Process of Experimentation

The Process of Experimentation is a systematic evaluative procedure designed to identify and test technological alternatives to resolve uncertainties regarding a business component's design, method, or capability. Within the Texas Research and Development tax credit framework, it functions as the critical qualitative standard distinguishing qualifying innovation from routine development for franchise tax purposes.

Statutory Foundation and the Evolution of Texas Research Incentives

The Texas Research and Development (R&D) tax credit is established under the Texas Tax Code, Chapter 171, Subchapter M. This legislative framework provides a structured incentive for taxable entities to conduct research activities within the state, offering a credit against the franchise tax based on qualified research expenses (QREs). The evolution of this credit is marked by a transition from a temporary incentive to a permanent pillar of the state’s economic policy, reflecting a broader commitment to fostering a high-tech industrial base.

Historically, Texas provided R&D incentives through two distinct pathways: a franchise tax credit and a sales and use tax exemption for depreciable tangible personal property used in research. Under the prior regime, which remains relevant for audits of historical periods, taxpayers were required to elect one of these two benefits. However, recent legislative developments, specifically Senate Bill 2206 (2025), have fundamentally altered this landscape. Effective for reports due on or after January 1, 2026, the sales tax exemption is repealed, and the franchise tax credit is enhanced and made permanent. This shift was prompted by administrative challenges and a desire to align the state’s definitions more closely with federal standards under Internal Revenue Code (IRC) Section 41.

The administrative oversight of these credits falls under the Texas Comptroller of Public Accounts. The Comptroller’s office provides guidance through the Texas Administrative Code, specifically Rule 3.593, and the State Automated Tax Research (STAR) system. These resources interpret the statutory requirements of Subchapter M, particularly the application of the Four-Part Test used to define qualified research.

Key Legislative Phase	Statutory Authority	Primary Mechanism	Significant Changes
Pre-2014	Subchapter O (Repealed)	Franchise Tax Credit	Repealed Jan 1, 2008; carryforwards expire Dec 31, 2027.
2014 - 2025	Subchapter M (Original)	Choice: Credit or Sales Tax Exemption	Established a 5% credit rate and reliance on 2011 IRC definitions.
2026 and Beyond	Subchapter M (Amended)	Enhanced Franchise Tax Credit	Repeal of sales tax exemption; permanent credit; rate increased to 8.722%.

The Four-Part Test as the Diagnostic Standard for Qualified Research

To qualify for the Texas R&D tax credit, an activity must satisfy the Four-Part Test as defined in IRC Section 41(d) and adopted by Texas Tax Code Section 171.651 and Rule 3.593. This test ensures that the tax benefit is directed toward genuine technical innovation rather than routine business improvements or aesthetic changes.

The Section 174 Test: Requirement of Uncertainty

The first requirement is that the expenditures associated with the activity must be eligible for treatment as expenses 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 or laboratory sense. The core of this test is the existence of "uncertainty". Uncertainty exists if the information available to the taxable entity does not establish the capability or method for developing or improving the product, or the appropriate design of the product.

Recent changes to Section 174 at the federal level, specifically the requirement to capitalize and amortize research expenses over five years rather than expensing them immediately, have created new complexities for Texas taxpayers. However, the underlying definition of research in the experimental sense remains focused on the elimination of technical uncertainty.

The Technological in Nature Test

The second part of the test requires that the research be undertaken for the purpose of discovering information that is "technological in nature". To satisfy this, the process of experimentation used to discover the information must fundamentally rely on principles of the "hard sciences," such as engineering, computer science, physics, biology, or chemistry.

Texas administrative guidance clarifies that a taxpayer does not need to seek information that exceeds or refines the "common knowledge" of skilled professionals in the field. The research merely needs to be new to the taxpayer. Furthermore, a taxpayer does not need to succeed in their research; the intent to discover technological information is sufficient to meet this threshold.

The Business Component Test

Thirdly, the research must be intended to be used in the development of a "new or improved business component". A business component is defined as any product, process, computer software, technique, formula, or invention that is held for sale, lease, or license, or used by the taxpayer in its trade or business. The application of the Four-Part Test is performed at the level of the individual business component.

The Process of Experimentation Test

The final, and often most difficult, part of the test is the "Process of Experimentation" (POE). Substantially all of the activities of the research—defined by Rule 3.593 and Treasury Regulation 1.41-4 as 80% or more—must constitute elements of a process of experimentation. This process must relate to a "qualified purpose," which involves a new or improved function, performance, reliability, or quality of the business component.

Deep Narrative Analysis of the Process of Experimentation

The Process of Experimentation is not merely a synonym for "testing" or "trial and error." It is a specific legal and technical construct that requires a systematic evaluative procedure. The Texas Comptroller, following federal guidelines, defines it as a process designed to evaluate one or more alternatives to achieve a result where the capability, method, or design is uncertain at the beginning of the research activities.

The Evaluative Nature of POE

A true process of experimentation involves several distinct phases. First, the taxpayer identifies the uncertainty. Second, they identify one or more alternatives intended to eliminate that uncertainty. Third, they conduct a process of evaluating those alternatives through modeling, simulation, or a systematic trial-and-error methodology.

The mere existence of uncertainty regarding a design does not prove that all activities undertaken to achieve that design constitute a process of experimentation. For instance, if an engineer is uncertain about the final look of a product but follows a standard, non-evaluative design path to reach the conclusion, they have not satisfied the POE test. The process must be "evaluative" and should generally be capable of evaluating more than one alternative.

The "Substantially All" (80%) Threshold and the Shrink-Back Rule

The "substantially all" requirement is a quantitative barrier that many taxpayers fail during audits. If 80% or more of the research activities for a business component constitute a process of experimentation for a qualified purpose, the test is satisfied for the entire component. If the activities fall below this 80% threshold, the "shrink-back rule" applies.

The shrink-back rule allows the taxpayer to apply the Four-Part Test to the most significant subset of elements within the business component. If the overall product fails the test, the taxpayer may look at a specific sub-assembly or a discrete software module. This process of shrinking back continues until a subset of elements is reached that satisfies the test, or the most basic element is reached and fails. This mechanism prevents the categorical exclusion of an entire project when only a portion of the activities are non-qualifying.

Threshold Type	Requirement	Measurement Basis	Regulatory Reference
Substantially All	80% or more activities must be POE	Cost or other consistently applied reasonable basis	Treas. Reg. § 1.41-4(a)(6); Rule 3.593
Qualified Purpose	New/improved function, performance, reliability, or quality	Functional vs. aesthetic improvement	IRC § 41(d)(3)(A)
Technological Reliance	Must rely on hard sciences	Engineering, CS, Biology, etc.	Treas. Reg. § 1.41-4(a)(4)

Exclusions from the Process of Experimentation

The Texas Tax Code and Administrative Rule 3.593 explicitly exclude several categories of activities from being considered qualified research, even if they involve some degree of technical work.

Activities that do not qualify as POE include:

• Post-Commercial Production Research: Any research conducted after the business component is ready for use or meets the basic functional and economic requirements of the taxpayer. This includes tooling up, trial production runs, and troubleshooting production equipment.
• Adaptation and Duplication: Adapting an existing product to a specific customer's needs or the duplication of an existing product or process.
• Non-Functional Aspects: Research related to style, taste, cosmetic, or seasonal design factors.
• Routine Data Collection: Efficiency surveys, management studies, consumer surveys, and ordinary testing or inspection for quality control.
• Internal-Use Software (IUS): Research relating to software developed for internal administrative use, unless it meets a higher threshold of innovation (the "High Threshold of Innovation" test).

Local State Revenue Office Guidance and Administrative Context

The Texas Comptroller’s administration of the R&D credit has been characterized by significant challenges in recent years, including staffing shortages and a substantial backlog of audits and appeals.

The STAR System and Policy Interpretations

The STAR (State Automated Tax Research) system provides the Comptroller’s interpretation of tax laws. Recent STAR documents and annual briefings indicate a shift in the Comptroller's audit approach. While the Tax Policy Division previously handled most R&D reviews, the volume of requests became so overwhelming that a team from the Comptroller’s headquarters now assists field auditors in reviewing documentation.

A critical takeaway from recent Comptroller briefings is the acknowledgment that "perfect documentation" is rarely available. Consequently, the agency has expanded the types of evidence it will consider to substantiate the POE, including contemporaneous emails demonstrating that testing activity occurred. However, auditors continue to focus heavily on the Four-Part Test, emphasizing that federal approval of an R&D credit is not always conclusive for Texas purposes, as the IRS and the Comptroller may apply different levels of scrutiny to the POE test.

Audit Procedures and the Lifecycle of a Claim

When a taxpayer claims an R&D credit on their franchise tax report (Forms 05-158-A, 05-158-B, and Schedule 05-178), they must be prepared for potential examination. The Comptroller’s audit manual outlines a formal process for these reviews.

The audit typically begins with a "Notice of Audit" and a request for a completed Audit Questionnaire (Form 00-750). During the fieldwork phase, the auditor examines transactions and evaluates the POE by reviewing "contemporaneous" documentation. If the auditor denies the credit, the taxpayer may request a "Reconciliation Conference" with the audit manager or an "Independent Audit Review (IAR)" conference with a third party to attempt to resolve disputes before moving to a formal administrative hearing.

A newer mechanism, the "Hearings Bypass Process," allows taxpayers to move more quickly to District Court if they believe the administrative hearing process will be inefficient, provided a complete record has been developed during the audit.

Documentation and Substantiation of the POE

The burden of establishing the credit rests solely with the taxable entity. Documentation must be "contemporaneous," meaning it must be created as the R&D activity occurs.

The "Innovation Log" as a Best Practice

Consultants and tax experts frequently recommend the use of an "Innovation Log" to prove the POE. This log provides a narrative and technical bridge between the hours billed and the experiments conducted.

Documentation Type	Role in Proving POE	Examples
Innovation Log	Chronological record of technical challenges and fixes	Daily or weekly notes on project failures and subsequent design changes
Testing Protocols	Evidence of a systematic evaluative process	Bench test parameters, stress testing criteria, modeling variables
Records of Analysis	Interpretation of test results to form new hypotheses	Graphs of failure points, comparison matrices of alternative materials
Visual Evidence	Proof that prototypes and testing actually existed	Photographs or videos of physical prototypes and trial runs
Labor Time Sheets	Linking personnel time to specific research projects	Project-coded hours for engineers and developers

Evidence of Systematic Trial and Error

To satisfy the POE test, the records must show that the taxpayer assessed alternative methods for their solution. This is best documented through "failed" tests. If a taxpayer only provides documentation for the successful final design, an auditor may argue that there was no "experimentation" or evaluation of alternatives, but rather a straightforward engineering task. Documentation showing why certain designs were discarded is often more valuable than documentation showing why the final design worked.

Detailed Example: Power Generation in the Texas Energy Sector

The application of the POE test is best illustrated through a high-stakes industry scenario. Consider the case of Ice Thermal Harvesting LLC, a Texas-based firm involved in energy innovation.

Project Background: Waste Heat Recovery at Drilling Rigs

Drilling operations in the Texas oil and gas industry generate massive amounts of waste heat from engine exhaust, cooling systems, and the drilling fluid itself. Historically, this heat was vented, leading to energy inefficiency and environmental impact. Ice Thermal Harvesting sought to develop a system to capture this heat and convert it into electricity using an Organic Rankine Cycle (ORC) unit.

Satisfying the Four-Part Test

Uncertainty (Section 174):

The team faced uncertainty regarding whether a modular, mobile unit could maintain efficiency while handling varying thermal loads from different types of drilling equipment. The "appropriate design" was unknown at the outset because existing ORC units were generally fixed-site and not designed for the rapid deployment and transport required for a mobile drilling rig.

Technological in Nature:

The research relied on principles of mechanical engineering, thermodynamics, and fluid dynamics. The discovery process used these "hard sciences" to model the transfer of heat from mixed-phase streams (liquid and vapor) to the working fluid of the ORC.

Business Component:

The business component was a proprietary power generation system intended for lease or sale to drilling rig operators.

Process of Experimentation:

The firm engaged in a systematic evaluative process. They developed multiple "design alternatives" for the heat exchangers. Through "modeling and simulation," they tested different working fluids to see which provided the best thermal return-on-investment across the diverse temperatures of engine exhaust versus drilling fluid. The engineers maintained "Innovation Logs" documenting failure points where certain materials could not withstand the vibration of the drilling environment, leading them to "refine or discard" those hypotheses and try new structural reinforcements.

By documenting this systematic evaluation of alternatives to resolve the design uncertainty, the company successfully demonstrated the POE requirement. Their work resulted in U.S. Patent No. 12110878, which the IRS and the Texas Comptroller view as conclusive evidence of the discovery of technological information, though the taxpayer still had to substantiate the specific labor and supply costs through contemporaneous records.

Expanded Regulatory Analysis: SB 2206 and the Future of Texas R&D

Senate Bill 2206 represents a pivotal modernization of the Texas R&D Tax Credit regime. By aligning the state credit more closely with federal standards, the legislature has attempted to reduce the administrative burden on both taxpayers and the Comptroller’s office.

Transition to Rolling Conformity

One of the most significant changes is the adoption of "rolling conformity" to the Internal Revenue Code. Previously, Texas law was tied to the IRC as it existed on December 31, 2011. This created a "gap" where new federal regulations or court rulings might not apply to Texas. Under the new law, the credit is directly linked to Line 48 of IRS Form 6765, incorporating current federal definitions and guidance.

Enhanced Rates and Economic Planning

The increase in the allowable credit percentage from 5% to 8.722% provides a 74% boost in the value of the credit for most businesses. For a company with $1 million in qualified R&D expenses above their base amount, the credit jumps from $50,000 to $87,220.

Parameter	Pre-2026 Rules	Post-2026 Rules (SB 2206)
Expiration Date	December 31, 2026	Permanent
Standard Credit Rate	5%	8.722%
University Credit Rate	6.25%	10.903%
Refundability	Carryforward only (20 years)	Refundable for certain small/veteran businesses
Sales Tax Option	Available (must choose)	Repealed
Conformity	IRC as of Dec 31, 2011	Rolling Conformity (Line 48, Form 6765)

Impact on Startups and Small Businesses

The introduction of "refundability" is a significant development for the Texas innovation ecosystem. Startups and small businesses often have significant R&D expenses but no franchise tax liability because they have not yet reached profitability. Under the old rules, these businesses could only carry their credits forward for up to 20 years, providing no immediate cash flow benefit. The new provisions allow these entities to receive their credit as a cash refund, providing vital capital to reinvest in further research.

Mathematical Logic of the Texas Credit Calculation

The Texas credit is not a flat percentage of all R&D spending; it is an incremental credit designed to reward increased investment in research.

Calculating the Base Amount

The "Base Amount" is generally 50% of the average QREs incurred during the three preceding tax periods. This structure ensures that taxpayers are incentivized to grow their R&D footprint in Texas over time.

For an established company, the calculation follows this logic:

1. Average the QREs from the three prior years.
2. Multiply by 50% to find the base.
3. Subtract the base from the current year’s QREs to find the incremental amount.
4. Apply the credit rate (e.g., 8.722% for reports after 2026) to the incremental amount.

The Alternative Simplified Method (ASM)

Texas also allows a version of the Alternative Simplified Method. If a taxable entity has no QREs in one or more of the three preceding tax periods, they may use a reduced flat rate—4.361% under the new law—applied to their total current-year QREs. This is particularly beneficial for new companies or those just beginning their R&D journey in Texas.

Administrative Hearings and Case Law Context

The meaning of "Process of Experimentation" has been further refined by several landmark cases and administrative hearings. While Texas often follows federal precedent, the Comptroller has historically been aggressive in its narrow interpretation of "experimental" vs. "routine."

The Impact of Little Sandy Coal Co. v. Commissioner

Although a federal case, Little Sandy Coal Co. v. Commissioner (2023) has had a ripple effect on Texas R&D audits, particularly regarding production expenses. The court ruled that production activities can be included in the numerator of the 80% "substantially all" test if the taxpayer establishes that those costs constitute elements of a process of experimentation. However, the court upheld the denial of the credit because the taxpayer failed to substantiate that the activities of both production and non-production employees were truly elements of an evaluative process.

For Texas taxpayers, this highlights the danger of grouping all research under a single broad category. The Comptroller requires that research be tied to a specific business component, and the evidence must include a detailed analysis of the R&D activities and associated costs.

Specific Industry Applications of POE Guidance

The Comptroller's guidance varies significantly by industry. In manufacturing, for example, the development of a new shredding blade illustrates the POE. If a standard blade is not commercially available, and the taxpayer engages in a "systematic trial and error process" of analyzing different blade designs and materials to meet functional requirements, this satisfies the POE. However, if the taxpayer simply modifies the painting process for a component by choosing a different color (style or taste), it is excluded.

In the software sector, the case of IVO Tech demonstrates the importance of testing protocols. IVO developed employment screening software and claimed credits for improving processing speeds and storage. Their POE involved "experimentation with possible fixes until an adequate solution was determined" and "executing test cases" across all supported releases to determine exposure. They successfully defended their claim by providing "Innovation Logs," "Records of changes and bug fixes," and "Testing protocols" that proved their work took place in a systematic manner.

Qualitative Synthesis: The Future of R&D in the Lone Star State

The Texas R&D tax credit framework is moving toward a more mature, permanent, and federally aligned structure. However, the fundamental challenge for taxpayers remains the qualitative substantiation of the Process of Experimentation. As the Comptroller works through its "Texas-sized backlog," taxpayers can expect continued focus on the Four-Part Test.

The implications of the 2025 legislative changes are clear: the state is trading the administrative complexity of the sales tax exemption for a more powerful and permanent franchise tax credit. This modernization reflects the state's gamble that stronger R&D incentives will attract more innovative companies and encourage existing businesses to expand their research footprints in Texas.

For the professional tax practitioner or corporate executive, navigating the Texas R&D credit requires a dual focus on quantitative rigor (the 80% test and the incremental calculation) and qualitative storytelling (the Innovation Log and the narrative of uncertainty). By maintaining contemporaneous records that detail the "systematic evaluation of alternatives," businesses can ensure their innovative activities translate into a secure and significant tax benefit.

Final Thoughts

The Process of Experimentation is the indispensable core of the Texas Research and Development Tax Credit. It transforms technical labor into a tax incentive by requiring a structured, evaluative approach to solving technical problems. Through Chapter 171, Subchapter M, and the interpreting guidance of the Texas Comptroller, the state has established a rigorous but rewarding framework for innovation. As the credit transitions into a permanent and enhanced feature of the Texas tax code in 2026, the demand for meticulous documentation and a nuanced understanding of the POE test has never been greater. Whether developing emissions-free power for drilling rigs or optimizing screening software, Texas taxpayers must demonstrate that their path to discovery was paved with systematic alternatives, rigorous testing, and the elimination of technical uncertainty.