Construction contractors claiming Section 41 research credits face layered risk that many credit studies do not fully address. The research must qualify under the four-part test, the contractor must retain substantial rights, and the payment structure cannot fully compensate the contractor for all risk incurred.
In United States v. Grigsby, the Fifth Circuit affirmed disallowance of Cajun Industries’ research credit. The claim failed across multiple dimensions. This is not a documentation failure. It is a structural failure, where genuine development activity can become legally invisible if claim architecture does not align with how the rules operate.
Cajun provides large-scale construction services across the Gulf Coast. The company evaluated several projects for eligibility and filed an amended return claiming credits. The IRS issued a refund, then brought suit to recover it.
The case proceeded using four representative projects involving refinery work and flood control infrastructure. The government prevailed on three independent grounds, any one of which was sufficient to disallow the credit.
The first failure occurred at the business component level. To qualify, research must be tied to a specifically identified product, process, technique, or similar property.
During discovery, Cajun identified products as business components. Later, it argued construction means and methods were process components. The court excluded that shift because it was not disclosed earlier and deprived the government of the opportunity to evaluate it.
When the court reviewed the merits, it found descriptions vague and conclusory and did not identify a specific new or improved construction process.
This reflects a recurring construction claim pattern:
The second failure involved contractual rights. Under the regulations, research is funded if the taxpayer retains no substantial rights in the results.
Three projects contained provisions transferring rights to the client, including works-for-hire treatment, automatic assignment of drawings and engineering data, and federal contract provisions making materials government property upon payment.
Cajun argued it retained value because knowledge could be reused. The court rejected that position, explaining that institutional knowledge does not constitute substantial rights. Rights must exist in the research results themselves.
The fourth project failed under the financial risk analysis. Cajun argued the project was not funded because it operated under a fixed-price structure. The court focused on contract language stating payment represented full compensation for all labor, materials, losses, and risks.
Because claimed wage costs were fully compensated by the contract, the court concluded the expenditures were funded. The decision clarifies that fixed price alone does not establish risk. Risk must remain after considering how the contract allocates compensation.
Grigsby reinforces three structural boundaries:
The deeper implication is practical. Construction claims often describe activity accurately but structure the claim in a way the rules cannot recognize. In that situation, development exists operationally but not legally.
Structural failures typically originate before documentation is assembled.
National Tax Group evaluates claim architecture early by defining business components at the correct level, analyzing contract provisions affecting substantial rights, and assessing whether payment structure leaves meaningful economic risk rather than assuming it does.
TaxDrone.AI preserves the allocation evidence supporting that structure through component-level activity capture, documentation tied to technical decisions and milestones, and cost records aligned to business components rather than projects broadly.
NTG determines whether a position is defensible. TaxDrone.AI preserves the evidence that allows that position to be demonstrated.
Grigsby illustrates a recurring pattern. Claims fail when component definition, contractual rights, and payment structure are evaluated late or in isolation.
A pre-filing defensibility review can clarify:
If a claim depends on assumptions about risk, rights, or component definition, evaluating structure before filing is a practical next step. Construction claims rarely
