The Process of Experimentation
Understanding the core engine of the R&D Tax Credit. It is not enough to achieve a result; the method of getting there is what qualifies the claim.
Context: The 4-Part Test
To qualify for the R&D tax credit, an activity must satisfy all four parts of the IRS "4-Part Test." While the first three (Permitted Purpose, Technological in Nature, Elimination of Uncertainty) are crucial, the Process of Experimentation is widely considered the most difficult to substantiate during an audit.
The "Process of Experimentation" requires that the taxpayer evaluate alternatives to eliminate technical uncertainty. This process must be scientific in nature—involving hypotheses, testing, and analyzing results. Simple trial and error is not enough; the method must be systematic.
Why it matters:
of disallowed claims fail due to lack of substantiated experimentation.
The 4-Part Test Structure
Hover segments to see definitions
The Anatomy of a Qualified Process
Mere "tinkering" does not qualify. The IRS requires a systematic approach. Click the stages below to understand the requirements for each phase of the cycle.
1. Identify Uncertainty
2. Formulate Alternatives
3. Test & Analyze
4. Refine & Document
1. Identify Uncertainty
The process begins when you establish that the information available to you is insufficient to develop or improve the business component. Note: The uncertainty must be technical (capability, methodology, or design), not just aesthetic or financial.
"Did you know at the outset exactly how to achieve the result?"
Case Study: Software Optimization
Let's look at an example involving a database query latency issue. The distinction between standard debugging and a Qualified Process of Experimentation is subtle but critical.
The "Routine" Approach
- Found a bug in the code.
- Googled the error message.
- Applied a known patch from StackOverflow.
- Problem solved immediately.
Audit Success Probability
Routine debugging rarely meets the "High Threshold of Innovation" standard.
Next Steps: Substantiating the Process
To clarify and explain the Process of Experimentation more fully in your claim, you must focus on contemporaneous documentation. Use the tool below to estimate your current "Audit Readiness."
Documentation Score
Select the artifacts you currently preserve:
Select items to assess your process clarity.
The Process of Experimentation Under IRC § 41: Legal Mandate, Judicial Interpretation, and Advanced Compliance Strategies
Executive Summary: The Mandate and Meaning of the Process of Experimentation
The Process of Experimentation (POE) is a mandatory requirement under the Internal Revenue Code (IRC) Section 41 and its accompanying Treasury Regulations, serving as the third component of the critical four-part test that defines qualified research for tax credit purposes.1 Legally, IRC § 41(d)(1)(C) mandates that “substantially all” of the taxpayer’s activities related to developing or improving a business component must constitute elements of a process of experimentation aimed at achieving a new or improved function, performance, reliability, or quality.3 Treas. Reg. § 1.41-4(a)(5) clarifies that this process must be systematic, designed to evaluate alternatives, and must involve three essential steps: (1) identifying the specific uncertainty concerning the capability or methodology of the development, (2) identifying one or more alternative solutions intended to eliminate that uncertainty, and (3) systematically evaluating those alternatives through methods such as modeling, simulation, or structured trial-and-error methodology.4 This regulatory structure fundamentally serves as a compliance filter, ensuring that tax credits are exclusively claimed for efforts that rely on measured scientific methodology to resolve technical unknowns, thereby excluding routine engineering, design adaptation, or commercial activities.6
The importance of a demonstrable POE cannot be overstated, particularly in the context of IRS scrutiny and recent judicial precedent. The POE establishes the qualitative basis for a research claim, requiring taxpayers to prove how they sought to eliminate technical uncertainty, rather than merely asserting that a complex problem was solved.2 Activities that fail to document a systematic approach—for instance, making design decisions or selecting options without tracking the evaluation of alternatives—are routinely rejected by the Tax Court.8 The legal system requires that documentation reflect the rigorous application of the scientific method, focusing on the methodology used to resolve the uncertainty rather than the eventual success of the project. For example, a qualified POE occurs when a programmer designs a new user interface (UI) to minimize customer clicks during an order process, systematically tracking and analyzing real-life data to incrementally revise the UI design until the functional uncertainty is resolved.9 Conversely, time spent compiling finalized technical data solely for mandatory regulatory submissions, such as those required by the FDA, is explicitly excluded because it involves data organization rather than contributing a scientific or technological element to the research process.6
1. The Statutory and Regulatory Architecture of the Process of Experimentation
The Process of Experimentation is deeply integrated into the legislative and regulatory framework governing the research and development (R&D) tax credit. Its design ensures that the credit is narrowly applied to genuine scientific inquiry rather than common business practice.
1.1 Placement within the Four-Part Test (IRC § 41(d))
Qualification for the R&D tax credit relies strictly upon satisfying the mandatory four-part test defined in IRC § 41(d).2 The POE acts as the procedural core of this test, bridging the goal (Permitted Purpose) and the required intellectual foundation (Technological in Nature) by demonstrating the systematic approach used to tackle the core technical challenge (Technological Uncertainty).1 Failure to satisfy the systematic methodology inherent in the POE invalidates the entire claim for the activities related to that business component.
1.2 Deconstructing the Three-Pronged Regulatory Requirement (Treas. Reg. § 1.41-4(a)(5))
Treasury Regulation § 1.41-4(a)(5) mandates a detailed structure for the POE, which taxpayers must follow and document. The process is defined by three interconnected prongs 4:
- Prong 1: Identification of Uncertainty: The research activity must begin by clearly defining a technical uncertainty related to the capability, methodology, or appropriate design of the intended development or improvement.4 This explicit identification ensures that the activity is rooted in discovery rather than routine application of known principles.
- Prong 2: Identification of Alternatives: Following the identification of uncertainty, the taxpayer must formulate and document one or more specific alternatives intended to resolve the defined uncertainty.4 If a standard solution can be selected from existing knowledge, alternatives are unnecessary, and the activity fails to meet the POE standard.
- Prong 3: Systematic Conduct and Evaluation: This is the core execution phase, requiring the evaluation of the identified alternatives through demonstrably scientific methodologies.4 The evaluation can involve theoretical means, such as computer modeling and simulation, or empirical methods like systematic trial-and-error.9 This systematic evaluation must align with the scientific method—involving the formation of hypotheses, conducting tests, analyzing the resulting data, and drawing objective conclusions regarding the alternatives.9
Table Title
| Element | Description | Associated Uncertainty |
| Identification of Uncertainty | Defining the capability, methodology, or appropriate design not known or determinable at the outset.4 | Capability or Methodology |
| Identification of Alternatives | Proposing one or more specific solutions intended to eliminate that uncertainty.4 | Design or Process Alternatives |
| Systematic Evaluation | Conducting testing, modeling, simulation, or trial-and-error to validate or disprove alternatives.4 | Resolution of Uncertainty |
1.3 The Critical ‘Substantially All’ Standard
A demanding standard is set by IRC § 41(d)(1)(C), which requires that “substantially all” of the activities associated with the business component must constitute elements of the POE.3 This threshold prevents taxpayers from claiming the credit for the entire cost of a complex project when only a minor portion of the work involved true experimentation. If, for instance, a project’s total labor hours are dominated by routine tasks such as administrative duties, project management, or non-technical drafting, the majority of the expenditures (Qualified Research Expenses or QREs) would not be tied directly to the experimentation steps (Prongs 1-3). In such a scenario, the claim would fail the “substantially all” requirement, demonstrating that the POE acts as a legal mechanism to tightly restrict the credit to only the costs genuinely incurred in scientific effort.3 Furthermore, the focus of the test is purely methodological; the POE centers entirely on the systematic procedure used to resolve the uncertainty, not whether the outcome was successful. Even a project that ultimately fails to achieve its commercial or technical goal still qualifies for the credit, provided the activities meticulously followed the three prongs of the POE to discover information and test alternatives.5
2. Judicial Precedent: Defining Systematic Evaluation and Risk Mitigation
Recent Tax Court decisions have significantly heightened the evidentiary burden for taxpayers, making the Process of Experimentation a primary point of focus during audits and litigation. These rulings clearly define the boundary between qualified experimentation and disqualified routine professional activity.
2.1 The Critical Distinction: Experimentation vs. Routine Design
The courts consistently distinguish between research activities that are truly exploratory and those that are merely routine adaptations of existing principles. Highlighting the rigor required, judicial opinions confirm that merely complying with mandatory industry standards, such as adherence to basic building codes, is insufficient to meet the definition of qualified research.8 Moreover, even highly complex design phases or procedures inherent in a professional field, such as the American Institute of Architects (AIA) design phases, do not inherently reflect a systematic POE if they cannot be substantiated with documented evaluation of specific technical alternatives.8
2.2 Case Study Deep Dive: The Phoenix Design Group Standard
The 2024 Tax Court memorandum in Phoenix Design Group, Inc. v. Commissioner provides a critical examination of POE documentation failure.11 The multidisciplinary engineering consulting firm, PDG, was denied all claimed R&D credits because it failed to demonstrate that “substantially all activities” related to the business components constituted a systematic process of experimentation.8
A primary failure noted by the court was the lack of detail tying specific employee activities to the resolution of technical uncertainties. For instance, engineers working on complex projects revised designs and issued updated drawings; however, the firm offered “no explanation of why or how these revisions addressed uncertainties” through a systematic evaluation.8 The court found that activities, such as designing an HVAC system for a laboratory, were merely “routine design adaptations” necessary for the project, not elements of a POE, because uncertainties were neither clearly defined nor systematically resolved through alternative testing.8 The evidentiary record showed that PDG employees recorded time using “generic narratives” without explicitly linking their labor to the technical uncertainties resolved or the specific alternatives evaluated, a flaw the court deemed “fatal” to their claim. The legal interpretation here is that the courts are highly skeptical of claims where professional problem-solving, common in fields like engineering, is retrospectively recast as R&D without the required structured evidence.8 The burden of proof, therefore, rests entirely on the taxpayer to present contemporaneous documentation reflecting the structured process of identifying and testing alternatives (Prongs 2 and 3 of the POE), rather than relying on generalized assertions of professional competence.
2.3 Lessons from Documentation Failures (Little Sandy Coal and Moore)
Other significant decisions, including Little Sandy Coal and Scott Moore, reinforce the paramount importance of documentation. In both cases, the Tax Court sided with the IRS, highlighting the inadequacy of taxpayer documentation to support the experimentation process and link specific employee actions to qualified research activities.12 These cases collectively demonstrate that the legal threshold for the POE is an evidentiary one. It is not enough that a technical uncertainty existed; the taxpayer must prove they followed the systematic three-pronged process to resolve it. Consequently, the reliance on retroactive justification for generic time entries has become an unacceptable risk under current audit scrutiny.7
3. Practical Application and Qualification Benchmarks
The POE requirement can be satisfied through various systematic methodologies, provided they embody the core principle of evaluating alternatives to eliminate uncertainty, which is the heart of the scientific method.9
3.1 Modeling, Simulation, and Iterative Experimentation (Theoretical)
For projects where physical testing is impractical or costly, the POE can be satisfied through theoretical means, such as modeling and simulation. This is defined as iterative experimentation, where alternatives are incrementally revised based on results obtained from theoretical testing.9
For instance, consider a textile company developing an insulating, lightweight tote bag where the optimal insulation volume is unknown. Engineers may use computer-assisted design (CAD) software to create an initial design and then model the bag’s thermal behavior and weight profile. Based on these theoretical results, the engineers systematically create and model alternative designs to better balance insulation volume and weight, thereby demonstrating a qualified POE through structured, iterative evaluation.9 The use of simulation and modeling is explicitly recognized in the regulations as a valid method for systematic evaluation.10
3.2 Systematic Trial-and-Error Methodology (Empirical)
Alternatively, experimentation can rely on empirical results derived from real-life testing or prototyping, known as systematic trial-and-error.9
A clear example of this is found in software development. If a programmer designs a new user interface (UI) for a web application with the goal of minimizing the average number of clicks required for a customer to complete an order, they are resolving a functional uncertainty. The programmer launches the website and tracks empirical data on customer interaction. The systematic process involves revising the UI design based on these measured real-life results to improve the application’s functionality. This structured revision based on empirical data analysis adheres to the scientific method (hypothesis, testing, analysis, conclusion) and constitutes a qualified POE.9
3.3 Contrasting Qualified POE Activities with Excluded Activities
The POE requirement serves as the quality control mechanism, ensuring that technological activities adhere to systematic evaluation principles and are not merely standard business or commercial processes.6 Activities that fail to meet this standard include:
- Regulatory Data Compilation: Activities focused solely on organizing and compiling data necessary for regulatory body submissions, such as those required by the FDA, are excluded. The IRS views this as organizational data gathering, not a scientific contribution to the research process itself.6
- Commercial Activities: Expenditures for consumer surveys, market research, or activities related to advertising and promotion are non-qualifying because they are commercial in nature and distinct from the technological discovery process.6
- Routine Selection: The making of mere design decisions or the selection of options when faced with an issue, without the documented systematic evaluation of alternatives, fails the POE test.8
4. Documentation and the Compliance Paradigm Shift
Due to increased IRS scrutiny and adverse court rulings, the documentation standard for POE has shifted from retrospective justification to a proactive compliance paradigm demanding upfront transparency.
4.1 The New Era of Disclosure: Form 6765 and IR-2021-203
The Internal Revenue Service (IRS) formalized increased compliance expectations through News Release IR–2021–203, affecting claims filed after January 10, 2022, and reinforced by subsequent updates to Form 6765, Credit for Increasing Research Activities.7 This “new era of disclosure” requires taxpayers claiming the credit to provide certain elements at the time of filing, which directly substantiate the existence of qualified research. The required elements, which serve as foundational evidence for the POE, include: identification of all business components related to the credit and a detailed description of the research activities performed for each component.7
4.2 IRS Compliance Reframing: The What, Why, and How Much
The IRS has streamlined its compliance focus, essentially distilling the four-part test into three pragmatic inquiries: “What did you make?”, “Why is it qualified?”, and “How much did it cost?”.7
The POE narrative is critical to answering the “Why is it qualified?” inquiry. Taxpayers must articulate the technical uncertainty and the systematic experimentation used to eliminate it.7 This demand for transparent articulation reinforces the need for contemporaneous documentation; documentation must be integrated into the development process to clearly link specific expenses (QREs) to the three steps of the POE.11 The documentation standards must be sufficiently granular to withstand audit scrutiny, explicitly documenting the “why” and “how” of revisions, a key failing highlighted in judicial precedent.8 Therefore, the legal mechanism of the POE forces documentation to be an inherent part of the operational R&D workflow (e.g., design review logs, change orders), rather than being compiled years after the fact.
5. Recommendations: Next Steps for Clarification and Optimized Use
To further clarify and explain the Process of Experimentation and ensure taxpayers can utilize the R&D credit effectively while mitigating audit risk, actions are required from both taxpayers and regulatory bodies.
5.1 Internal Compliance Optimization for Taxpayers (Advanced Strategy)
Taxpayers should implement structural changes to ensure that the three prongs of the POE are documented systematically and contemporaneously, thereby proactively addressing the judicial demand for evidentiary proof:
- Mandatory Project Charters and Uncertainty Logs: At the inception of any project intended for R&D credit, a formal document must be mandated. This document should specifically identify the technical uncertainties (POE Prong 1) and list the alternative solutions planned for systematic evaluation (POE Prong 2). This proactive documentation ensures regulatory adherence from the start.
- Granular Activity and Time Tracking: Time-tracking systems must be enhanced to force employees to tag their time entries not merely to a generic project code, but to the specific technical uncertainty being resolved or the alternative being evaluated (POE Prong 3). This step directly addresses the issue of “generic narratives” cited as a fatal flaw in recent Tax Court cases, establishing a defensible link between labor costs and the systematic process.8
- Formal Technical Review Documentation: Taxpayers should institute required technical memos or formal reports upon the completion of significant design iterations, testing phases, or modeling runs. These documents must explicitly detail how the testing or modeling was conducted, why certain alternatives were validated or rejected, and what specific uncertainty was resolved. This links the QREs directly to the systematic evaluation process.
5.2 Recommendations for External Regulatory Clarification (Policy Suggestion)
To provide certainty and aid compliance in complex industries, regulatory bodies should refine and expand guidance on the boundaries of the POE:
- Advocacy for Industry-Specific POE Guidance: There is a persistent need for the IRS and Treasury to issue formal technical guidance, potentially through Revenue Rulings or updated Audit Technique Guides (ATGs), that delineates where “routine design adaptation” ends and a qualified POE begins in sectors that frequently struggle with this distinction, such as general engineering, architecture, and advanced manufacturing.8 This clarification would reduce ambiguity and litigation risk.
- Codification of Modern Methodologies: The definition of “systematic trial-and-error” should be expanded or explicitly detailed to cover rapid, iterative development methodologies (e.g., Agile, DevOps) common in modern software and technology development. Issuing safe harbor guidance confirming that documented testing cycles inherent in these systems meet the three regulatory POE prongs, provided they track resolution of specific technical uncertainties, is essential for reflecting current industry practice.9
Table Title
| Stakeholder | Recommendation | Justification |
| Taxpayer/Company | Implement mandatory project-level contemporaneous documentation linking time/expense to specific uncertainty resolution. | Direct mitigation of risks cited in Phoenix Design Group regarding lack of detailed narratives and failure to meet the ‘substantially all’ standard.8 |
| IRS/Treasury | Issue formal technical guidance (e.g., FAQs or Revenue Rulings) with clear, detailed industry-specific POE examples. | Provides necessary clarity where “routine” activities blur with “experimentation” (e.g., engineering, software), reducing litigation risk.8 |
| Taxpayer/Company | Integrate R&D credit capture into the standard product development lifecycle (e.g., Agile sprints, change orders). | Ensures the required POE documentation is generated naturally during the development, not retroactively (contemporaneous standard).7 |
| Taxpayer/Company | Conduct internal R&D credit training focused specifically on the distinction between complex design decision-making and systematic evaluation of alternatives. | Addresses the root cause of failure in engineering firms, where routine professional competence is often mistakenly classified as qualified research.8 |
Are you eligible?
Why choose us?
Pass an Audit?
What is the R&D Tax Credit?
The Research & Experimentation Tax Credit (or R&D Tax Credit), is a general business tax credit under Internal Revenue Code section 41 for companies that incur research and development (R&D) costs in the United States. The credits are a tax incentive for performing qualified research in the United States, resulting in a credit to a tax return. For the first three years of R&D claims, 6% of the total qualified research expenses (QRE) form the gross credit. In the 4th year of claims and beyond, a base amount is calculated, and an adjusted expense line is multiplied times 14%. Click here to learn more.
Never miss a deadline again
Stay up to date on IRS processes
Discover R&D in your industry
R&D Tax Credit Preparation Services
Swanson Reed is one of the only companies in the United States to exclusively focus on R&D tax credit preparation. Swanson Reed provides state and federal R&D tax credit preparation and audit services to all 50 states.
If you have any questions or need further assistance, please call or email our CEO, Damian Smyth on (800) 986-4725.
Feel free to book a quick teleconference with one of our national R&D tax credit specialists at a time that is convenient for you.
R&D Tax Credit Audit Advisory Services
creditARMOR is a sophisticated R&D tax credit insurance and AI-driven risk management platform. It mitigates audit exposure by covering defense expenses, including CPA, tax attorney, and specialist consultant fees—delivering robust, compliant support for R&D credit claims. Click here for more information about R&D tax credit management and implementation.
Our Fees
Swanson Reed offers R&D tax credit preparation and audit services at our hourly rates of between $195 – $395 per hour. We are also able offer fixed fees and success fees in special circumstances. Learn more at https://www.swansonreed.com/about-us/research-tax-credit-consulting/our-fees/
Choose your state
