How to pay less taxes starts with a plan.

What the study changes

An engineering-based study separates a building into components. Certain assets may move from a 27.5-year residential or 39-year nonresidential recovery period into 5-, 7-, or 15-year classes. Appliances, carpet, furniture, fixtures, specialty equipment, landscaping, paving, fencing, outdoor lighting, and drainage may qualify depending on the facts. The building structure stays in its longer class.

Studies commonly report moving roughly 20%–30% of depreciable basis into shorter classes, but that is a planning range—not a promised result. Published study-cost estimates run about $5,000–$15,000 and vary by property and provider. A look-back study may capture missed depreciation through a §481(a) adjustment without amending prior returns.

The back end matters

Cost segregation accelerates deductions; it does not automatically erase tax. Short-life §1245 components can produce ordinary-income recapture at sale, while the building portion may create unrecaptured §1250 gain taxed at up to 25%. Model the holding period and exit before choosing the most aggressive first-year deduction.

Research basis: IRC §§168, 481(a), 1245 and 1250; see the KPMG real estate tax planning overview. Rate references: IRS 2026 inflation adjustments and SSA maximum taxable earnings. The illustration excludes California tax and other taxpayer-specific items. Property-specific engineering conclusions require a qualified study.

What qualifies

Both sides must be U.S. real property held for investment or productive use in a trade or business. Like-kind is broad—an apartment building can be exchanged for raw land or retail property—but personal residences, flip inventory, partnership interests, securities, and foreign real estate do not qualify.

The replacement must be identified in a signed writing delivered to the qualified intermediary by day 45. The common identification options are up to three properties of any value, any number whose combined value does not exceed 200% of the relinquished property, or any number if 95% of the identified value is ultimately acquired.

Full deferral and California follow-through

Full deferral generally requires reinvesting all net proceeds, acquiring equal-or-greater value, and replacing equal-or-greater debt. Cash retained or debt relief can create taxable “boot.” A California-property exchange into out-of-state property generally requires FTB Form 3840 in the exchange year and every later year while the California gain remains deferred. California real-property sales can also involve 3⅓% gross-price withholding under Form 593 unless an exemption or reduced-withholding rule applies.

California references: IPX1031 California clawback summary and Old Republic Exchange report. Confirm current Form 3840 and Form 593 filing mechanics with the FTB before closing.

Which property can qualify

Qualified MACRS property generally has a recovery period of 20 years or less. That includes many 5-, 7-, and 15-year components identified in a cost-segregation study; the 27.5- or 39-year building itself does not qualify. Used property may qualify when it was not previously used by the taxpayer or a predecessor and was not acquired from a related party.

The One Big Beautiful Bill Act, signed July 4, 2025, restored 100% federal bonus depreciation for qualified property acquired and placed in service after January 19, 2025. Property acquired on or before that cutoff remains under the earlier phase-down—40% for 2025, 20% for 2026, and 0% thereafter. Contract timing and placed-in-service evidence are therefore important.

Federal and California schedules split

California requires the federal bonus amount to be added back and the assets depreciated under California rules. Maintain a separate state depreciation schedule rather than assuming the federal deduction carries over.

Sources: KPMG and FTB Publication 1001 (2025). The January 19 cutoff mechanics should be checked against IRS Notice 2026-11 for the specific acquisition.

Why the status matters

Rental activities are generally passive under §469. A taxpayer who meets the real estate professional tests and materially participates may treat rental losses as nonpassive, allowing them to offset other income subject to basis, at-risk, and excess-business-loss limits.

Qualifying work includes development, redevelopment, construction, reconstruction, acquisition, conversion, rental, operation, management, leasing, or brokerage. Employee hours generally do not count unless the taxpayer owns more than 5% of the employer, and a spouse’s hours are not attributed for the 750-hour and 50% tests. A separate aggregation election may make rental-level material participation more workable.

Documentation is part of the strategy

Contemporaneous calendars, property-specific activity logs, emails, mileage records, and work-product evidence are stronger than reconstructed estimates. Qualification is tested every year; last year’s status does not carry forward automatically.

Source: Journal of Accountancy overview of passive-loss limits. Coordinate elections and audit-sensitive time-log positions with a CPA or tax attorney.

Two gates, not one

If average customer use is seven days or fewer, the activity is not treated as a rental activity for the passive-activity rules. The owner must still materially participate. Average stay is total rental days divided by separate guest stays for the year—not a seven-day cap on every reservation.

A property manager can make the more-than-anyone-else test difficult. Keep booking-platform reports, a daily rental log, and contemporaneous hours by person and task. Cost segregation and bonus depreciation may magnify a first-year loss, but basis, at-risk, and excess-business-loss limits still apply, and depreciation can be recaptured at sale.

Research basis: IRC §469, Reg. §§1.469-1T and 1.469-5T, and IRS Publication 925. Have a CPA or tax attorney review close calls involving managers or stays near the seven-day threshold.

Two regimes now need separate analysis

Legacy OZ investments made through December 31, 2026 defer eligible gain until the earlier of a disposition or December 31, 2026. Current research reports that IRS Notice 2026-40 measures the inclusion at the lesser of the originally deferred gain or the fair market value of the QOF interest. The investor may retain the interest and the path to the federal 10-year appreciation-exclusion election.

For gains invested on or after January 1, 2027, the permanent OZ 2.0 regime uses a rolling five-year deferral. A five-year hold can produce a 10% basis step-up, or 30% for a qualifying rural Opportunity Fund, and a 10-year hold can preserve the appreciation exclusion. Only the gain must be invested, unlike a full-deferral 1031 exchange.

Open item: the new map

The final tract list for the new decennial designations was not verified in the October 8, 2026 research. Confirm the applicable Treasury or CDFI Fund designation before presenting a particular property as eligible.

Sources: Cerity Partners on the 2026 inclusion and Windes on OZ 2.0. Confirm time-sensitive positions against IRS Notice 2026-40 and current Treasury designations.

Separate the property buckets

Cost-segregated 5- and 7-year components are typically §1245 property. Depreciation taken on those assets can come back as ordinary income when they are sold. The building is §1250 property; for post-1986 property, excess-over-straight-line recapture is usually zero, but the straight-line depreciation portion can still be taxed as unrecaptured §1250 gain at up to 25%.

Basis is reduced by depreciation allowed or allowable—even when a deduction was missed. A 1031 exchange may defer the gain and recapture, but it also carries the deferred tax attributes into replacement property.

Research basis: IRC §§1245 and 1250 and IRC §1(h). A sale with large accelerated deductions should be modeled before listing or entering an exchange agreement.

Compare the purpose, not only the deadline

A QOF partnership interest is not §1031 like-kind property, so an investor cannot directly exchange into an Opportunity Zone fund. A later taxable DST sale may generate gain that can be evaluated for OZ treatment. Typical DST offerings are limited to accredited investors, may have minimums around $100,000, and often contemplate a five- to ten-year hold, but every offering differs.

DST tax classification reference: Rev. Rul. 2004-86. Offering terms are not uniform; review the PPM with securities and tax counsel.

The account—not the person—owns the property

Self-directed retirement accounts may hold residential, multifamily, commercial, land, or farmland. All income and expenses must flow through the account. The owner cannot live there, perform paid work for it, pledge account assets, personally guarantee a loan, or transact with a disqualified person such as a spouse, ancestor, descendant, or a 50%-owned entity.

A prohibited IRA transaction can disqualify the entire IRA as of January 1 of the violation year, causing a deemed distribution and possible early-distribution penalty. A debt-financed IRA investment can also trigger unrelated debt-financed income tax. An eligible Solo 401(k) may receive the §514(c)(9) exception for leveraged real estate, but still remains subject to §4975.

For 2026, research citing IRS Notice 2025-67 reports a $24,500 employee deferral, an $8,000 age-50 catch-up, an $11,250 catch-up for ages 60–63, and a $72,000 overall annual-additions limit before catch-up. Eligibility generally requires a business with no full-time employees other than a spouse.

Source: NAPA Net prohibited-transaction overview. Obtain specialist review before any related-party or leveraged transaction.

Federal planning needs a second state model

California does not conform to federal §168(k) bonus depreciation, the increased federal §179 amounts, or the federal Opportunity Zone regime. Federal bonus depreciation is added back on Schedule CA, and a separate California depreciation schedule is maintained. The federal first-year benefit may therefore be much larger than the California benefit.

California taxes capital gains as ordinary income. The top 13.3% marginal rate includes the 1% Mental Health Services Tax on taxable income above $1 million. A California-to-out-of-state 1031 exchange does not make the California-source deferred gain disappear; Form 3840 generally follows that gain annually until recognition.

Proposition 19 and property-tax basis

Homeowners age 55 or older, qualifying disabled homeowners, and wildfire or disaster victims may transfer an eligible primary-residence base-year value to a replacement primary residence elsewhere in California under specified rules. Parent-child relief is much narrower: it generally applies only to a family home or family farm used as the child’s principal residence within one year and subject to a value cap. Rentals, vacation homes, and commercial property transferred to children are generally reassessed to market value.

Sources: FTB Publication 1001, EY on California conformity, and California BOE Prop 19 guidance.

What happens when appreciated property is inherited

Under current federal law, inherited property generally receives a new income-tax basis equal to fair market value at the owner’s date of death. That can eliminate the built-in capital gain and prior depreciation difference that existed during the owner’s life. If an heir later sells near that value, there may be little federal capital gain from the inherited appreciation; if the heir keeps renting it, depreciation generally begins again from the new allocated basis.

This is why some investors choose not to trigger a taxable sale. They collect rent year after year, deduct eligible expenses and depreciation, refinance when the economics make sense, and hold the property for life. No taxable sale during life generally means no sale-triggered capital-gain or depreciation-recapture tax during life.

It is powerful, but it is not automatic

The step-up generally applies at death, not to a lifetime gift. Estate tax, community-property rules, trusts, entity ownership, debt, foreign status, and special transactions can change the result. Tax law can also change over a long holding period. A property should still be a good investment after maintenance, vacancies, financing, insurance, and management costs.

Research basis: IRC §1014. The basis adjustment depends on the law and ownership facts in effect at death; coordinate tax and estate-planning advice before changing title or gifting property.

A simple long-range roadmap

Years 1–3: buy a property that works as an investment before tax benefits. Set up separate books, collect Form 1098 and expense records, establish the correct basis, and consider a qualified cost-segregation study. If the participation and loss-limit rules allow it, accelerated depreciation may lower current taxable income.

Years 4–7: operate the rental well. Raise income thoughtfully, control expenses, maintain reserves, update improvement and depreciation schedules, and decide whether available cash and equity support another purchase. Repeat the analysis on each new property rather than copying the first plan.

Years 8–15: manage the portfolio as a system. Some properties may keep producing income, some may support a 1031 exchange, and others may be long-term holds. Review debt, insurance, title, estate planning, suspended losses, and likely recapture every year. The goal is dependable rental income with a tax plan that can survive changes in life and law.

Make the tax savings work

Tax savings are most useful when they strengthen the plan: building reserves, reducing costly debt, funding the next down payment, improving a property, or adding another sound income-producing asset. The objective is not to buy something merely to create a deduction. It is to keep more after-tax capital working for you—legally and deliberately.