Originally published: December 15, 2022 | Updated: June 2026
If you're planning an office build-out or renovation, the wall system you choose affects more than layout flexibility. It affects your tax bill.
Demountable walls qualify as office furniture, fixtures, and equipment under IRS rules, not structural building components. That single classification difference lets you recover the full cost in the year you buy, instead of depreciating it over 39 years. And under the One Big Beautiful Bill Act, signed into law in 2025, the first-year deduction picture for these projects just got more favorable.
- The 2026 Section 179 deduction cap is $2,560,000, permanent and indexed to inflation under the One Big Beautiful Bill Act, with a phase-out beginning at $4,090,000 in total equipment purchases
- The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualifying property placed in service after January 19, 2025, eliminating the prior phase-down schedule entirely
- Demountable walls depreciate over 7 years under IRS GDS/MACRS; conventional drywall depreciates over 39 years
- To qualify, walls must be placed in service before December 31 of the tax year in which you claim the deduction
- Section 179 and 100% bonus depreciation can stack for larger projects; for most commercial build-outs under $2.56M, Section 179 alone covers the full deduction
- The IRS treats demountable partitions as personal property, not real property. That classification drives the faster write-off
- Savings compound at reconfiguration: when you move demountable walls, there's no demolition cost and no capitalized loss on removed drywall
What Is Section 179 and How Does It Apply to Office Build-Outs?
Section 179 lets businesses deduct the full purchase price of qualifying equipment and property in the year it's placed in service, rather than depreciating it over multiple years. The 2026 deduction limit is $2,560,000, with a phase-out threshold beginning at $4,090,000 in total equipment purchases. Both figures are now permanent and indexed to inflation annually under the One Big Beautiful Bill Act. Prior law had legislated those limits on a patchwork, year-to-year basis.
For office build-outs, the classification question is what matters. The IRS distinguishes between structural components of a building (real property, 39-year depreciation) and furniture, fixtures, and equipment (personal property, 7-year depreciation under MACRS). Demountable walls fall into the second category.
Conventional drywall is a structural component. It's part of the building. Demountable walls aren't. They're modular panels mounted on aluminum frames that can be removed and reconfigured without disturbing the structure. The IRS recognizes this distinction, and it's worth real money.
Why Do Demountable Walls Qualify When Drywall Doesn't?
The IRS bases the classification on whether an item is inherently permanent or movable. Drywall is attached to the building structure and treated as a capital improvement to real property. Demountable partitions are panel-based, non-structural, and designed to be relocated, which puts them in the same category as office furniture and equipment.
Under the Modified Accelerated Cost Recovery System (MACRS), 7-year property uses the GDS 200% declining balance method. That means a $200,000 demountable wall system could generate roughly $28,571 in depreciation in year one under standard MACRS, or the full $200,000 in year one if you elect Section 179.
Contrast that with drywall: a $200,000 drywall build-out generates about $5,128 in depreciation in year one (39-year straight-line, mid-month convention). The difference in first-year tax impact on a $200,000 project, assuming a 25% effective tax rate, is approximately $48,700.
What Did the One Big Beautiful Bill Act Change?
The OBBB made two changes that directly affect how demountable wall projects get written off.
First: bonus depreciation is back to 100%, permanently. Prior law had been phasing it down: 60% for 2024, 40% for 2025, 20% for 2026, and 0% starting in 2027. The OBBB eliminated that phase-down for qualifying property placed in service after January 19, 2025. There's no longer a year-end deadline pressure to capture a higher rate. If you're installing demountable walls now or in any future tax year, 100% first-year bonus depreciation is available.
Second: Section 179 limits are now higher and permanent. The 2026 cap is $2,560,000 (nearly double the prior cycle's limit), with a phase-out starting at $4,090,000. These figures adjust for inflation going forward, so businesses can plan against a stable, predictable number rather than waiting on annual legislative patches.
One timing note: property acquired on or before January 19, 2025, or placed in service between January 1 and January 19, 2025, still falls under the old phase-down rules. If a project straddles that date, have your CPA confirm which rates apply.
The practical effect for most office build-outs planned or underway in 2026: full first-year deductibility is available, and the cap is high enough that Section 179 alone covers the vast majority of commercial renovation projects. For larger projects, bonus depreciation can stack on any remaining basis after Section 179 is applied.
What Types of Demountable Wall Systems Qualify?
Any demountable partition system that meets the IRS definition of personal property qualifies. This includes full-height glass partition systems (framed and frameless), solid panel systems with integrated doors, hybrid systems that mix glass lites with opaque panels, and modular dividing walls with integrated power channels.
NxtWall's Flex Series and View Series are two systems we supply that qualify under these criteria. The Flex Series supports glass-to-floor configurations with black, white, or custom frame colors. The View Series offers 3" narrow-frame profiles for a minimal aesthetic. Both can be reconfigured without structural modification.
The qualifying factor is whether the system is movable and non-structural. A licensed installer and a tax professional can confirm classification for your specific project.
How Do You Calculate the Tax Savings on a Demountable Wall Project?
NxtWall's tax savings calculator at nxtwall.com walks through the math for your specific project cost, tax rate, and depreciation method. Inputs are your total project cost, federal tax rate, and whether you're using Section 179, bonus depreciation, or standard MACRS.
A simplified example for a $150,000 demountable wall installation, using Section 179:
- Section 179 deduction (full): $150,000
- Tax savings at 25% effective rate: $37,500 in year one
- Equivalent drywall, year-one deduction at 39-year straight-line: ~$3,846
- Equivalent drywall, tax savings in year one: ~$962
The difference is $36,538 in first-year tax savings on an identically priced project, purely from how the IRS classifies the wall system. Under the OBBB's permanent 100% bonus depreciation, you'd arrive at the same number via that route as well. The two paths converge for projects under the Section 179 cap; for projects above it, bonus depreciation handles the remainder.
Do Demountable Walls Save Money Beyond the Tax Deduction?
Reconfiguration costs with drywall run $50–$150 per linear foot for demolition and rebuild. Demountable systems are a fraction of that. Panels are removed, relocated, and reinstalled without a general contractor.
For growing businesses that expect floor plan changes as headcount shifts, that flexibility has a cost value that compounds over a 5–10 year lease. Add in avoided disposal costs when leases end: drywall must be demolished while demountable systems come out intact and can be reinstalled elsewhere or returned to inventory. Total cost of ownership favors demountable systems for most commercial tenants.
What's the Next Step If You're Considering Demountable Walls?
We offer free space planning for demountable wall projects. That includes a layout drawing, product recommendation based on your aesthetic and acoustic requirements, and a project estimate you can take to your accountant for Section 179 planning.
Contact Parlor City Furniture to get started. We work with architects, facility managers, and business owners directly, and we can coordinate with your commercial real estate broker or general contractor if the project is part of a larger build-out.
Sources
IRS Publication 946: How to Depreciate Property: irs.gov/publications/p946
IRS: One Big Beautiful Bill Act Provisions: irs.gov/newsroom/one-big-beautiful-bill-provisions
IRS Treasury Guidance on OBBB Bonus Depreciation: irs.gov
NxtWall Tax Savings Calculator: nxtwall.com/nxtwall-tax-savings-calculator
MACRS Asset Class Table (IRS Publication 946, Appendix B): irs.gov/publications/p946
Parlor City Furniture is not a tax advisor or legal representative. The information in this article is based on publicly available IRS guidance and is provided for general informational purposes only. Tax rules change and individual circumstances vary. Consult a qualified CPA or tax professional before making any tax-related decisions.