Tenant improvements bonus depreciation lets property owners immediately write off most or all renovation costs instead of waiting 39 years. With the One Big Beautiful Bill Act permanently restoring 100% bonus depreciation for qualified improvement property placed in service after January 19, 2025, savvy investors can now turn tenant buildouts into instant tax savings.
Key Takeaways
- 100% bonus depreciation is back permanently for tenant improvements placed in service after January 19, 2025
- Interior improvements now qualify for immediate write-offs instead of 39-year depreciation
- Cost segregation studies can reclassify 25-45% of improvements into even shorter 5-year categories
- State tax treatment varies significantlyâsome states don’t conform to federal bonus rules
- Professional cost segregation firms help maximize deductions while maintaining IRS compliance
What Makes Tenant Improvements Eligible for Accelerated Depreciation
Picture this. You just spent $300,000 renovating your commercial building for a new tenant. Your CPA tells you the deduction gets spread over 39 years. That’s less than $8,000 per year.
Now imagine writing off the entire $300,000 this year.
That’s the power of understanding how tenant improvements bonus depreciation actually works. The secret lies in something called Qualified Improvement Property (QIP). When the Tax Cuts and Jobs Act passed in 2017, Congress tried to give property owners a massive tax break. They messed up the language. For two years, nobody could figure out if tenant improvements qualified for bonus depreciation.
The CARES Act fixed that mistake in 2020. Then the One Big Beautiful Bill Act made it permanent in 2025.
Here’s what qualifies. The Internal Revenue Service says QIP must be interior improvements to nonresidential property. The building has to already be in service. You can’t claim bonus depreciation on brand-new constructionâonly on improvements made after someone’s already using the building.
What Counts as Qualified Improvement Property
Walk into any renovated office space. Look around. Most of what you see probably qualifies. Interior doors. Drywall partitions. Dropped ceilings. Electrical and plumbing systems serving the interior. HVAC ductwork inside the building. Flooring that’s real property. Fire protection systems. Security systems.
One of my clients ran a medical office. They spent $180,000 on custom exam rooms. Every cabinet, every sink, every piece of specialized lighting counted as QIP. They wrote off $180,000 in year one instead of spreading it over decades.
What Gets Excluded from QIP Treatment
The IRS draws clear lines about what doesn’t qualify. Building enlargementsâadding square footageâthat’s out. Elevators and escalators. The internal structural framework. Load-bearing walls, columns, and girders that hold the building up.
Exterior stuff doesn’t count either. New roof? Not QIP. Facade improvements? Nope. Windows and exterior doors? Sorry. The rooftop HVAC unit sitting outside? That’s excluded too, even though the ductwork inside qualifies.
This is where people make expensive mistakes. They lump everything together and miss opportunities. Or worse, they claim things that don’t qualify and get hammered in an audit.
The New Permanent 100% Bonus Depreciation Rules
Before January 2025, bonus depreciation was dying a slow death. It dropped to 80% in 2023. Then 60% in 2024. The plan was 40% in 2025, 20% in 2026, and gone by 2027.
The One Big Beautiful Bill Act changed everything. For property placed in service after January 19, 2025, you get 100% bonus depreciation again. And this time it’s permanentânot scheduled to phase out.
| Placed in Service Date | Bonus Depreciation Rate | Recovery Period |
|---|---|---|
| 2018-2022 | 100% | 15 years |
| 2023 | 80% | 15 years |
| 2024 | 60% | 15 years |
| Jan 1-18, 2025 | 40% | 15 years |
| Jan 19, 2025 onward | 100% (Permanent) | 15 years |
That January 19 date matters. If you finished your tenant improvements on January 18, you only get 40% bonus. Wait one more day and you get 100%. Timing matters a lot in tax planning.
How the Phase-Out Schedule Impacted Property Owners
From 2023 to early 2025, property owners faced tough decisions. Do you rush construction to beat the declining rates? Or wait and hope Congress extends the benefit?
Smart investors understood the time value of money. Getting 80% in 2023 was better than waiting for potential 100% that might never come. Taking the deduction earlier meant more present value, even at a lower percentage.
Now that calculation is simple. Do the improvements. Take the deduction. Move on.
Understanding the 15-Year Recovery Period
Even without bonus depreciation, QIP gets a huge advantage. Normal commercial real estate uses a 39-year recovery period. QIP uses 15 years.
Run the math. On a $100,000 improvement, 39-year straight-line depreciation gives you $2,564 per year. At 15 years, you get $6,667 annually. That’s more than double the annual deduction.
When you layer 100% bonus depreciation on top, you accelerate all those future deductions into year one. The time value is enormous. A dollar saved in taxes today is worth more than a dollar saved in 10 years. Inflation erodes that future value. Your cost of capital matters too.
Reclassification Through Cost Segregation
Here’s where it gets interesting. Not everything in a tenant improvement project has to be 15-year property. A cost segregation study identifies components that qualify for even shorter lives.
Personal property like furniture and fixtures? That’s 7-year property. Specialized equipment? Often 5-year. Carpeting installed with strippable adhesive? 5-year. Decorative lighting fixtures? 7-year.
Most tenant improvement projects contain 25-45% of costs that can be reclassified to 5 or 7-year property. That matters because even at 100% bonus, getting the classification right protects you in an audit.
A retail buildout I worked on had $400,000 in improvements. The CPA recorded it all as QIP. Simple. Clean. Wrong. A cost segregation study found $140,000 that should’ve been 5-year property. Same deduction timing with 100% bonus, but proper classification matters for future depreciation if the bonus rate ever changes again.
5 Critical Points Every Property Owner Must Know
- Timing is everything: The placed-in-service date determines your bonus rate, not when you signed the lease or started construction
- Documentation protects you: Keep detailed invoices separating QIP from excluded costs like structural work and enlargements
- State conformity varies wildly: Your federal deduction doesn’t guarantee state tax benefitsâCalifornia, for example, doesn’t conform to most federal bonus rules
- The real property trade or business election kills bonus: If you elected out of interest limitations under Section 163(j), you can’t use bonus depreciation on QIP
- Cost segregation amplifies benefits: Even with 100% bonus, proper asset classification provides audit protection and captures missed opportunities
How Federal, State, and Local Laws Impact Your Deductions
Federal tax law is just the starting point. What happens at the state level can surprise you.
About half the states use “rolling conformity.” They automatically adopt federal tax code changes. When Congress restored 100% bonus depreciation, those states got it too. The other half use “fixed-date conformity.” They lock into the Internal Revenue Code as of a specific date.
California conforms to January 1, 2015 tax law. They never adopted the TCJA changes. They don’t recognize QIP’s 15-year life. California property owners must add back federal bonus depreciation and use 39-year depreciation for state returns.
That creates planning headaches. You get a massive federal deduction but pay more state tax. In a high-tax state, that matters.
State-by-State Conformity Challenges
Massachusetts allows the 15-year QIP life but requires addbacks for bonus depreciation. Tennessee follows the same pattern. Wisconsin updated their conformity specifically for QIP but not for other TCJA provisions.
Georgia adopted 15-year depreciation for QIP after 2018 but doesn’t allow bonus. Iowa treats QIP as 39-year property for tax years 2018 and 2019. Connecticut decoupled from bonus while keeping the shorter recovery period.
This creates compliance nightmares. Your tax preparer needs to track federal basis separately from state basis. When you eventually sell the property, those basis differences matter. You might trigger state recapture even when the federal transaction qualifies for like-kind exchange treatment.
Local Property Tax Considerations
Don’t forget local assessors. Accelerated depreciation for income tax doesn’t change property tax valuations, but major tenant improvements might trigger reassessment.
Some jurisdictions assess tenant improvements separately from base building value. Others include it all together. The tax treatment on your income tax return has nothing to do with the assessor’s valuation methods, but the improvements themselves definitely show up on their radar.
Smart property owners coordinate with their tax advisors before major renovation projects. You want to understand the full tax pictureâfederal, state, and localâbefore you commit capital.
Section 179 vs. Bonus Depreciation for Tenant Improvements
Section 179 offers another path to immediate expensing. For 2025, you can expense up to $1.22 million in qualifying property. But there are crucial differences.
| Feature | Section 179 | Bonus Depreciation |
|---|---|---|
| Dollar Limit | $1.22 million (2025) | Unlimited |
| Can Create Loss | No | Yes |
| Eligible Property | HVAC, security, fire, roofing | Broader QIP definition |
| Phase-Out | Begins at $3.05 million | No phase-out |
| State Conformity | Often better | Many states decouple |
Section 179 can’t create a tax loss. Bonus depreciation can. If you have other income to offset, bonus depreciation might work better. If you’re barely profitable, Section 179 lets you expense up to your income limit.
Some property qualifies for Section 179 but not QIP. Roofing improvements, for example. HVAC units on the exterior. Security systems. These can be immediately expensed under Section 179 even though they’re not interior improvements.
The smart play? Use both. Maximize Section 179 on property that doesn’t qualify for QIP. Use bonus depreciation on everything else.
When Lease Agreements Complicate Ownership
Who gets the deduction depends on who owns the improvements. That’s not always obvious.
Tenant makes improvements, pays for them, keeps them? Tenant depreciates them. Easy. Landlord constructs improvements, owns them? Landlord depreciates them. Still simple.
The messy cases happen when the tenant makes improvements but the lease agreements treat them as rent substitution. The landlord must recognize rental income. The tenant amortizes the payment over the lease term. Nobody gets accelerated depreciation. That’s the worst outcome.
Tax advisors need to review lease language before construction starts. Small changes in how the lease describes tenant allowances can swing hundreds of thousands in deductions from one party to another.
Real-World Case Studies
Medical Office Conversion: A physician group spent $650,000 renovating 12,000 square feet in Austin, Texas. Cost segregation identified $300,000 in 5 and 15-year property, generating $195,000 in first-year tax savings at their marginal rate.
Retail Strip Mall: An investor owned a strip center with a departing restaurant tenant who left behind $275,000 in custom improvements. Without clear cost records, a forensic cost segregation study reconstructed the improvements and captured previously missed deductions through an accounting method change.
Gym Facilities: Four gym locations totaling $1.8 million in tenant improvements saw 82-92% reclassified for accelerated depreciation, with 100% bonus depreciation applied to the eligible components in the year placed in service.
Why Professional Cost Segregation Firms Matter
As tax attorney and cost segregation expert Steven Barnes from Wipfli notes, “With the return of 100% bonus depreciation in 2025, you have a valuable opportunity to significantly reduce your taxable income by fully expensing the cost of eligible assets in the year they’re placed in service.”
Anybody can call improvements QIP and take 100% bonus. Not everybody can defend it in an audit. The IRS Cost Segregation Audit Techniques Guide runs over 200 pages. They know exactly what to look for.
Professional firms bring engineers and tax specialists together. They review architectural drawings, construction invoices, and building systems. They separate QIP from non-QIP. They identify 5 and 7-year property within the overall improvement cost.
The documentation matters as much as the tax savings. When you work with a qualified cost segregation firm, you get detailed engineering reports that show exactly how each dollar was classified. That’s what survives an audit.
Most firms won’t touch projects under $200,000. The cost of a quality study runs $5,000 to $15,000 depending on complexity. Below certain thresholds, the juice isn’t worth the squeeze. But for substantial improvements, the return on investment is often 10 to 1 or better.
Timing matters too. The best studies happen during construction, not two years later. Engineers can visit the site, photograph components before they’re enclosed, and gather documentation in real-time. Retroactive studies work, but they’re harder and more expensive.
Take Control of Your Tax Strategy Today
The permanent restoration of 100% bonus depreciation for tenant improvements creates a rare opportunity. Property owners who understand these rules and execute properly can transform renovation projects from slow depreciating assets into immediate tax savings.
Don’t leave money on the table. Every dollar you overpay in taxes is a dollar that could’ve grown your business. Review your recent improvement projects. If you completed work in 2023 or 2024, you might be able to file amended returns or accounting method changes to claim missed deductions.
For projects coming up, build tax planning into your process from day one. Talk to your CPA before you sign construction contracts. Consider engaging a cost segregation firm early. The investment in proper planning pays for itself many times over.
Tenant Improvements Bonus Depreciation FAQs
Can I claim bonus depreciation on tenant improvements in buildings I already own?
Yes, you can claim bonus depreciation on tenant improvements made to buildings you already own, as long as the improvements are placed in service after the building was first placed in service. The building doesn’t have to be newâjust the improvements. This makes QIP particularly valuable for existing property owners doing renovations, tenant buildouts, or repositioning projects.
What happens if I elected out of the Section 163(j) interest limitation?
If you made the real property trade or business election to opt out of the interest expense limitation under Section 163(j), your QIP must use a 20-year Alternative Depreciation System life and is not eligible for bonus depreciation. You can withdraw this election on an amended return, but timing rules and recalculations make this complex, so consult your tax advisor about whether it makes sense.
Do tenant improvements bonus depreciation rules apply to residential rental property?
Generally noâQIP applies to nonresidential real property only. Residential rental property improvements follow different rules with a 27.5-year depreciation life. There’s a limited exception for residential property used as short-term rentals, where some courts have found the property may qualify as nonresidential, but this area remains unsettled and risky.
How does the One Big Beautiful Bill Act change tenant improvements bonus depreciation?
The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualified property placed in service after January 19, 2025, eliminating the phase-out schedule that was reducing the bonus by 20% each year. This means tenant improvements that qualify as QIP can now be fully deducted in year one indefinitely, providing long-term certainty for tax planning.
Can I use both Section 179 and bonus depreciation on the same project?
Yes, you can combine Section 179 expensing with bonus depreciation on the same improvement project, but not on the same assets. The strategy is to use Section 179 for property that qualifies under Section 179 rules but not QIP (like roofing or exterior HVAC units), then apply bonus depreciation to the remaining QIP-eligible interior improvements. This maximizes your immediate deductions across all components.
Citations
- CSSI Services. Leasehold Improvements Depreciation & Its Tax Benefits
- Grassi Advisors. Tax Reform for Real Estate: What the One Big Beautiful Bill Means for Your Business
- Wipfli. Steven A. Barnes. What are the new rules for 100% bonus deduction in 2025
- Bloomberg Tax. Qualified Improvement Property
- Colliers. Current Tax Treatment For Tenant Improvements
- EisnerAmper. What Is Qualified Improvement Property (QIP)?
- Baker Tilly. IRS issues guidance on bonus depreciation for qualified improvement property
- MSC Tax. Understanding Qualified Improvement Property (QIP): A Guide for Real Estate Owners and CPAs
Paul Kohn MBA is a seasoned business consultant known for helping businesses maximize tax credits and incentives to fuel growth and profitability. He holds a Master’s in Business Administration and has helped numerous companies secure millions in tax credits and implement effective business strategies. He is regarded as a trusted authority for business owners seeking to optimize their savings and growth.
