For homeowners approaching retirement with a highly appreciated residence, the decision to relocate can open the door to a tax planning opportunity many people never consider. Converting your primary residence into a short-term rental before you sell may let you pair accelerated depreciation deductions with the Section 121 capital gain exclusion.
When done well, that strategy may reduce lifetime taxes and improve your after-tax retirement cash flow. When done casually, it can cost more than it saves. The details are where this strategy lives or dies, so here they are.
How the home conversion strategy works
The strategy starts when you buy your next home and convert your current one into a short-term rental instead of selling it right away. You collect rental income, claim depreciation deductions during your peak earning years when your marginal rate is often highest, and then sell while you still qualify for the Section 121 exclusion.
Every step in that sequence has a rule attached to it. Miss one and the math can turn against you.
Section 121 of the Internal Revenue Code lets eligible homeowners exclude up to $250,000 of gain, or $500,000 for certain married couples filing jointly, on the sale of a primary residence. You generally need to have owned the home and lived in it as your principal residence for at least two of the five years before the sale.1
Because that lookback runs five years, you generally have up to three years after you move out to sell and still qualify. Miss that window and the exclusion goes away. You also can’t use Section 121 more than once every two years, which matters if you’ve sold another home recently.
Here’s the part that makes the strategy possible. Renting the home out after you’ve moved out doesn’t create a period of nonqualified use, so gain tied to the years you lived there stays excludable. What doesn’t stay excludable is the depreciation, and we’ll come back to that.
One more point worth stating plainly: The exclusion caps at $250,000 or $500,000. On a highly appreciated home, gain above that cap is fully taxable at long-term capital gains rates and may also draw the 3.8% net investment income tax.
What is a cost segregation study?
A cost segregation study is an engineering-based analysis of a rental property that separates a building into its parts and assigns each part the shortest write-off period that the tax code allows.
Instead of depreciating the whole structure over 27.5 years, a study moves items like appliances, flooring, cabinetry, window treatments, fencing, and landscaping into five-, seven-, and 15-year categories. Deductions land earlier, which is worth more while your tax rate is high.
For a converted home, reclassification percentages vary widely by property type. The structure itself usually lands toward the lower end of the range. Furnishing the property as a short-term rental is what pushes the total higher, because furniture, appliances, and equipment are all short-life property.
Studies come with a cost. For a residential property, one generally runs somewhere between $3,000 and $15,000, depending on the property and whether an engineer visits the site. As a rough screen, a study is worth pricing out when your depreciable basis clears about $500,000 and you’re in a high bracket.
Two basis rules that shape everything
Before you model any of this, two rules set the ceiling on what the strategy can deliver. Both of them surprise people.
Your depreciable basis is capped. When you convert a personal residence to a rental, your depreciable basis is the lower of your adjusted basis or the home’s fair market value on the conversion date. For a home that has appreciated sharply, that means you depreciate what you paid plus improvements, not what the home is worth today. Land isn’t depreciable at all, so you carve out the land portion as well.
Bonus depreciation probably doesn’t apply to the house. The One Big Beautiful Bill Act (OBBBA) permanently restored 100% bonus depreciation, but only for property both acquired and placed in service after Jan. 19, 2025. A home you bought years ago fails the acquisition test even if you place it in service as a rental today. The components a study pulls out of that home generally fall back to the older phase-down rates instead of 100%.
The flip side is genuinely useful. Anything you buy and install after the conversion, whether that’s furniture, appliances, a new HVAC system, fencing, or landscaping, is acquired after the cutoff and can qualify for the full 100% deduction. For a home you’re furnishing as a short-term rental anyway, that’s often where the largest first-year deduction comes from.
The 100% bonus depreciation you’ve read about probably doesn’t apply to the home you already own. The depreciation can apply to what you buy to furnish it.
An illustrative example
Say you bought your home years ago for $1.2 million and have since put $100,000 into improvements, giving you an adjusted basis of $1.3 million. The home is now worth $3 million.
Your depreciable basis isn’t $3 million. It’s the lower of adjusted basis or current value, so $1.3 million. Carve out the land, which we’ll assume is 25% of the basis, and you’re depreciating about $975,000 of structure.
A study that reclassifies 20% of that moves roughly $195,000 into five-, seven-, and 15-year categories. Because you bought the home before the OBBBA cutoff, that $195,000 gets written off over those shorter lives rather than all at once.
Then you furnish the home. Suppose you spend $150,000 on furniture, appliances, electronics, and outdoor equipment. All of it is acquired after the cutoff, all of it is short-life property, and it can be deducted in full in year one.
The first-year deduction here is real. Its shape is not what most people expect, though, because much of it comes from what you bought to furnish the home rather than from the home you already owned. That’s why this needs to be modeled with your specific numbers before you commit.
Key considerations and trade-offs
This isn’t a strategy for every homeowner. It tends to fit people who are near retirement, plan to relocate, own a highly appreciated home, have enough taxable income to absorb the deductions, and are willing to run a rental business for a couple of years.
You have to run it like a business. For the deductions to offset your other income rather than sit idle as suspended passive losses, the activity generally needs to avoid passive treatment. In practice that means average guest stays of seven days or less and material participation on your part, not handing the keys to a property manager and collecting checks. Keep a contemporaneous log of your hours. When these positions fail on audit, thin time records are usually the reason.
Deductions can be capped even when they’re allowed. The excess business loss rules limit how much net business loss you can use against nonbusiness income in a single year. For 2026, that threshold is $256,000 for single filers and $512,000 for joint filers. Anything above it carries forward rather than disappearing, but it doesn’t help you in the year you were counting on it.
Recapture comes at two different rates. Depreciation isn’t forgiven at sale. Under Section 121(d)(6), the exclusion doesn’t cover gain attributable to depreciation taken after May 6, 1997. Depreciation on the building comes back as unrecaptured Section 1250 gain at up to 25%. Depreciation on furnishings and fixtures comes back under Section 1245 at ordinary income rates, which can be higher. Recapture also applies to depreciation you were allowed to take, whether or not you claimed it.
Confirm you’re allowed to do this at all. A growing number of cities, counties, and homeowners associations restrict or prohibit short-term rentals, and many require permits and occupancy tax filings. Your mortgage may also carry an owner-occupancy clause. Check all of it before you plan around it.
Watch your own use of the house. If you stay in the home during the rental period, Section 280A can limit your deductions and complicate how the activity is classified. Personal nights carry a cost.
State taxes may not follow federal. Several states don’t conform to federal bonus depreciation, and some treat rental losses differently. Your state result can look very different from your federal one.
How it compares with the alternatives
The conversion strategy is one of several paths, and it isn’t automatically the best one.
Selling now. You claim Section 121 immediately, there’s no depreciation to recapture, and there’s no rental business to run. For many homeowners this is the right answer, and the conversion strategy has to beat it on an after-tax basis to justify the added complexity.
Holding the home for life. If your estate plan already points toward passing assets to heirs, holding the property until death can step up the basis and erase both the unrealized gain and the accumulated depreciation recapture. The conversion strategy can’t match that outcome, though holding means giving up the sale proceeds and the diversification they could fund.
A 1031 exchange. When the home is a rental, a 1031 exchange can defer gain on the rental portion by reinvesting in other qualifying property. Deferral isn’t exclusion, and recapture still follows the property, but it may be worth modeling if you want to stay in real estate.
How this fits your broader financial plan
The conversion strategy rarely stands alone. For families protecting and growing established wealth, this strategy sits at the intersection of several planning disciplines, and a tailored approach coordinates each one.
Tax planning: The timing of the conversion and the sale can be coordinated with your other tax moves. If you’re planning a Roth conversion in a lower-income year, depreciation deductions from the rental may offset some of that taxable income. Coordinating this takes a multiyear view, not a single filing season.
Investment management: Sale proceeds can be reinvested into a diversified portfolio aligned with your retirement goals. Rather than concentrating wealth in a single property, the sale may give you a chance to rebalance and improve your flexibility in retirement.
Estate planning: The timing of the sale and the use of the Section 121 exclusion can be coordinated with your estate plan, and the proceeds can be directed into trusts or gifting strategies. This is also where the hold-for-a-step-up alternative deserves a good look.
Insurance solutions: Operating a short-term rental introduces liability exposures that your homeowners policy probably doesn’t cover. A dedicated landlord or short-term rental policy may be required, and an umbrella policy can add another layer of protection for the wealth you’ve built.
Is this strategy right for you?
The conversion strategy rewards planning and punishes improvisation. It works best when your tax plan, investment strategy, estate plan, and insurance coverage all point the same direction.
Run the numbers before you act. That means modeling your depreciable basis, the deductions you can actually use this year, the recapture waiting at the other end, and your expected bracket in retirement.
If you’re near retirement, plan to relocate, and own a highly appreciated home, a conversation with your wealth advisor and a tax professional can help you decide whether this fits.
FAQs
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A cost segregation study is an engineering-based analysis that separates a rental property into its components, such as appliances, flooring, cabinetry, and landscaping, and moves them from the standard 27.5-year depreciation schedule into shorter five-, seven-, and 15-year recovery periods. Deductions arrive earlier, when they may be worth more. One caveat matters for converted homes: The 100% bonus depreciation restored by the One Big Beautiful Bill Act generally applies only to property acquired after Jan. 19, 2025, so the existing components of a home you bought years ago usually don’t qualify for it.
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The Section 121 exclusion lets eligible homeowners exclude up to $250,000 of gain, or $500,000 for certain married couples filing jointly, on the sale of a primary residence, provided you owned and used the home as your principal residence for at least two of the five years before the sale. Because the lookback runs five years, you generally have up to three years after moving out to sell and still qualify. You can’t use the exclusion more than once every two years, gain above the cap is taxable, and depreciation taken during a rental period can’t be excluded.
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A study for a residential property generally runs between $3,000 and $15,000. It tends to pencil out when your depreciable basis clears roughly $500,000, you’re in a high tax bracket, and you can actually use the deductions this year. Keep expectations realistic for a converted home, because the existing components usually don’t qualify for 100% bonus depreciation, while the furnishings you buy after the conversion often do.
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Less than most people expect. When you convert a residence to a rental, your depreciable basis is the lower of your adjusted basis or the home’s fair market value on the conversion date, and land is never depreciable. If you bought the property for $1.2 million and added $100,000 in improvements and the home is now worth $3 million, you depreciate from the $1.3 million adjusted basis minus the land portion, not from the $3 million.
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It may make sense to do so if you’re near retirement, plan to relocate, own a highly appreciated property, have enough taxable income to use the deductions, and are comfortable running a rental for a limited period. It also depends on rules that are easy to overlook: the cap on your depreciable basis, the bonus depreciation acquisition date, material participation, local short-term rental ordinances, and depreciation recapture at sale. A wealth advisor and a tax professional can help you model whether the numbers work.
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Not necessarily on your own, but to keep the deductions from being suspended as passive losses, you generally need average guest stays of seven days or less plus material participation in the activity. Handing everything to a property manager typically works against that. Keep a contemporaneous log of your hours, since documentation is where these positions most often fall apart under IRS review.
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Look for a fiduciary wealth advisor who coordinates tax planning, investment management, and estate planning and who can model the depreciation benefit, the recapture cost, and the timing constraints together. Mercer Advisors offers comprehensive planning that coordinates these disciplines, including tax services through Mercer Advisors Tax Services, LLC.
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Start with your city or county planning department, which typically publishes short-term rental ordinances, permit requirements, and occupancy tax rules. Then check your homeowners association covenants and your mortgage documents, since an owner-occupancy clause can restrict rental use even where local law permits it.
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You generally report recapture on Form 4797 and Schedule D. Depreciation on the building comes back as unrecaptured Section 1250 gain at a maximum rate of 25%, while depreciation on furnishings and fixtures is recaptured under Section 1245 at ordinary income rates. A qualified tax professional can handle the reporting and coordinate the sale with the rest of your tax picture.
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Section 121 excludes up to $250,000 of gain, or $500,000 for certain married couples filing jointly, on the sale of a primary residence, with no requirement to reinvest. A 1031 exchange defers gain on investment property by reinvesting in another qualifying property, so the tax is postponed rather than eliminated. The conversion strategy leans on Section 121 for the residence portion, and depreciation recapture applies either way.
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Selling directly lets you claim Section 121 right away with no recapture and no rental to run. Converting first adds depreciation deductions that can offset other income, but it also adds recapture at sale, active management, local rule compliance, and a three-year clock on the exclusion. Conversion may produce a better after-tax result for highly appreciated homes when the timing works, and it may not be worth the complexity otherwise.
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If passing assets to heirs is already part of your plan, holding the property until death can step up the basis and erase both the unrealized gain and the accumulated depreciation recapture. That’s a cleaner tax outcome than any version of the conversion strategy. The trade-off is liquidity and diversification, because the wealth stays tied up in one illiquid asset instead of funding your retirement income.
All expressions of opinion reflect the judgment of the author as of the date of publication and are subject to change. Some of the research and ratings shown in this presentation come from third parties that are not affiliated with Mercer Advisors. The information is believed to be accurate but is not guaranteed or warranted by Mercer Advisors. Content, research, tools and stock or option symbols are for educational and illustrative purposes only and do not imply a recommendation or solicitation to buy or sell a particular security or to engage in any particular investment strategy. All investing involves risk, including the possible loss of principal. Hypothetical examples are for illustrative purposes only.
Tax preparation and filing services are provided by Mercer Advisors Tax Services, LLC. Clients will sign a separate agreement when engaging Mercer Advisors Tax Services that defines the services provided and any additional fees that may apply.
For financial planning advice specific to your circumstances, talk to a qualified professional at Mercer Advisors.
