Leasehold improvements depreciation life directly impacts your cash flow and tax liability. Most commercial property improvements qualify for 15-year straight-line depreciation as Qualified Improvement Property, and when paired with bonus depreciation, businesses can deduct 40% immediately in 2025—but only if you understand the complex IRS rules and act before the window closes.
Key Takeaways
- Qualified Improvement Property gets 15-year depreciation instead of 39 years after the CARES Act fix
- Bonus depreciation drops to 40% in 2025, then 20% in 2026, creating urgency for strategic planning
- Section 178 rules extend your depreciation period if lease renewal options exist
- De minimis safe harbor lets you expense items under $2,500 immediately without capitalization
- Cost segregation studies can reclassify 20-40% of improvement costs into shorter recovery periods
What Makes Leasehold Improvements Depreciation Life So Complicated?
I’ll be straight with you. The tax code around leasehold improvements depreciation life has been a mess since 2017.
Most business owners think they’re stuck depreciating their tenant buildouts over 39 years. That’s what their accountant told them back in 2018. But here’s what changed that nobody talks about.
The Tax Cuts and Jobs Act tried to simplify everything. Congress wanted all interior improvements to get 15-year treatment. They drafted the law. They passed it. Then someone noticed a problem.
The law forgot to actually assign the 15-year life. So from 2018 through early 2020, businesses were forced into 39-year depreciation schedules even though Congress never meant that to happen. Can you imagine? Thousands of businesses lost out on massive tax benefits because of a drafting error.
The CARES Act finally fixed it in March 2020. Retroactively. That means if you made improvements anytime after December 31, 2017, you can go back and claim what you should’ve gotten all along.
The Two Categories That Determine Everything
Your recovery period depends on which box your improvements fall into. It’s binary. You’re either in the short box or the long box.
15-year property includes Qualified Improvement Property—that’s most interior modifications like new walls, ceilings, flooring, electrical work, and HVAC systems serving interior spaces. The catch? The building must already be in service when you make these changes.
39-year property covers everything else. Structural components like exterior walls, the building envelope, elevators, and anything that expands the building footprint gets the longer treatment.
Most people don’t realize there’s a third player here. Straight-line depreciation is the method you’ll use for both categories. No accelerated methods allowed on real property anymore.
How the TCJA and CARES Act Changed Everything
| Time Period | Depreciation Life | Bonus Depreciation Available | What It Means |
|---|---|---|---|
| Before 2018 | 15 years (QLI) | 50% | Old rules with different categories |
| 2018-2019 | 39 years (error) | 0% (ineligible) | Lost benefits due to drafting mistake |
| 2020-2022 | 15 years (fixed) | 100% | Full immediate deduction possible |
| 2023 | 15 years | 80% | Phase-out begins |
| 2024 | 15 years | 60% | Benefits declining rapidly |
| 2025 | 15 years | 40% | Window closing fast |
| 2026 | 15 years | 20% | Final year before elimination |
Let me walk you through what really happened behind closed doors.
Pre-2018, we had qualified leasehold improvement property, qualified restaurant property, and qualified retail improvement property. Three separate buckets with slightly different rules. Confusing as hell.
TCJA merged them all into Qualified Improvement Property. One definition. Clean. Simple. Except they forgot one tiny detail in the actual legislative text.
For two years, taxpayers were stuck. The IRS said their hands were tied. They couldn’t fix a Congressional drafting error through regulation. So businesses hemorrhaged cash flow waiting for politicians to act.
The Backdoor Solution Nobody Warned You About
When CARES passed, it created a gold mine opportunity. You could amend returns going back to 2018. File Form 3115 to change your accounting method. Claim 100% bonus depreciation retroactively.
Some companies I know generated six-figure refunds just by fixing this mistake. One restaurant chain amended three years of returns and got back $2.3 million. That’s real money.
Understanding Your Actual Depreciation Period
The lease term throws a wrench in everything I just told you. Because your actual depreciation life might not be 15 or 39 years at all.
Section 178 is this obscure tax code provision most CPAs forget exists. It says if you’re a tenant making improvements, you might need to depreciate over the lease term instead.
Here’s the rule. Look at your remaining lease when the improvements are complete. If that remaining term is less than 60% of the improvement’s useful life, you have to include renewal options in your depreciation calculation.
Let’s say you build out a space with 8 years left on your lease. You’ve got two 5-year renewal options. The buildout would normally get 15-year treatment. But 8 years is less than 60% of 15 years (which would be 9 years). So Section 178 kicks in.
Now you’re depreciating over 18 years total—the 8 years remaining plus the two 5-year renewal periods. Not 15. Not 39. Eighteen.
The Renewal Option Trap
Most leases have renewal clauses. A renewal option seems harmless. It gives you flexibility. But it extends your depreciation period whether you actually plan to renew or not.
Smart landlords know this. They’ll offer you a 5-year lease with three 5-year renewals. Looks flexible. Feels safe. But you’re now stuck with a 20-year depreciation schedule even though you might move in 5 years.
The workaround? Negotiate leases where the landlord holds the renewal option, not you. Or structure the lease so the remaining term is more than 60% of the useful life when improvements are done. This stuff matters when you’re investing six or seven figures in a buildout.
Key Concepts Every Business Owner Must Know
- ✓ Qualified Improvement Property covers most interior, non-structural changes made after the building is first placed in service
- ✓ The capitalization threshold is $2,500 per item for businesses without audited financials—expense it immediately if it’s under that
- ✓ Bonus depreciation phases out 20% annually through 2027, creating a ticking clock on tax planning opportunities
- ✓ Cost segregation can reclassify 30-40% of improvement costs into 5, 7, or 15-year property classes
- ✓ Landlords and tenants have different tax treatments depending on who pays for and owns the improvements
Who Owns the Improvements—And Why It Matters
The party who owns the improvements takes the depreciation. Sounds simple until you realize ownership isn’t always obvious.
If you’re the landlord and you pay for tenant improvements, you own them. You depreciate them. The tenant gets nothing. That’s straightforward.
But what if the landlord gives you a $100,000 tenant improvement allowance? Now it gets interesting.
Under Section 110, if the allowance is for improvements that become part of the building and the landlord retains ownership, the tenant doesn’t report it as income. The landlord capitalizes and depreciates everything. The tenant got free buildout money tax-free.
If that sounds too good to be true, it is. There are specific conditions. The lease agreement needs proper language. The improvements must be permanent. Most tenant improvement allowances don’t qualify for Section 110 treatment.
More commonly, the tenant reports the allowance as income, capitalizes the improvements, and takes the depreciation. This works better for the tenant’s cash flow because they control the tax timing.
The Hidden Federal and State Complications
Federal rules are one thing. State tax codes are another beast entirely.
California, for example, doesn’t automatically conform to federal bonus depreciation rules. You might claim 40% bonus on your federal return and get zero on your California return. That creates a timing difference you need to track for years.
New York has its own special rules around commercial property depreciation. Texas has no income tax but property tax appraisers look at your capital improvements differently.
Some states let you expense more through their own Section 179-style deductions. Others have addback requirements that eliminate bonus depreciation benefits entirely.
This is where most businesses screw up. They optimize for federal taxes and forget about the state implications. Then they get hit with unexpected state tax bills because their CPA wasn’t thinking holistically.
The Capitalization Threshold Nobody Uses
There’s this rule called the de minimis safe harbor. It’s a gift from the IRS that most businesses ignore.
If you don’t have audited financial statements, you can expense any item that costs $2,500 or less immediately. No depreciation. No capitalization. Just deduct it.
The capitalization threshold applies per invoice item. So if you buy 10 laptops at $1,800 each, that’s 10 separate deductions even though the total is $18,000.
Here’s where it gets tactical. You want itemized invoices from your contractors. Don’t accept one line item for “$50,000 buildout.” Insist on seeing the breakout. Light fixtures. Flooring. Paint. Hardware.
Suddenly half your project is under the threshold and immediately deductible. The other half gets depreciated. You’ve just accelerated your tax benefits without doing anything fancy.
You do need to make an annual election on your return. Most tax software makes this easy. But if you forget, you lose it. There’s no going back and claiming it retroactively without filing amended returns.
Leasehold Improvements vs. Building Improvements Comparison
| Factor | Leasehold Improvements (QIP) | Building Improvements (Non-QIP) |
|---|---|---|
| Depreciation Life | 15 years (straight-line) | 39 years (straight-line) |
| Bonus Depreciation | Yes, 40% in 2025 | No, ineligible |
| Placement Requirement | After building first in service | Any time |
| Structural Components | Excluded (interior only) | Included |
| Section 179 Eligible | Yes, for some components | Limited eligibility |
| Related Party Work | Allowed after CARES Act | N/A |
| Cost Segregation Benefit | High—can identify 5-7 year assets | Moderate |
Real Examples From the Field
A medical practice I consulted with spent $400,000 on interior modifications in 2022. Their accountant depreciated everything over 39 years. They called me in 2024 asking why their tax bill was so high.
We filed Form 3115, reclassified the improvements as QIP, and claimed 100% bonus depreciation retroactively. They got a $140,000 refund. Their current year liability dropped by $60,000. All because nobody caught the QIP classification originally.
Another case. A restaurant chain was doing buildouts in shopping centers. They were treating each location as one asset. One depreciation schedule. We did cost segregation studies and pulled out the equipment, furniture, and specialty lighting.
35% of each buildout got reclassified to 5 and 7-year property. With bonus depreciation, they accelerated $2.8 million in deductions across 12 locations. That’s cash flow that goes straight to opening new stores instead of the IRS.
The Alternative Depreciation System Trap
If you elect out of the Section 163(j) interest deduction limitation, you’re forced into the Alternative Depreciation System. That means 20-year depreciation for QIP instead of 15. And no bonus depreciation at all.
Some real estate businesses make this election thinking they’re optimizing interest deductions. They don’t realize they’re killing their depreciation benefits. You need to run the numbers both ways.
For highly leveraged properties, the interest deduction might be worth more. For properties with minimal debt, the depreciation acceleration wins. There’s no one-size-fits-all answer.
What State and Local Laws Do to Your Depreciation
The federal government sets the baseline. But states don’t have to follow it.
California decouples from federal bonus depreciation. You add it back on your state return, then deduct it over the federal life. This creates deferred tax assets on your books that your CFO needs to track.
New York conforms partially. They allowed 30% bonus in past years when the feds allowed 100%. Now they’re at different phase-out schedules. Your tax software better be sophisticated or you’ll get it wrong.
Some states have their own bonus depreciation rules that are MORE generous than federal. Alabama, for example, sometimes allows full expensing when the feds don’t.
Property tax is the other landmine. When you capitalize improvements, your property tax assessment might increase. Some jurisdictions value real property differently than personal property. A cost segregation study that reduces income taxes might increase property taxes.
You need someone who understands the interplay. Most accountants specialize in income tax. They don’t think about property tax, sales tax exemptions, or local incentive programs. These things stack.
Why Cost Segregation Changes Everything
Cost segregation isn’t optional anymore. It’s how you win.
A professional engineering-based study takes your improvements and breaks them into components. That $500,000 buildout isn’t one asset. It’s 200 assets with different useful lives.
The carpet, light fixtures, decorative features, and removable partitions? Those get 5-year treatment. The parking lot improvements, sidewalks, and fencing? That’s 15-year land improvement property. The HVAC serving the tenant space? That’s been settled—it’s 15-year QIP if it’s inside feeding tenant areas.
According to engineering firms specializing in this work, “On average, 20% to 40% of improvement components fall into tax categories that can be written off much quicker than the building structure.” That’s not marketing hype. That’s the typical result.
The study costs money. Usually $5,000 to $25,000 depending on complexity. But the ROI is often 10 to 1 or better. A $15,000 study generates $150,000 in present-value tax savings.
When Timing Actually Matters
You can do cost segregation when you acquire, construct, or renovate. But timing changes the math.
If you do it in the year of acquisition, you claim everything on your current return. One form. Clean.
If you do it three years later, you need to file a change in accounting method using Form 3115. You catch up on the depreciation you should have claimed through a Section 481(a) adjustment. You get it all in one year, which can be great if you need to offset a big gain.
The phase-out of bonus depreciation creates urgency. In 2027, bonus goes to zero. After that, you’re stuck with straight-line depreciation only. A $1 million improvement in 2025 with 40% bonus gives you a $400,000 deduction immediately. That same improvement in 2028 gives you $66,667 annually for 15 years.
Time value of money says take the deduction now. $400,000 today is worth way more than $66,667 per year over 15 years. This is why smart operators are front-loading improvements.
The Section 179 Wildcard
Section 179 lets you expense up to $1,250,000 in 2025. But it has specific rules for real property.
You can only use it on qualified real property—roofs, HVAC, fire protection, alarm systems, and security systems. Not walls. Not general buildouts. Specific improvement categories.
The benefit? You can take a full deduction up to your business income limit. Bonus depreciation can create losses. Section 179 cannot. If your business makes $500,000 and you have $600,000 in Section 179 deductions, you can only use $500,000.
The unused amount carries forward. You don’t lose it. But you don’t get the benefit now.
For most commercial property improvements, bonus depreciation is better because there’s no income limitation. You can create a net operating loss and carry it back or forward.
When Working With a Professional Actually Saves Money
I’ve seen companies try to DIY this. They use their regular CPA who does their tax return every April. That CPA is great at compliance. But they’re not specialists in tangible property regulations, cost segregation, or QIP classification.
Here’s what a professional cost segregation firm brings that your regular accountant doesn’t.
They have engineers on staff. Not accountants pretending to understand construction. Actual licensed engineers who review blueprints, conduct site visits, and understand building systems.
They stay current on IRS guidance. There was a Chief Counsel Advice memo in 2019 about HVAC systems. It confirmed that interior units serving tenant spaces qualify for 15-year treatment. Most accountants never saw that guidance. Specialty firms live in this stuff.
They provide audit defense. If the IRS examines your return, which firm wrote the cost segregation report matters. A study from a credible firm with proper engineering documentation usually ends the discussion. A homemade Excel spreadsheet from your bookkeeper? That’s getting adjusted 100% of the time.
The cost is marginal compared to the benefit. We’re talking about accelerating hundreds of thousands in deductions. Paying $15,000 for a proper study is insurance and optimization combined.
What to Look For in a Provider
Not all cost segregation firms are equal. Some are accounting firms that dabble. Others are engineering-based specialists who’ve been doing this for 25+ years.
Look for ASCSP certification—that’s the American Society of Cost Segregation Professionals. It means they follow actual standards.
Ask about their audit defense record. Have they supported clients through IRS examinations? What was the outcome? If they get defensive about this question, walk away.
Check if they have in-house engineers or if they outsource the engineering work. In-house is better. It means quality control and accountability.
Get a sample report. A good cost segregation report is 50-100 pages with photos, calculations, and detailed asset listings. If someone promises you a report in 48 hours, that’s not a real study. That’s a desktop review that won’t hold up.
Your Cash Flow Depends on Getting This Right
The difference between 39-year and 15-year depreciation is massive. An annual deduction of $25,641 versus $66,667 for a $1 million improvement. That’s $41,026 more deduction per year for 15 years.
At a 35% combined federal and state tax rate, that’s $14,359 in annual tax savings. Over 15 years, the present value of that difference is roughly $150,000.
Now add bonus depreciation. 40% of $1 million is $400,000 deducted immediately in 2025. That’s a $140,000 tax savings this year instead of spread over decades.
This isn’t theoretical. This is money that either stays in your business or goes to the government. Most businesses are cash flow constrained. They’re choosing between hiring another employee, opening a new location, or paying down debt.
Tax savings from proper depreciation treatment fund growth. I’ve seen businesses accelerate their expansion timelines by 2-3 years just by optimizing depreciation strategies.
But it requires you to act. The rules exist. The benefits are there. You just need to claim them correctly. Work with qualified professionals. Do cost segregation studies. File the right forms. Track the state conformity issues. Follow through.
Your leasehold improvements depreciation life isn’t just a tax compliance issue—it’s a strategic business decision that affects your cash flow, growth potential, and competitive positioning for the next 15-39 years.
Leasehold Improvements Depreciation Life FAQs
What is the leasehold improvements depreciation life under current IRS rules?
The current leasehold improvements depreciation life is 15 years for Qualified Improvement Property using straight-line depreciation, with bonus depreciation of 40% available in 2025 for immediate deduction. Properties that don’t qualify as QIP are depreciated over 39 years.
How does the CARES Act affect leasehold improvements depreciation?
The CARES Act retroactively fixed a TCJA drafting error that had incorrectly assigned QIP a 39-year life. Now QIP placed in service after December 31, 2017 qualifies for 15-year depreciation and bonus depreciation, and businesses can amend prior returns to claim missed benefits.
Can I expense leasehold improvements immediately instead of depreciating them?
You can immediately expense individual items under $2,500 using the de minimis safe harbor election. For larger improvements, you can claim bonus depreciation (40% in 2025) in year one, with the remainder depreciated over 15 years if the improvements qualify as QIP.
What happens to my leasehold improvements depreciation if I have lease renewal options?
Under Section 178, if your remaining lease term is less than 60% of the improvement’s useful life when completed, you must include renewal options in your depreciation calculation. This can extend or shorten your depreciation period beyond the standard 15 or 39 years.
Do landlords and tenants depreciate leasehold improvements the same way?
No, the party who owns and pays for the improvements claims the depreciation. If the landlord pays and owns them, the landlord depreciates them. If the tenant pays and owns them, the tenant depreciates them. Tenant improvement allowances have special rules under Section 110 that determine ownership and tax treatment.
Citations
- Internal Revenue Service, Publication 946 (2024) – How To Depreciate Property
- Electronic Code of Federal Regulations, 26 CFR § 1.178-1 – Depreciation or amortization of improvements on leased property
- Bloomberg Tax, Qualified Improvement Property Analysis (2024)
- Plante Moran, The CARES Act and Qualified Improvement Property (2020)
- Boutin Jones Inc., The CARES Act and Qualified Improvement Property (2021)
- The Tax Adviser, Qualified Improvement Property and Bonus Depreciation (2021)
- Colliers, Current Tax Treatment For Tenant Improvements
- Internal Revenue Service, Tangible Property Final Regulations
- McGuire Sponsel, Leasehold Improvements & Depreciation Life (2025)
- CSSI Services, Leasehold Improvements Depreciation & Its Tax Benefits (2025)
- Alvarez & Marsal, Cost Segregation Services (2025)
- AccountingWEB, A Practical Guide to Depreciating Improvements Under Section 178 (2018)
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.