The term “directly used” in the context of the Texas research and development sales tax exemption refers to depreciable tangible personal property that has an immediate effect on an item or activity during the actual performance of qualified research. This standard requires that the property be engaged in a process of experimentation without intervening, ancillary, or prior effects that are removed from the core technological discovery.

The Statutory Architecture of Texas Research and Development Incentives

The Texas Research and Development (R&D) tax incentive framework is a dual-track system designed to stimulate technological innovation and high-skilled employment within the state. Established by the 83rd Texas Legislature in 2013 through House Bill 800, the program allows qualifying taxpayers to select between a franchise tax credit and a sales and use tax exemption. The sales tax exemption is specifically codified in Texas Tax Code Section 151.3182, titled “Certain Property Used in Research and Development Activities; Reporting of Estimates and Evaluation”. This section provides that the sale, storage, or use of depreciable tangible personal property directly used in qualified research is exempted from the taxes imposed under Chapter 151 of the Tax Code, provided the purchaser meets specific registration and exclusivity requirements.

The administrative implementation of this statute is primarily governed by 34 Texas Administrative Code (TAC) Section 3.340, which provides the Comptroller’s official interpretation of what constitutes “qualified research” and “direct use”. Furthermore, Rule 3.599 governs the interaction between the sales tax exemption and the R&D franchise tax credit, ensuring that taxpayers do not engage in “double-dipping” by claiming both incentives for the same accounting period. The legal weight of these regulations is significant, as the Comptroller has broad authority to adopt rules necessary for the administration of the tax code.

Defining Depreciable Tangible Personal Property

To qualify for the exemption under Section 151.3182, an item must first meet the definition of “depreciable tangible personal property.” The statute sets a rigorous two-pronged test for this classification. First, the property must have a useful life that exceeds one year. Second, the property must be subject to depreciation under Generally Accepted Accounting Principles (GAAP) or under Sections 167 or 168 of the Internal Revenue Code (IRC). This requirement distinguishes R&D equipment from “supplies.” While supplies may be included in the calculation of the R&D franchise tax credit, they do not qualify for the sales tax exemption because they are generally consumed within a year and are not depreciable assets.

The exclusion of non-depreciable items like electricity and natural gas is a frequent point of contention during audits. While these utilities may be essential to powering a laboratory, they are not “tangible personal property” that is “depreciable” over a multi-year period, and thus they remain taxable unless they qualify under a separate exemption, such as the manufacturing exemption which utilizes a “predominant use” study for utilities.

The Functional Meaning of “Directly Used” in Research Activities

The Comptroller’s office has established a narrow and specific interpretation of what it means for an item to be “directly used.” Guidance provided in STAR documents and the Texas Administrative Code defines “directly” as having an immediate effect on an item or in an activity, without an intervening, ancillary, or prior effect. This definition is intended to separate the primary experimental machinery from the broader support infrastructure of a business.

The Actual Performance Standard

Under Rule 3.340(a)(6), depreciable tangible personal property is considered directly used in qualified research only if it is used in the “actual performance of activities” that are part of the qualified research. This requires a physical and functional nexus between the asset and the experimental process. The Comptroller provides a non-exhaustive list of items that typically meet this standard when used by personnel in the process of experimentation:

• Machinery and equipment specifically designed for testing or prototyping.
• Computers and specialized software used for data modeling, simulation, or technical analysis.
• Tools and laboratory furniture, including specialized desks, tables, stools, benches, and storage cabinets used within the research environment.

The inclusion of laboratory furniture is a unique aspect of the Texas R&D exemption, as such items are often excluded from other specialized exemptions. However, the rule is clear that even these items must be used by personnel in the process of experimentation. A desk used by a research scientist to record experimental data during a trial would likely qualify, whereas a similar desk used by an administrative assistant for payroll would not.

Ancillary and Support Exclusions

A significant portion of state revenue office guidance is dedicated to identifying what does not constitute direct use. Property is not directly used in qualified research if it is used in ancillary or support activities. These activities include:

• Administration: General business computers, office supplies, and furniture used by non-research personnel such as accounting, clerical, or legal staff.
• Maintenance: Tools or equipment used for facility upkeep, janitorial services, or the repair of non-research assets.
• Marketing and Distribution: Equipment used to promote a product or manage its logistics once the research phase is complete.
• Transportation: Vehicles or conveying equipment used for general business purposes or for moving finished goods.

This distinction creates a “cleanroom” approach to tax compliance, where taxpayers must delineate the physical boundaries of their research operations. In an audit, the Comptroller may request floor plans, asset logs, and employee job descriptions to verify that exempt property is situated within research-dedicated spaces and used by research-dedicated personnel.

The Four-Part Test: Federal Standards in the Texas Context

Because the Texas Tax Code explicitly ties the definition of “qualified research” to IRC Section 41(d), the federal “Four-Part Test” serves as the foundational requirement for the sales tax exemption. If the activity does not meet all four parts of the federal test, the property used in that activity cannot qualify for the Texas exemption, regardless of its physical involvement.

Technical Application of the Four-Part Test

The four requirements are cumulative, meaning the failure of any single part disqualifies the entire activity.

1. The Section 174 Test: The research must be intended to eliminate uncertainty regarding the development or improvement of a product or process. Uncertainty exists if the information available to the taxpayer does not establish the capability or method for developing the business component, or the appropriate design of the business component.
2. The Technological in Nature Test: The process of experimentation must rely on the principles of physical science, biological science, engineering, or computer science. Research in the social sciences, arts, or humanities is specifically excluded from the Texas definition.
3. The Business Component Test: The research must be undertaken to discover information that is intended to be applied to develop a new or improved business component of the taxpayer. A “business component” is defined as any product, process, computer software, technique, formula, or invention to be held for sale, lease, or license, or used in the taxpayer’s trade or business.
4. The Process of Experimentation Test: Substantially all of the activities (generally interpreted as 80% or more) must involve a process of experimentation. This involves the evaluation of alternatives through trial and error, modeling, simulation, or other systematic methods to reach a functional design.

Statutory Exclusions to Qualified Research

Texas revenue office guidance reiterates specific federal exclusions that are strictly enforced at the state level. Property used in the following activities is ineligible for the R&D sales tax exemption:

• Research conducted after the beginning of commercial production of the business component.
• Adaptation of an existing product or process to a particular customer’s needs.
• Duplication of an existing product or process.
• Surveys, efficiency studies, management studies, or market research and testing.
• Research related to style, taste, cosmetic, or seasonal design factors.
• Funded research, where the research is conducted under a grant or contract from another person or governmental entity.

Software Development and the “Direct Use” Threshold

Software development represents a particularly complex area for the “directly used” standard. Under 34 TAC § 3.340, the Comptroller provides detailed guidance on which software activities constitute qualified research. Because software itself is tangible personal property in Texas (if provided in a physical medium or downloaded), the computers and peripheral hardware used to develop that software may qualify for the exemption if the software development meets the research criteria.

Qualifying vs. Non-Qualifying Software Activities

The Comptroller distinguishes between high-level innovation and routine coding. For the hardware used in development to be exempt, the software project itself must involve a high degree of technical uncertainty.

Internal-Use Software (IUS) Controversies

Internal-use software—software developed for the taxpayer’s own internal administrative or management functions—is subject to a higher standard of scrutiny. Under the current Texas regime (pre-2026), the Comptroller has historically taken a restrictive view of IUS. To qualify, IUS must generally meet an “innovation test,” meaning it must result in a reduction in cost or improvement in speed that is substantial and economically significant. The 2021 regulations (Rule 3.599) caused significant controversy by limiting the franchise credit for IUS and applying these standards retroactively, a move that prompted legislative correction in the 2025 session.

Administrative Procedures and Compliance Requirements

To claim the R&D sales tax exemption, a person must comply with several administrative steps established by the Comptroller. Unlike the manufacturing exemption, which can often be claimed by simply providing a certificate to a vendor, the R&D exemption requires formal state registration.

Registration with the Comptroller

A taxpayer must register with the Comptroller’s office and obtain a Texas Qualified Research Registration Number (RD Number) before claiming the exemption. This is done using Form AP-234, “Texas Registration for Qualified Research and Development Sales Tax Exemption”. The application requires:

1. The taxpayer’s 11-digit Texas taxpayer number or 9-digit federal identification number.
2. A certification that the taxpayer will not claim the R&D franchise tax credit for any period in which it claims the sales tax exemption.
3. Historical data regarding R&D spending and employment in Texas.

Once the RD Number is issued, the taxpayer provides Form 01-931, the “Texas Qualified Research Sales and Use Tax Exemption Certificate,” to vendors at the time of purchase.

Retroactive Registration and Refund Claims

The law allows for a registration number to be given retroactive effect, provided the taxpayer follows specific procedures. A registration number can be made retroactive to the later of January 1, 2014, or a date requested by the registrant that is no more than four years prior to the date the application is received.

• To obtain a retroactive number, the taxpayer must complete an annual information report for each prior year included in the request.
• The requested date cannot fall within an accounting period during which the taxpayer claimed the R&D franchise tax credit.
• Once a retroactive RD Number is issued, the taxpayer may file a claim for a refund of sales tax paid on qualifying purchases made during that period, in accordance with the general refund rules under Rule 3.325.

The Mutual Exclusivity Doctrine: The “One or the Other” Rule

A fundamental principle of the Texas R&D regime is that the sales tax exemption and the franchise tax credit are mutually exclusive. Under Tax Code Section 171.653 and Section 151.3182(b)(2), a taxable entity is ineligible for the franchise tax credit for qualified research expenses incurred during a period if the entity (or any member of its combined group) received a sales tax exemption during that same period.

Calculation of the Reporting Period

The “period” for exclusivity is tied to the accounting period on which the franchise tax report is based. This means that if a company makes even a single tax-free purchase under the R&D sales tax exemption in January, it may be barred from claiming the R&D franchise tax credit (which covers wages, supplies, and contract research) for that entire fiscal year.

However, the law provides a narrow exception for carryforwards. An entity that is ineligible for the current year’s credit due to claiming a sales tax exemption is still permitted to claim a credit carryforward from a previous report. This allow companies to use up old credits while transitioning to a sales-tax-heavy procurement phase.

Strategic Implications for Taxpayers

The choice between the two incentives requires a detailed cost-benefit analysis. The sales tax exemption provides an immediate cash benefit of roughly 6.25% to 8.25% (depending on local rates) on the purchase price of equipment. The franchise tax credit, conversely, is generally calculated as 5% of the increase in total R&D spending over a base amount (typically 50% of the average of the previous three years).

Companies with low incremental R&D spending but high capital equipment needs (such as established manufacturing labs) often find the sales tax exemption more valuable. Startups and technology firms with massive payrolls but minimal depreciable equipment almost always favor the franchise tax credit.

Divergent Use and Recapture of Tax Benefits

When property is purchased tax-free under the R&D exemption but is subsequently used for a non-exempt purpose, the law requires the taxpayer to remit “divergent use” tax.

The 1/48th Rule

The Comptroller utilizes a specific formula to recapture sales tax when the “direct use” of an asset is interrupted or changed. For divergent use occurring after September 30, 2001, the tax due is calculated on a monthly basis.

The amount of tax due for a month of divergent use is determined by:

Tax Due = (1/48 x Purchase Price) x Percent of Divergent Use x Tax Rate

The “Percent of Divergent Use” can be calculated using either the “Hours of Divergent Use” formula (total non-exempt hours divided by total hours of operation) or the “Total Output” formula (total non-exempt output divided by total output).

The Four-Year Statute of Repose

Significantly, the law provides a limit on this recapture. No tax is due on divergent use if it occurs in any month after the fourth anniversary (48 months) of the equipment purchase date. This essentially means that after four years of qualified “direct use,” the taxpayer is free to use the equipment for any purpose without incurring additional sales tax liability.

Legal Precedents and the Doctrine of Strict Construction

The interpretation of “directly used” is heavily influenced by the legal doctrine of strict construction, which requires that tax exemptions be interpreted narrowly and in favor of the taxing authority. The most influential case in this regard is Laredo Coca-Cola Bottling Co. v. Combs (2010).

The Laredo Bottling Principle

In Laredo, the court held that for a manufacturing exemption to apply, the person claiming the benefit must be the same person using the property in the exempt activity. The Comptroller has formally adopted this principle for the R&D exemption in Private Letter Ruling No. PLR20221109154351.

In the ruling, a parent company performed qualified research, but a subsidiary (the “Taxpayer”) purchased the equipment and materials to build the research facility. The Taxpayer had no employees and no R&D activity of its own; it merely provided the facility and equipment to the parent. The Comptroller ruled that the Taxpayer could not use the parent’s RD Number or research activities to qualify for the exemption.

Implications for Combined Groups

This ruling highlights a critical compliance risk for complex corporate structures. Even if a group files a “combined report” for franchise tax purposes, the sales tax exemption is an entity-level determination. To qualify:

1. The specific legal entity making the purchase must be the entity engaged in the research.
2. Or, there must be a valid lease/rental agreement where the property is “leased or rented to… a person who is engaged in qualified research”.

In the absence of a formal agreement or direct research activity by the purchasing entity, the exemption will be denied during an audit.

The Transformation of Texas R&D Law: Senate Bill 2206

A pivotal shift in the “directly used” standard occurred in June 2025 with the enactment of Senate Bill 2206. This legislation represents a complete overhaul of the Texas R&D incentive structure, designed to simplify administration and increase the state’s global competitiveness.

Repeal of the Sales Tax Exemption

Effective January 1, 2026, the R&D sales and use tax exemption under Section 151.3182 is repealed. Taxpayers will no longer be able to make tax-free purchases of R&D equipment using an RD Registration Number. Instead, all R&D-related property will be subject to standard sales and use tax at the time of purchase.

The Move to an Enhanced Franchise Tax Credit

To compensate for the loss of the sales tax exemption, SB 2206 creates a new, expanded, and permanent R&D franchise tax credit in a new Subchapter T of Chapter 171.

The Supply Exclusion Override

One of the most significant changes in SB 2206 relates to the treatment of “supplies.” Under current regulations (Rule 3.599), the Comptroller has the authority to exclude certain supplies from the R&D credit calculation if they were purchased using a different exemption, such as the manufacturing exemption. SB 2206 specifically overrides this regulation, providing that expenses for supplies properly reported as QREs on federal Form 6765 may not be excluded from the Texas credit based on their sales tax status. This eliminates a major source of audit controversy and aligns state practice with federal reporting.

Comprehensive Case Example: The Lifecycle of an R&D Asset

To illustrate the application of “directly used” guidance and the upcoming legislative changes, consider the scenario of “Stellar Dynamics,” a Texas aerospace manufacturer.

Phase 1: Procurement under the Current Regime (2024)

In August 2024, Stellar Dynamics purchases three specific assets:

1. A $2,000,000 environmental chamber used to test satellite sensors under vacuum conditions.
2. A $50,000 server used to manage the lab’s data acquisition system.
3. $10,000 worth of specialized chemical resins used to create prototypes in a 3D printer.

Analysis:

• Environmental Chamber: This is depreciable property. Because it is used in the actual performance of experimentation (testing the physical limits of a business component), it is “directly used” in qualified research. Stellar Dynamics uses its RD Registration Number to purchase it tax-free, saving $165,000 in sales tax (at an 8.25% rate).
• Lab Server: This server facilitates the research by acquiring data. Under Rule 3.340(a)(6), computers used by personnel in the process of experimentation are directly used. Stellar Dynamics claims the exemption.
• Chemical Resins: These are supplies. They do not have a useful life exceeding one year and are not depreciable. Therefore, they do not qualify for the Section 151.3182 exemption. Stellar Dynamics pays sales tax on these items but includes them as “In-House Research Expenses” in its 2024 R&D franchise tax credit calculation.

Phase 2: Divergent Use and Audit (2025)

In March 2025, a project is delayed, and Stellar Dynamics uses the environmental chamber for 100 hours of routine quality control testing for a customer’s existing satellite parts (not qualified research). The machine ran for a total of 200 hours that month.

Analysis:

The 100 hours of non-research use constitute “divergent use”. The percentage of divergent use is 50%.

Tax Due = (1/48 x $2,000,000) x 0.50 x 0.0825 = $1,718.75

Stellar Dynamics must report and pay this amount to the Comptroller.

Phase 3: Transition to the New Regime (2026)

On February 1, 2026, Stellar Dynamics purchases a new robotic assembly arm for $1,000,000 to test new manufacturing processes.

Analysis:

The R&D sales tax exemption has been repealed. Stellar Dynamics must pay the full $82,500 in sales tax at the time of purchase. However, they will now benefit from the enhanced franchise tax credit. Instead of a 5% credit, they will calculate their credit at 8.722% of the expenditure. Furthermore, because the new law ties the credit to Line 48 of Form 6765, the entire cost (including the sales tax paid) will likely be included in the Texas QRE pool, provided the activity meets the federal standards.

Final Synthesis and Strategic Recommendations

The “directly used” standard has functioned as a critical filter for the Texas R&D sales tax exemption, demanding that taxpayers prove an immediate, physical link between their assets and the experimental process. The complexity of this standard—ranging from entity-level qualification under the Laredo doctrine to the minute-by-minute tracking required for divergent use—has historically made the exemption a high-risk area for audits.

As the state transitions to the SB 2206 framework in 2026, the focus shifts from the use of the asset to the reporting of the expense. This evolution reflects a broader trend toward administrative simplification and federal alignment. For professional peers managing Texas R&D incentives, the following conclusions are paramount:

• Historical Compliance: Maintain exhaustive contemporaneous records for all “directly used” assets purchased between 2014 and 2025. The repeal of the exemption does not waive the state’s right to audit these periods for the next four years.
• Entity-Level Verification: Ensure that the entity performing the research is the legal owner/purchaser of the equipment to satisfy the Laredo doctrine.
• Systemic Transition: Pivot project-tracking and accounting systems to focus on Line 48 of IRS Form 6765. The “Rolling Conformity” provided by SB 2206 means that a successful federal R&D study will now be the primary evidence for state-level compliance.
• Supply Strategy: Capitalize on the SB 2206 override of the supply exclusion rule. This legislative change provides a unique opportunity to include expenses in the R&D credit calculation that were previously barred due to their sales tax status.

Through diligent application of these principles, taxpayers can navigate the transition from the “directly used” era to the new federal-aligned regime, securing the full value of Texas’s innovation incentives while minimizing audit exposure.