Tax Code Section 171.651 defines the essential terms for the Texas research and development tax credit, primarily anchoring “qualified research” and “qualified research expenses” to the federal standards of the Internal Revenue Code as it existed on December 31, 2011, while strictly limiting eligibility to activities conducted within the State of Texas.

This statutory provision serves as the definitive boundary for the franchise tax credit, ensuring that state-level incentives are exclusively directed toward local economic activities by requiring that all research-related labor, supplies, and contractual obligations be physically performed or consumed within Texas borders. To understand the nuanced application of Section 171.651, one must examine the intersection of fixed-date federal conformity, the rigorous four-part test for qualified research, and the extensive body of administrative guidance provided by the Texas Comptroller of Public Accounts, which often interprets these definitions more stringently than their federal counterparts. The analysis must also account for the significant legislative shifts introduced by Senate Bill 2206, which will supersede the existing Subchapter M framework in 2026, transitioning the state toward a more streamlined, refundable credit model tied to federal reporting forms.

The Statutory Architecture of Subchapter M and Section 171.651

The enactment of Subchapter M in Chapter 171 of the Texas Tax Code represented a strategic reintroduction of research incentives following a period of fiscal austerity and legislative repeal. Originally established by House Bill 800 during the 83rd Regular Session in 2013, the subchapter was designed to place Texas on equal footing with other technology-heavy jurisdictions like California and Massachusetts. At the heart of this subchapter lies Section 171.651, which provides the lexicon necessary to navigate the complexities of the franchise tax credit.

The statute identifies four primary definitions that dictate the eligibility of every dollar claimed. First, it defines the “Internal Revenue Code” (IRC) as the version of the code in effect on December 31, 2011. This fixed-date conformity is vital because it protects the state’s budget from subsequent federal legislative changes, such as the Tax Cuts and Jobs Act of 2017, which significantly altered research expenditure amortization. Second, it defines “public or private institution of higher education” by referencing the Texas Education Code, a distinction that becomes critical when calculating the enhanced credit rates available for university-partnered research. Third and fourth, it defines “qualified research” and “qualified research expense” (QRE) by adopting the federal definitions found in IRC Section 41, provided the activities and expenditures occur in Texas.

Analysis of Fixed-Date Conformity: The 2011 IRC Nexus

The decision to tether the Texas R&D credit to the December 31, 2011, version of the IRC creates a unique legal environment. While the broader Texas franchise tax generally conforms to the IRC as of January 1, 2007, the R&D credit specifically utilizes the 2011 date to capture more modern federal interpretations of research activities while still maintaining a stable baseline for state administration.

This fixed-date conformity means that federal regulations adopted after 2011 do not automatically apply to Texas unless they are retroactive to the 2011 tax year or specifically recognized by the Comptroller. This has led to significant disputes, particularly regarding internal-use software (IUS). For instance, while federal guidance in 2016 expanded the eligibility of IUS for the federal credit, Texas taxpayers must still navigate the more restrictive standards of the 2011 code, which often require satisfying a “high threshold of innovation” test that the modern federal code has since relaxed.

Comparison of Federal and State IRC Conformity

The following table illustrates the divergence between federal and state tax linkages as they relate to research expenditures:

The Four-Part Test: Defining “Qualified Research” in Texas

To meet the definition of “qualified research” under Section 171.651(3), a taxpayer must satisfy the four-part test established by IRC Section 41(d), as interpreted by Texas administrative rules. This test acts as a sieve, separating routine business activities from the type of scientific advancement the state seeks to incentivize.

The Section 174 Test (Permissible Expenditures)

The research must first qualify as a deductible expense under IRC Section 174. This means the costs must be incurred in connection with the taxpayer’s trade or business and represent research and development costs in the experimental sense. These expenditures are aimed at activities intended to discover information that would eliminate uncertainty concerning the development or improvement of a business component. Uncertainty exists if the information available to the taxpayer does not establish the capability or method for developing or improving the product, or the appropriate design of the product.

The Technological Information Test

The research must be undertaken for the purpose of discovering information that is technological in nature. This requires that the process of experimentation fundamentally relies on principles of the physical or biological sciences, engineering, or computer science. The Texas Comptroller has consistently argued that this requires research to be more than just “technical”; it must often be “innovative” or “cutting-edge,” although this higher standard has been challenged in court as an extra-statutory requirement not found in the 2011 IRC.

The Business Component Test

A taxpayer must intend to use the discovered information to develop a new or improved “business component,” which 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. If a company is merely duplicating an existing product without discovering new technological information, it fails this test.

The Process of Experimentation Test

Finally, substantially all of the research activities must constitute a process of experimentation. This involves a systematic trial-and-error methodology where alternatives are evaluated through modeling, simulation, or physical testing. The “substantially all” requirement is generally interpreted as at least 80% of the research activities. If a company cannot demonstrate a structured process of evaluating alternatives to overcome technical uncertainty, the Comptroller may deny the credit during an audit.

Deconstructing Qualified Research Expenses (QREs)

Under Section 171.651(4), a QRE is essentially a cost that supports qualified research. These expenses are divided into in-house research expenses and contract research expenses.

In-House Research Expenses: Wages, Supplies, and Computers

In-house expenses are the primary drivers of the Texas R&D credit. They are comprised of three distinct categories:

• Wages: These are payments made to employees for “qualified services,” which include the direct conduct of research, the direct supervision of research, or the direct support of research. Administrative guidance in Rule 3.599 provides a “80/20 Rule”: if an employee spends at least 80% of their time on qualified services, 100% of their wages may be treated as QREs. If they spend less than 80%, only the portion of their wages attributable to actual qualified services can be claimed.
• Supplies: This includes any tangible property used in the conduct of qualified research, but it excludes land, land improvements, and property of a character subject to the allowance for depreciation. This exclusion is a major point of contention during audits.
• Computer Rental/Lease: These are amounts paid for the right to use computers in the conduct of research, often applied in the modern context to cloud computing costs for software development.

Contract Research Expenses and the Funding Rule

Taxpayers can claim 65% of the amounts paid to third parties for qualified research performed on their behalf. However, under Section 171.651 and Rule 3.599, the “funding” rule serves as a major obstacle. Research is considered “funded” (and thus ineligible for the credit) if the entity performing the research does not retain substantial rights to the results, or if the payments are not contingent on the success of the research.

If a Texas company contracts with a research firm and pays them regardless of whether the research succeeds, the contract is considered “funded research” and the expenses may be disallowed unless the company can prove it retained substantial rights. This ensures that the tax credit follows the entity that bears the economic risk of the research.

Local State Revenue Office Guidance: The Role of the Comptroller

The Texas Comptroller of Public Accounts (CPA) is the sole authority for administering the R&D credit. The primary vehicle for guidance is Title 34, Texas Administrative Code, Rule 3.599. This rule provides the “flesh” to the “bones” of Section 171.651.

Comptroller Memoranda and the Depreciable Property Dispute

In March 2025, the Comptroller issued Memorandum 202503003M to address a recurring issue in R&D audits: whether supplies can be “depreciable property”. Some taxpayers argued that because they expensed certain equipment under IRC Section 174, that equipment was no longer “depreciable” and thus qualified as a “supply” QRE. The Comptroller rejected this argument, stating that the determination of whether property is depreciable is made under IRC Section 167 based on the character of the property, not the taxpayer’s elective tax treatment.

This ruling highlights a fundamental principle of Texas R&D law: the definition of QREs is narrow. If a piece of equipment has a useful life of more than one year and is of a type that could be depreciated, it cannot be a supply, even if it is used exclusively for research. This guidance prevents companies from claiming large capital investments (like laboratory machinery) as supply QREs, pushing them instead toward the sales tax exemption (if available).

Combined Reporting and Intra-Group Transactions

A second critical guidance document, Memorandum 202503004M, addresses combined reporting. Unlike federal law, which treats “controlled groups” as a single taxpayer, Texas uses “combined groups” based on unitary business principles. The Comptroller ruled that federal intra-group transaction regulations—which disregard payments between related companies—do not apply in Texas. This means that a parent company in Texas can contract with its subsidiary in Texas for research, but the transaction must be carefully structured to avoid being classified as “funded research” and to ensure it aligns with Texas’s specific combined group requirements.

Internal-Use Software (IUS) and the “Innovation” Battle

The definition of “qualified research” for internal-use software has been the single most contentious issue under Section 171.651. Historically, the Comptroller’s office has utilized a more rigid interpretation of the 2011 IRC than the federal government currently does.

Qualitative Standards for Software Development

Administrative Rule 3.599(d)(5) outlines what software activities are likely to qualify. The Comptroller distinguishes between “innovative” software development and routine IT work.

The ongoing litigation in Ryan, LLC v. Hegar centers on these definitions. The plaintiffs argue that the Comptroller’s demand for research to be “innovative” or explore “frontiers” of science is an unlawful expansion of the 2011 IRC’s “eliminating uncertainty” standard. They contend that many “run-of-the-mill” technical projects still involve significant design uncertainty and therefore should meet the definition of qualified research under Section 171.651(3).

Procedural Realities: Burden of Proof and Documentation

Under Section 171.653(c), the burden of proof rests entirely on the taxpayer to establish both the entitlement to and the value of the credit. The Comptroller’s office interprets this as requiring contemporaneous business records. If a company does not have project-tracking software, time logs, or experimental results documented at the time the research occurred, the Comptroller may disallow the credit even if the research was clearly performed.

This “contemporaneous” requirement is often stricter than the IRS standard, which sometimes allows for “credible testimony” or “reasonable reconstruction” of expenses. In Texas, the revenue office guidance suggests that without hard data linking specific employees and supplies to specific technical uncertainties and experimental processes, a claim is unlikely to survive a franchise tax audit.

The Strategic Choice: Credit vs. Sales Tax Exemption

Section 171.652 and Section 151.3182 establish a binary choice for Texas businesses. A person engaged in qualified research can claim either a franchise tax credit based on QREs or a sales and use tax exemption on the purchase of depreciable property used directly in that research. They cannot claim both in the same period.

This election is made annually. For a capital-intensive business (like a semiconductor manufacturer purchasing multi-million dollar lithography machines), the sales tax exemption is often more valuable than the 5% incremental credit. For a labor-intensive business (like a software firm with high payroll but low equipment costs), the franchise tax credit is almost always the better option.

Comparative Table: Credit vs. Exemption

Quantitative Example: The “AeroTex” Case Study

To illustrate the application of Section 171.651 and the surrounding guidance, consider “AeroTex,” a fictional aerospace engineering firm based in Fort Worth. AeroTex is developing a new, fuel-efficient drone propeller.

Data Assumptions for AeroTex (Report Year 4)

AeroTex has three prior years of R&D history in Texas:

• Year 1 QREs: $800,000
• Year 2 QREs: $950,000
• Year 3 QREs: $1,250,000

In the current year (Year 4), AeroTex incurs:

• $1,500,000 in Texas research wages.
• $200,000 in non-depreciable supplies (prototyping materials).
• $300,000 in contract research paid to a Texas university.
• Total Year 4 Texas QREs: $2,000,000.
• AeroTex’s total franchise tax liability (pre-credit): $150,000.

Step 1: Establish the Base Amount

The base amount is 50% of the average QREs from the preceding three years.

Average QRE = (800,000 + 950,000 + 1,250,000) / 3 = 1,000,000

Base Amount = 0.50 × 1,000,000 = 500,000

Step 2: Calculate the Incremental QRE

Incremental QRE = 2,000,000 (Current) – 500,000 (Base) = 1,500,000

Step 3: Apply the Credit Rate (Subchapter M)

Under Section 171.653(a)(1), the standard rate is 5%. However, because AeroTex contracted with a Texas institution of higher education, it may qualify for an enhanced rate of 6.25% on the entire increment if all conditions are met.

Total Credit = 1,500,000 × 0.0625 = 93,750

Step 4: Apply the 50% Limitation

Under Section 171.654, the credit claimed cannot exceed 50% of the franchise tax due.

Max Credit for Year 4 = 150,000 × 0.50 = 75,000

Step 5: Carryforward Management

AeroTex claims a $75,000 credit on its report. The remaining balance ($93,750 – $75,000 = $18,750) is carried forward. Under Section 171.655, this carryforward can be used for up to 20 consecutive reports.

The Paradigm Shift: Senate Bill 2206 and the Future of R&D in Texas

The definitions in Section 171.651 and the entire framework of Subchapter M are nearing their expiration. Senate Bill 2206, signed into law in June 2025, completely replaces the existing system effective January 1, 2026. This legislation represents the most significant change to Texas R&D incentives in over a decade.

Repeal of Subchapter M and Introduction of Subchapter T

SB 2206 repeals Subchapter M and Section 151.3182 (the sales tax exemption). In their place, it creates Subchapter T, which offers a permanent, significantly enhanced franchise tax credit.

The new law addresses many of the “pain points” associated with Section 171.651. Most importantly, it moves away from the 2011 IRC fixed-date conformity for the purpose of identifying expenses. Instead, it ties “qualified research expenses” directly to the amount reported on Line 48 of IRS Form 6765. This “rolling conformity” eliminates the need for taxpayers to perform separate, state-specific factual determinations of whether their research is “innovative” enough for Texas, as long as it qualifies for the federal credit and is conducted in the state.

Comparison of New Credit Rates and Provisions

The Power of Refundability for Startups

The most transformative aspect of the new regime is refundability. Under Section 171.651 and Subchapter M, many startups engaged in high-intensity R&D were unable to use their credits because they were not yet profitable and had no franchise tax liability. They had to settle for a 20-year carryforward that might never be fully realized.

Starting in 2026, if an entity incurs QREs during a period for which it is not required to pay franchise tax (such as those under the “no tax due” threshold of $2.65M), it can receive the credit as a cash refund. For these refundable credits, the 50% tax liability cap does not apply. This makes the Texas credit one of the most attractive in the nation for early-stage technology companies and new veteran-owned businesses.

Transitioning from Subchapter M to Subchapter T

Taxpayers must carefully manage the transition between these two statutory regimes. Unused credits created under Subchapter M (using the Section 171.651 definitions) do not disappear; the legislation allows them to be carried forward for their original 20-year lifespan. However, when a taxpayer has both old and new credits, the “old” credits (Subchapter M) must be used first to reduce tax liability before the “new” (Subchapter T) credits can be applied.

This order of application is critical for financial planning. Because the new Subchapter T credits are tied to federal reporting forms, they are likely to be more resilient to state-level audits regarding the “nature” of the research, although the “conducted in Texas” requirement remains a primary focus for the Comptroller.

Final Thoughts: Navigating the Complexities of Texas Innovation Policy

Texas Tax Code Section 171.651 established a sophisticated, if sometimes friction-filled, framework for incentivizing research and development. By linking state definitions to a specific moment in federal tax history (December 31, 2011), the Legislature created a stable but rigid incentive that required extensive administrative interpretation by the Comptroller. The resulting body of guidance, notably Rule 3.599 and recent policy memoranda, has created a rigorous environment where documentation and adherence to specific “technological nature” tests are paramount.

The shift represented by Senate Bill 2206 indicates a legislative recognition that the factual determinations required under Section 171.651 were becoming overly burdensome for both taxpayers and the revenue office. By moving toward rolling federal conformity and a refundable model, Texas is signaling a new era of innovation policy—one that prioritizes simplicity, administrative efficiency, and direct support for pre-revenue startups. For the professional peer, the strategic imperative is clear: maximize the value of existing Subchapter M credits through robust documentation while preparing internal systems to capture the significantly higher, refundable benefits of the Subchapter T era beginning in 2026. The evolution of these definitions from Section 171.651 to the new Subchapter T ensures that Texas remains a premier destination for global research and development.