away for good. Renting keeps it, but renting adds real costs a primary residence never had. Both are fine choices. Neither is free.

What would this house actually rent for?

Not what a Zillow estimate says. Per Rentometer's single-family rental data as of August 31, 2026, a typical 3-bedroom house rents for around $2,300 a month statewide. It's closer to $2,600 in Salt Lake County, and around $2,100 to $2,200 in the Ogden metro area. Those are starting points, not your number. A real comp pulled for your street, your square footage, and your condition is the only rent figure worth building a decision around. I can run that for you before you decide anything.

Does the cash flow actually work?

Here's a worked example, not a real transaction, so you can see how the pieces fit together. Say you bought a $420,000 Wasatch Front home in 2020 with 10% down, a $378,000 loan at 2.875% fixed for 30 years. Principal and interest on that loan runs around $1,570 a month. After six years of payments, the balance is down to roughly $326,000. Say the house is worth something close to Salt Lake County's Q2 2026 median of $645,000, per the Salt Lake Board of Realtors.

	As your primary residence	As a rental
Principal & interest	~$1,570	~$1,570 (unchanged)
Property tax	~$285	~$518
Insurance	~$150	~$185
All-in monthly	~$2,005	~$2,273

Illustrative example only, not a real property. Tax and insurance figures are estimates built from the sourced rates and rules on this page, not a quote. Confirm your actual numbers with your county assessor and your insurance agent.

Against a $2,600 Salt Lake County rent, that's about $325 a month left over, and you haven't paid a property manager, covered a vacant month, or set aside a dollar for a new water heater yet. That's where most keep-it-as-a-rental math stops. It's the wrong place to stop.

Why does the property tax jump so much once it's a rental?

This is the part most accidental landlords don't see coming. Utah exempts 45% of a primary residence's fair market value from property tax, so an owner-occupied home is taxed on only 55% of its value, per the Utah State Tax Commission. A rental doesn't qualify. Taxed on 100% of value instead of 55%, the same house runs roughly 82% higher in property tax alone. That's where the $285-to-$518 jump above comes from. It's a real, permanent cost of converting the house, not a paperwork issue, and county assessors do check occupancy.

What does insurance cost once you're a landlord?

More, and for a real reason. A landlord policy covers a tenant-occupied home differently than a standard homeowners policy covers an owner-occupied one, including lost rental income if a covered claim makes the house unlivable. Landlord insurance typically runs 15% to 25% higher than a comparable homeowners policy on the same house, per the Insurance Information Institute. Budget the higher number, not what your current policy shows, before you decide the math works.

What do property management and vacancy actually take?

Local property managers typically charge around 8% to 10% of collected rent, plus a placement fee when they find a new tenant. Even if you self-manage to skip that fee, budget for the months the house sits empty between tenants and for the repairs every rental needs, typically another 10% to 15% of rent combined for vacancy and maintenance on an older home. Skipping that reserve doesn't make the cost go away. It just means the water heater failure shows up as a surprise instead of a line item.

Run the full stack on the example above, self-managed with honest reserves, and that $325 a month of gross cash flow gets thin. Some months it goes negative before it turns into a check. That's not a reason to rule out keeping the house. It's a reason to stop treating month-one cash flow as the whole return. The rest is real too: roughly $500 a month of that mortgage payment is going straight to principal right now, not interest, quietly building equity on a house you don't live in anymore.

This math changes fast by price band

A $645,000 Salt Lake County rental and a $645,000 Ogden or Tooele County rental aren't the same decision. A smaller loan against a smaller but still real rent, the kind of math you see at Weber and Tooele County price points, tends to land closer to break-even or better on cash flow alone, even before principal paydown or appreciation. A high-value Salt Lake or Utah County home usually needs the equity story, not the monthly check, to make sense. Know which one you actually have before you decide.

What happens to your tax-free profit if you rent it out instead of selling?

This is the deadline nobody mentions until it's already passed. Section 121 of the tax code lets you exclude up to $250,000 of gain, $500,000 for a married couple filing jointly, when you sell a home you owned and used as your primary residence for at least 2 of the 5 years before the sale, per the IRS. Move out and start renting, and the clock doesn't stop. Under IRC 121(b)(4)(C)(ii)(I), the time you rent it after moving doesn't count against you as long as you still meet the 2-of-5-years test when you finally sell, which in practice gives you roughly a 3-year window from the day you move out. Sell inside that window and the gain can still come out tax-free, up to the limit. Sell after it closes, and every dollar of appreciation since your last day living there is a taxable capital gain instead. Mark the actual date on a calendar. It's the single most expensive deadline in this whole decision.

What tax hits when you eventually do sell a rental instead of a primary residence?

Two separate things, and most people only know about one. First, once the Section 121 window closes, the profit is taxed as a capital gain like any investment sale. Second, any depreciation you deducted while it was a rental gets recaptured at sale, taxed at your ordinary income rate up to a maximum of 25%, under the unrecaptured Section 1250 gain rules. This page is general education, not tax advice, and your actual numbers depend on your basis, your income, and rules that change. Run your specific situation past a CPA before you decide anything based on it, especially before that 3-year window closes.

Can the rent even help you qualify for your next house?

Often, yes, and that changes the "I'm stuck" feeling more than you'd expect. Keep this house as a rental and buy a new primary residence, and Fannie Mae generally lets a lender count 75% of the documented lease income from your departing home toward qualifying for the new mortgage, without requiring prior landlord experience, per Fannie Mae's Selling Guide. Freddie Mac allows the same rent to offset the old home's payment, but only counts it as extra qualifying income once you have a year of landlord experience. A separate product, a DSCR loan, qualifies the new purchase off the rental property's own income instead of your personal debt-to-income ratio at all. None of these are guarantees. All of them are worth a real conversation with a licensed lender before you assume the math doesn't work.

When does keeping the house actually beat selling it?

• You're still inside the Section 121 window. Sell later, after it closes, and you add a real tax bill that keeping it inside the window avoids entirely.
• The honest, reserve-adjusted cash flow is at or near break-even, not deeply negative. A house that loses real money every month isn't a rental. It's a second mortgage with a tenant.
• You want the payment to help you qualify for your next home, using the departing-residence rent rules above.
• You're comfortable being a landlord, or comfortable paying someone else 8% to 10% of the rent to be the landlord for you.

When does selling actually beat keeping it?

• You're close to or past the 3-year Section 121 window and haven't moved back in.
• The reserve-adjusted math is meaningfully negative once you count property tax at the non-primary rate, real insurance, and honest vacancy and maintenance reserves.
• You want the equity working somewhere else, a different property, a different investment, or just less to manage.
• You don't want to be a landlord, and paying someone else to do it doesn't change that feeling. That's a real answer, not a wrong one.

How do you actually decide, for your specific house?

Start with three numbers only I can pull accurately for your address: a real rent comp for your street and condition, a real current value, and the exact date your Section 121 window closes if you've already moved out. Then run the reserve-adjusted cash flow above with your actual loan balance and rate, not the illustration here. Talk to your lender about whether the rent helps you qualify for a move, and talk to a CPA about your specific gain and depreciation numbers before the window closes. I'll run the real estate side of that math with you at no cost, and tell you honestly which way it points, even if that means selling.

Talk with Cory Salisbury, Realtor with KW Westfield, helping Utah families since 2014.

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General market education, not mortgage, financial, tax, or legal advice. Cory Salisbury is not a mortgage broker, lender, or CPA. Rate, price, rent, tax, and insurance figures are dated third-party estimates that change and are not a guarantee of your actual costs, qualification, or tax outcome. Confirm your actual payment and qualification with a licensed lender, and confirm your specific tax and depreciation numbers with a CPA before making a decision, especially near the Section 121 deadline. Cory Salisbury, Realtor, KW Westfield. Equal Housing Opportunity.