Structural Engineering and the R&D Tax Credit: Qualifying Activities, Common Challenges, and Missed Opportunities

Many structural engineering firms assume the Research & Development tax credit only applies to software developers, laboratories, or manufacturers creating physical products. In reality, structural engineering firms often perform highly technical work that can qualify for the federal R&D tax credit under IRC §41.

The challenge is not whether structural engineers perform qualified activities. The challenge is properly identifying, documenting, and defending those activities under the tax code’s requirements.

This article outlines common structural engineering activities that may qualify, where firms often run into hurdles, and what the IRS typically expects to see.

Why Structural Engineering Often Fits the R&D Credit

Structural engineering is fundamentally an exercise in technical problem solving under uncertainty. Engineers regularly evaluate competing design alternatives, perform iterative calculations, address site-specific constraints, and develop solutions that must satisfy building codes, safety requirements, constructability concerns, and owner objectives simultaneously.

Those are all characteristics commonly associated with qualified research activities.

To qualify, activities generally must satisfy the IRS Four-Part Test:

1. The activity must relate to a permitted purpose.

2. The activity must be technological in nature.

3. The activity must involve technical uncertainty.

4. The activity must involve a process of experimentation.

Structural engineering projects frequently meet these standards when firms are designing or refining structural systems rather than merely reproducing established designs.

Structural Engineering Activities That May Qualify

Structural System Design and Optimization:

One of the most common qualifying activities involves evaluating and refining structural systems to achieve performance objectives while balancing cost, load requirements, material limitations, and constructability.

Examples include:

• Designing long-span framing systems

• Developing lateral force resisting systems

• Wind and seismic load analysis

• Optimizing steel, concrete, or timber member sizing

• Evaluating foundation alternatives

• Designing structures for difficult soil conditions

• Specialty structural support systems

• Transfer girders and complex load paths

• High-rise structural analysis

• Structural systems for irregular architectural geometries

In many cases, engineers evaluate multiple alternatives before arriving at a final design. That iterative process is often central to qualifying.

Seismic and Wind Engineering

Projects in high seismic or hurricane-prone regions frequently involve substantial technical uncertainty.

Qualifying activities may include:

• Nonlinear structural analysis

• Performance-based seismic design

• Wind tunnel coordination and analysis

• Dynamic response modeling

• Drift and deflection optimization

• Connection detailing for extreme loading conditions

• Seismic retrofit methodologies

These projects often require iterative modeling and calculations that go well beyond routine application of code tables.

Complex Foundation Engineering Coordination

Structural firms commonly coordinate with geotechnical engineers to address challenging subsurface conditions.

Potential qualifying activities include:

• Deep foundation analysis

• Mat foundation optimization

• Pile system evaluation

• Settlement mitigation strategies

• Retaining wall system development

• Ground improvement coordination

• Designing around expansive or unstable soils

When structural engineers are evaluating alternative approaches to solve geotechnical and load transfer challenges, those efforts may qualify.

Existing Building Renovation and Adaptive Reuse

Adaptive reuse projects frequently create substantial technical uncertainty because engineers must work within incomplete or unpredictable existing conditions.

Examples include:

• Reinforcing aging structures

• Integrating new loads into existing framing

• Historic building preservation constraints

• Unknown material properties

• Structural modifications during tenant improvements

• Seismic retrofits

• Vertical additions on existing structures

Existing buildings rarely behave exactly as drawings suggest, which often requires iterative engineering judgment and redesign throughout the project lifecycle.

Specialty Connection and Detailing Design

Connection design can involve significant engineering complexity, especially for custom or atypical applications.

Potentially qualifying work may include:

• Moment connection development

• Custom steel connection design

• Heavy industrial connection systems

• Modular construction interfaces

• Blast-resistant detailing

• Progressive collapse mitigation

• Unique anchorage systems

The more project-specific and technically uncertain the connection challenge becomes, the stronger the potential R&D position generally is.

Computational Modeling and Advanced Analysis

Many structural firms now rely heavily on advanced analytical software and custom modeling approaches.

Examples include:

• Finite element analysis (FEA)

• Parametric structural modeling

• Nonlinear modeling

• Computational load path analysis

• Structural vibration analysis

• Progressive collapse simulation

• Performance modeling for unconventional structures

Even when commercial software is used, the engineering process surrounding model development, refinement, assumptions, interpretation, and iteration may qualify.

Taking the Next Step

Many structural engineering firms perform qualifying R&D activities every day without realizing it. Complex structural analysis, iterative design work, seismic engineering, adaptive reuse projects, and advanced modeling efforts can all create meaningful tax credit opportunities when properly documented.

At the same time, the rules surrounding the R&D credit have become more technical, and proper project evaluation matters more than ever.

If your firm has never explored the credit, or if your current approach has been overly conservative, it may be worth taking a closer look. Contact us to schedule a complimentary consultation to discuss your firm's situation.