Is the sale and installation of an F-5-rated prefabricated storm shelter, anchored into a concrete foundation, taxable as tangible personal property or exempt as an improvement to real property?

Plain-English summary

A company fabricates F-5-tornado-rated storm shelters at an out-of-state facility using robotics, then sells and installs them across most states, including Texas. The shelters — ranging from small residential safe rooms to larger commercial models — are anchored into reinforced concrete foundations (4 inches thick for residential, 12-17 inches for commercial) using specialized wedge anchors and sealant, per National Storm Shelter Association guidelines. They can technically be unbolted and moved, but doing so voids their NSSA certification unless reinstalled by an NSSA-affiliated company. The company asked how Texas taxes its charges for selling and installing these shelters.

The Comptroller ruled the shelters are improvements to real property — they're prefabricated buildings under Rule 3.306, built off-site and later affixed to a permanent foundation, similar to manufactured structures the Comptroller has previously found become "permanent accessions to the land" once anchored. That classification then determines the tax treatment: if the company charges one lump-sum price covering both materials and installation, the whole charge is not taxable (the company itself owes tax on the materials it buys, but doesn't collect anything from the customer). If the company bills materials and labor separately, it must collect tax on the materials charge (or its own cost for the materials, whichever is greater) — but the separately stated labor charge stays tax-free either way.

What this means for you

Prefabricated building, storm shelter, and modular structure sellers/installers

Whether your product becomes a taxable sale of tangible personal property or an exempt "improvement to realty" often turns on installation method: is it bolted/anchored to a permanent foundation such that removal would cause substantial damage? If so, treat it as real property improvement — and structure your invoice as a lump sum whenever you want to avoid passing tax through to the customer.

Contractors billing separately for materials vs. labor

If you break out materials and labor as separate line items on a real-property-improvement job, you (the contractor) must collect tax on the materials charge — using either the contract price for materials or your own cost, whichever is higher — while the labor line item remains untaxed. Lump-sum billing avoids customer-facing tax collection entirely (you pay tax on your own material purchases instead).

Accountants and tax professionals

The ruling applies the same "permanent accession to the land" reasoning from Comptroller's Decision No. 20,394 (1990) — wedge-anchor bolting, sealant, and adhesive attachment methods were sufficient there and here to convert tangible personal property into realty under Rule 3.347(a)(2), triggering Rule 3.291's contractor billing rules rather than straight retail sales tax.

Common questions

Q: Does the fact that a storm shelter can technically be unbolted and moved change its tax treatment?
A: Not on these facts — even though the shelters can be moved, doing so damages the NSSA certification and requires professional reinstallation, and the Comptroller focused on how the shelter is installed and intended to function, not whether relocation is theoretically possible.

Q: What's the tax difference between lump-sum and separated billing for real property improvements?
A: Lump-sum: no tax charged to the customer (the contractor pays tax on materials as the end consumer). Separated: the contractor must collect tax from the customer on the materials portion (or their own cost, if higher), while labor stays exempt.

Q: Can another storm-shelter or prefab-building company rely on this ruling?
A: No. It's a private letter ruling binding on the Comptroller only for the taxpayer and facts submitted, and it cannot be relied on by any other taxpayer — differences in installation method or foundation depth could change the analysis.

Citations and references

Statutes, rules, and decisions:

• Tex. Tax Code § 151.051 (Sales Tax Imposed); § 151.010 ("Taxable Item")
• Tex. Tax Code § 151.009 ("Tangible Personal Property")
• 34 Tex. Admin. Code Rule 3.347(a) (Improvements to Realty)
• 34 Tex. Admin. Code Rule 3.306(a)(10), (b)(4)(A) (Prefabricated Buildings)
• 34 Tex. Admin. Code Rule 3.291(b)(3)(A), (b)(4)(A) (Contractors — lump-sum vs. separated billing)
• Comptroller's Decision No. 20,394 (1990) (anchored structures become permanent accessions to land)

Source

• STAR search: https://star.comptroller.texas.gov/search?doc_type_code=L&tax_type_code=SST
• Opinion: https://star.comptroller.texas.gov/view/201807026L

Original ruling text

July 16, 2018

RE: Private Letter Ruling No. 20171027151955

*, Taxpayer No. *

Dear ****:

We issue this private letter ruling in accordance with Rule 3.1, Private Letter Rulings and General Information Letters.[1] We are responding to your request dated Oct. 17, 2017.

Detrimental reliance relief is provided in accordance with Rule 3.10, Taxpayer Bill of Rights.

You requested guidance on the taxability of charges for the sale and installation of storm shelters.

Facts Presented

The relevant facts are based on information contained in your request for a private letter ruling and our subsequent email correspondence, as well as publicly available information provided on your website.

**** (Taxpayer) fabricates, sells, and installs storm shelters in most states, including Texas. The storm shelters are designed to withstand a category F-5 tornado and range in size from small safe rooms for residential use to larger commercial shelters. Taxpayer uses state of the art robotics to fabricate the shelters at a facility located outside of Texas.

Taxpayer installs the storm shelters on customers’ premises by attaching them to reinforced concrete at least 12-17 inches thick for commercial models and at least 4 inches for residential models. Taxpayer’s website explains that a shelter will not comply with the National Storm Shelter Association (NSSA) guidelines unless it is anchored into a concrete foundation of at least that depth.

Taxpayer lays the concrete foundation to which many of its storm shelters are attached. Taxpayer may also install a shelter on a customer's existing foundation, which may sometimes be within an existing building.

Taxpayer installs the storm shelters using specialized wedge anchors and a sealant or adhesive. The wedge anchors are identical to ones used to attach steel beams in commercial steel framed buildings and bridges. These anchors can be removed by cutting them off with a specialized saw. There are no power, sewage, or other connections between the storm shelter and the concrete foundation.

Taxpayer's residential storm shelters may be moved, but they will not remain NSSA verified storm shelters unless they are reinstalled by a company affiliated with the NSSA. Commercial storm shelters are also capable of being moved, but are intended to remain in one location.

Question, Ruling, and Analysis

Our restatements of your questions are shown below, followed by our response and analysis.

Question One: Are Taxpayer’s storm shelters improvements to real property?

Ruling One: Yes. Taxpayer’s storm shelters are prefabricated buildings and constitute improvements to real property.

Question Two: Are Taxpayer’s charges for the sale and installation of storm shelters taxable?

Ruling Two: Taxpayer’s charge for the sale and installation of a new storm shelter is not taxable if Taxpayer charges a lump-sum price for materials and labor. Rule 3.306(b)(4)(A) (Sales of Mobile Offices, Oilfield Portable Units, Portable Buildings, Prefabricated Buildings, and Ready-Built Homes) and Rule 3.291(b)(3)(A) (Contractors). If Taxpayer bills separately for labor and materials, Taxpayer must collect tax on the agreed contract price for materials, or the price of the materials to Taxpayer, whichever is greater. Rule 3.291(b)(4)(A).

Analysis:

Sales tax is imposed on each sale of a taxable item in this state. Section 151.051 (Sales Tax Imposed). The term “taxable item” means tangible personal property and taxable services. Section 151.010 (Taxable Item).

Section 151.009 (“Tangible Personal Property”) defines tangible personal property to mean personal property that can be seen, weighed, measured, felt, or touched or that is perceptible to the senses in any other manner. Tangible personal property becomes an improvement to realty when it is embedded in or permanently affixed to the land or to a structure constituting realty and when, after installation, is necessary to the intended usefulness of the building or other structure. Rule 3.347(a)(2) (Improvements to Realty).

Rule 3.306 addresses the sales tax due on the sale and installation of prefabricated and modular structures. The tax due on these transactions depends, in part, on whether the structures retain their identity as tangible personal property or instead are improvements to realty.

Rule 3.306(a)(10) defines a prefabricated building as a structure, not designed to be a residential dwelling, that is built at a location other than its permanent site, and is later transported and affixed to real property. A contract to sell a prefabricated building is considered a contract for an improvement to real property when the seller is required to build, transport, and affix the structure to a permanent site. See Rule 3.306(b)(4)(A). The seller's sales tax responsibilities are determined under Rule 3.291.

Comptroller’s Decision No. 20,394 (1990) considered whether certain manufactured structures were “prefabricated buildings” as defined in Rule 3.306. The Petitioner hired contractors to construct, deliver, and install pre-fabricated, pre-engineered buildings and structures. The contractors installed the structures through various means, including anchoring, bracketing, bolting, and caulking the structures to their foundations. The Administrative Law Judge determined that when the contractors anchored the structures to their foundations, the structures became permanent accessions to the land because “this anchoring effected [the contractors’ and Petitioner’s] intent to have the structures become permanent accessions to the land.” Therefore, the structures were prefabricated buildings, as defined in Rule 3.306, and the lump-sum price Petitioner paid for the sale and installation of the structures was not taxable under Rule 3.291.

Taxpayer’s storm shelters are also prefabricated buildings as defined in Rule 3.306. Taxpayer’s storm shelters are not designed to be residential dwellings and are built at Taxpayer’s out-of-state manufacturing facility. Taxpayer installs the storm shelters to permanent concrete foundations using means like those described in Comptroller’s Decision No. 20,394 – wedge anchor bolts, sealants, and adhesives – and the NSSA has certified that this means of installation is sufficient to withstand a class F-5 tornado.

Based on the above Comptroller’s decision and information taken from Taxpayer’s request and from its website, the storm shelter is affixed to realty. Consequently, Taxpayer’s sales tax responsibilities are determined under Rule 3.291.

Under Rule 3.291, if Taxpayer contracts to sell and install the storm shelters for a lump- sum amount, Taxpayer owes tax on all tangible personal property incorporated into the customer’s realty, but Taxpayer would collect no tax from its customer. Rule 3.291(b)(3)(A). If Taxpayer performs services under a separated contract, Taxpayer is a retailer of all materials that are physically incorporated into the realty that is being improved and must collect tax from the customer on the charge for the materials. Rule 3.291(b)(4)(A). The separately stated charge for labor is not taxable.

Comptroller’s decisions and other documents cited can be found on the Comptroller’s STAR system. The Texas Tax Code, Texas Administrative Code, and the STAR system are accessible on the Comptroller’s website at www.comptroller.texas.gov/taxes/.

If you have questions about this private letter ruling, please email us through our website at https://comptroller.texas.gov/web-forms/tax-help/ and reference Private Letter Ruling No. 20171027151955.

Sincerely,

Tax Policy Division –Indirect Taxes

Texas Comptroller of Public Accounts

ENDNOTE:

[1] Unless otherwise indicated, all references to “Section” are to the Texas Tax Code, and all references to “Rule” are to Title 34 of the Texas Administrative Code.