Bonus Depreciation and Rental Property: What Investors Should Model

Model the usable tax effect, study and reporting costs, operating cash and eventual sale together. A large first year deduction can be valuable, but it should not become the reason to accept a weak rental or a mortgage payment the property cannot support.

What can qualify after cost segregation?

A cost segregation study may identify eligible personal property or land improvements separately from the building. Bonus depreciation can apply to certain qualifying property, including eligible MACRS assets with recovery periods of twenty years or less, subject to the requirements and exclusions. ^[1]

Land is not depreciable, and an ordinary rental building's long recovery period is a different category. A study must support the classification of actual costs. A percentage estimate is not a conclusion that every asset in that group qualifies.

Appliances, fixtures and site improvements need asset specific analysis. Used property also has eligibility requirements. Give the CPA the purchase history, seller relationship and other relevant facts rather than assuming a newly acquired used asset is automatically accepted.

The cost segregation guide addresses whether to order the study. This page concerns the modeling decision after the eligible assets and basis have been identified.

Current percentages require more than a tax year label

As reviewed in October 2026, current law provides a permanent 100% additional first year deduction for qualifying property acquired and placed in service after January 19, 2025, subject to applicable rules. IRS Notice 2026 11 explains interim implementation and acquisition date treatment. ^[2]

That does not mean every asset put into service in 2026 receives 100%. Property subject to earlier acquisition rules can remain under the former phase down. IRS Revenue Procedure 2026 15 explains the general 20% percentage for covered property acquired after September 27, 2017 and before January 20, 2025, then placed in service during 2026. ^[3]

There are special categories, elections and date rules. For example, IRS guidance describes a transitional election for the first tax year ending after January 19, 2025. ^[2] Your CPA should identify the applicable rule rather than use a universal calendar year chart.

A binding contract or construction arrangement can affect the acquisition analysis. The closing date, invoice date and date a study is completed are not necessarily interchangeable. Have the adviser review the actual contracts and facts before selecting the percentage.

Model three separate results

First calculate the deduction generated under the accepted asset schedule and applicable election. Then determine what is usable under the owner's limitations. Finally calculate when an actual reduction in taxes would affect available cash.

A deduction is not a dollar for dollar credit. Its tax effect depends on the owner's rates and circumstances. An estimated reduction in liability also does not mean a refund arrives on the study's delivery date.

IRS rental guidance describes at risk and passive activity limits and other potentially relevant loss limitations. ^[4] A deduction can be generated while its current use is restricted. A short term rental label alone does not establish that a loss offsets wages or another business's income.

Ask the CPA for a usable benefit estimate and the assumptions supporting it. If the answer depends on participation, other income or entity basis, provide those records before treating the projected benefit as part of your investment budget.

Tax reporting and cash flow are different views

Keep the property's operating statement independent of the tax schedule. The rental numbers guide helps evaluate income, expenses, vacancy and debt without using a tax deduction as rent.

A hypothetical first year model

Assume the CPA identifies $80,000 of eligible component basis and confirms 100% bonus treatment for those assets under the actual rules. For this illustration, assume the incremental deduction compared with the chosen baseline is $72,000 after accounting for deductions otherwise available.

At an assumed 32% marginal rate, if the entire incremental deduction is currently usable at that rate, the simplified tax reduction is $23,040. Assume the study and implementation cost $5,000 in cash. The immediate difference is $18,040 before other taxes, timing, later consequences and the tax treatment of those fees.

The model needs the incremental $72,000, not simply the $80,000 gross component figure. The baseline would generally have included some recovery; counting all $80,000 as an additional benefit would overstate the comparison under these assumptions.

Now assume only $20,000 of the incremental deduction is currently usable. At the same assumed rate, the simplified current reduction is $6,400. After the $5,000 cash cost, only $1,400 of immediate difference remains. The rest of the deduction needs separate future analysis rather than being called current cash savings.

These are teaching assumptions, not a projected refund or personal tax calculation. Have the CPA determine the actual schedule and limitations.

Stress test the property without the tax benefit

Suppose the same rental's annual cash after the operating expenses and debt payments in your budget is $12,000. An additional $8,000 repair would leave $4,000 before other investor costs.

The property's cash position does not improve simply because the tax return shows a larger depreciation loss. Any usable tax reduction may help the owner's broader finances, but it arrives through a different mechanism and timing.

Ask whether the rental still works if the deduction is suspended, the tax rate is lower than assumed or the investor sells sooner than expected. If financing depends on receiving a specific refund before a deadline, have both advisers review the cash plan and accepted source documentation.

Do not count expected tax savings as verified closing funds or reserves without the lender's acceptance and the required evidence. A forecast is different from accessible money.

Mortgage qualification needs its own calculation

A reported rental loss does not automatically mean a borrower cannot qualify. Some conventional calculations permit specified depreciation adjustments, while a DSCR program may use accepted property income and housing cost. The loan route, documentation and other liabilities still matter.

The existing depreciation and mortgage qualification guide covers that analysis. Do not assume every accelerated deduction receives the same treatment across lenders, or that a lender's adjustment changes the tax return itself.

Give the loan officer the filed return, depreciation schedule and supporting information requested for the transaction. Keep the preparer and lender aligned on what the documents show. Accurate tax reporting should not be altered to manufacture qualifying income.

Include the sale and holding period

Accelerated depreciation can reduce adjusted basis and affect later gain treatment. Different components can have different consequences. IRS disposition guidance addresses depreciation recapture and unrecaptured section 1250 gain rather than applying one rate to every asset. ^[5]

Model an early sale as well as the planned long hold. Receiving a benefit earlier can still have value, but fees, future tax rates and the timing of later gain can change that value.

A 1031 exchange requires its own analysis. Do not presume it eliminates all tax effects of every asset identified through a study. For the exit discussion, use the rental depreciation recapture guide.

If the plan is to refinance instead of sell, compare payment, costs and retained risk using the sell or refinance guide. A refinance can change debt and liquidity without producing the same event as a sale, but it does not make operating expenses disappear.

Questions to put to the CPA

Before authorizing the study or election, ask:

• Which specific assets and basis qualify, and which remain building or land?

• What acquisition and service dates apply, including contracts and construction?

• Which current percentage, elections or exclusions govern this tax year?

• How much incremental deduction is usable now under my circumstances?

• What state or other filing differences affect the estimate?

• How do fees, implementation and a shorter hold change the result?

• What happens to basis and gain if I sell or exchange?

• Which records should be retained, and who maintains the final schedule?

Ask for a side by side baseline and accelerated case. A useful recommendation should identify assumptions and uncertainty rather than merely repeat the largest possible deduction.

Preserve the asset history

• Acquisition agreements, closing statements, cost and land allocations.

• Study reports, asset schedules, invoices and placed in service evidence.

• Elections, filed returns and applicable method change records.

• Subsequent improvements and asset disposition records.

The financing file should separately preserve the actual rents, expenses, loan terms, cash paid and reserve balances. Those records explain the investment's cash performance even when tax depreciation changes substantially.

Tax advice boundary: The CPA determines asset eligibility, elections, loss use and reporting. A mortgage adviser can explain loan documentation and financing choices but cannot promise a deduction, refund or tax classification for the property.

Treat bonus depreciation as a timing and eligibility decision within a complete investment model. If the deal remains affordable without the hoped for tax reduction, you can evaluate the tax opportunity without making the property's survival depend on it.