The 2.875% Question: When to Rent Out Your Austin Home Instead of Selling

The cheapest mortgage you'll ever have is the one you already locked in three years ago. A lot of Austin homeowners are quietly walking away from theirs because nobody ran the math out loud for them. If your rate starts with a 2 or a 3, selling your home this year might be the most expensive decision you make this decade.

That doesn't mean you should keep it. It means the question deserves an actual answer instead of the reflexive "list it and move on" advice most sellers get the first time they call an agent.

Why this question hits differently in 2026

When rates were 3%, holding versus selling was a casual comparison. Now, with a 30-year fixed sitting in the 6s, your old loan is its own asset. The spread between what you're paying and what a new buyer would pay on the same house often equals $700, $1,000, sometimes $1,400 a month in carrying-cost difference.

That spread doesn't disappear when you sell. It transfers to the buyer. The real question is whether you're better off capturing the value yourself by renting the home and keeping the mortgage, or cashing out and reinvesting the equity somewhere else.

The honest cash-flow math

Most online "should I rent it out" calculators are useless because they skip the line items that actually break the math. Here's what to put on paper, with a representative Austin scenario.

Imagine a 2,400-square-foot home in Cedar Park bought in 2021 for $475,000. Balance today: roughly $400,000. Principal and interest at 2.875% comes to about $1,660 a month.

Income side: Long-term rents for that size of home in Cedar Park sit in the $2,800–$3,200 range depending on finishes and street. Use the low end for planning: $2,800.

Expense side, monthly:

• P&I: $1,660
• Property taxes: roughly $700–$850 once you lose the homestead cap (more on that below)
• Landlord insurance: around $150
• Vacancy reserve (5–8% of rent): $170
• Maintenance reserve (1% of home value annually, divided by 12): about $400
• Property management if you're not local (8–10% of rent): $250–$280
• HOA if applicable: variable

Add it up. Self-managed, the example above lands around $3,080 a month against $2,800 in rent. You're cash-flow negative roughly $280 a month, or about $3,360 a year.

That sounds like a no. Until you remember what's hiding inside the P&I.

The piece nobody puts in the calculator

That $1,660 monthly payment isn't all "cost." A meaningful chunk is principal paydown — equity you're capturing every month even if rent only covers the mortgage. On a 2.875% loan with $400,000 remaining, you're paying down somewhere in the neighborhood of $900–$1,000 in principal per month in year one of the rental, and that number climbs every year.

Now run it again. Your "loss" on paper is $280 a month. Your equity capture is roughly $950 a month. Net wealth created, before any appreciation: about $670 a month, or $8,000 a year.

If the home appreciates even 3% annually, a number well below Austin's long-run average, you're adding roughly $14,250 a year in appreciation on a $475,000 home. Combined, you're capturing $22,000+ a year of wealth that never shows up in any monthly cash-flow comparison.

The mistake most homeowners make is thinking like a renter looking at rent versus mortgage. You need to think like a balance sheet.

Where this math actually falls apart

This isn't a blanket case for holding everything. There are real scenarios where selling is the right call, and they deserve to be named honestly.

You need the equity to buy the next house. If selling frees the down-payment money for your next purchase and you can't qualify for the new mortgage while carrying the old one, the math is academic. Your DTI ratio wins. Sell.

The home doesn't rent for anywhere close to PITI. In some Austin submarkets, particularly higher-end pockets of Westlake, Tarrytown, or parts of Steiner Ranch, the rent-to-value ratio is low enough that even a sub-3% mortgage doesn't cover carrying costs once everything is loaded in. A $1.5M home that rents for $5,500 doesn't pencil. The cash flow gap is too deep to bridge with principal capture alone.

You're not actually willing to be a landlord. Long-distance landlording from California or Colorado, where many Austin sellers are headed, is not a low-effort hobby. A bad tenant in Texas costs three months of rent minimum and a lot of stress. If you're not going to hire a property manager and you're not going to be on top of it yourself, you're better off selling.

The home has deferred maintenance about to hit. A roof, HVAC, foundation, or major system at end-of-life turns the math into a guessing game. Better to sell to a buyer who'll handle those costs themselves than to absorb them while a tenant is in the property.

The Austin-specific wrinkle nobody talks about

Texas property taxes change when you stop using the home as a homestead. The 10% annual appraisal cap on homesteaded properties disappears the year after you stop living there as your primary residence. Your appraised value can — and likely will — jump to full market value at the next assessment.

That doesn't disqualify the rental play. It means you need to model your tax bill at full market value, not at the homesteaded value you've been paying. For a home you've owned since 2020 or 2021, that delta can be $2,000–$4,000 a year. Build it into the projection before you commit, not after the first appraisal notice shows up in April.

The other thing to know: short-term rental rules in Austin are a separate conversation entirely, and they've tightened. Don't assume a property that rents for $4,000 a month long-term will produce $7,000 a month on Airbnb in the current regulatory environment. If your math depends on STR income, it depends on whether your specific zoning and licensing path holds up under current rules. That's a question worth answering before you make the decision, not after.

The decision framework

Three questions, in order:

1. Can you qualify for your next mortgage while still carrying this one? If no, the conversation ends here. Sell.
2. Does rent cover PITI plus a realistic operating reserve, within 10% either way? If you're $1,000 a month underwater, the principal-paydown math doesn't save you.
3. Are you willing to manage it, or willing to pay 8–10% to someone who will? If neither, sell.

If you clear all three, hold. A sub-4% mortgage on a property that comes close to breaking even after expenses is one of the most efficient wealth-building instruments most homeowners will ever have, and you're handing it to someone else when you sell.

What to do before you decide

Before you list your Austin home this year, get two numbers on paper. The first is your honest expected net proceeds — sale price minus 6–8% all-in costs (agent compensation, title, escrow, prorations, repair credits, the works). The second is your honest rental projection with every expense and reserve loaded in, including the property-tax reset.

Compare them not as a one-year question but as a five-year and ten-year question. Most homeowners who run the math seriously land somewhere in the middle: they want to keep the low-rate mortgage, but they don't want to be landlords forever. A defined five-year hold, then sell, often pencils dramatically better than either extreme — and lets you exit on a timeline that respects the rest of your life.

That decision is worth more than almost any other call you'll make about your home this year. Don't make it on autopilot.