Research & Development Tax Credit: A Powerful, Often Overlooked Tool for Contractors

The construction industry is navigating one of its most competitive periods in decades. Rising material costs, volatile supply chains, labor shortages, and tight margins continue to pressure both General Contractors (GCs) and subcontractors such as Heavy Highway, Sitework, and Mechanical, Electrical, and Plumbing (MEP) subcontractors. With interest-rate sensitivity layered on top, firms must leverage every available advantage to stay profitable and win work.

One advantage many contractors already have, but often overlook, is the Research & Development (R&D) Tax Credit. As construction increasingly embraces innovation, from advanced building systems to sustainable technologies and integrated project delivery, these problem-solving activities may qualify for a reduction in federal (and often state) tax liability. Additionally, qualified small businesses with less than $5 million in gross receipts in the current taxable year and no gross receipts prior to the fifth taxable year (e.g., for 2025, the company must not have gross receipts prior to tax year 2021) can use the credit to offset up to $500,000 of their payroll tax liability.

Why R&D Matters in Construction

The IRS recognizes that construction firms routinely engage in activities that require technical problem-solving, experimentation, and innovation. Many of these tasks fall squarely within the definition of qualified research.

Think: customization, optimization, and origination.

Common examples of qualifying activities include:

Designing or engineering unique building systems or structural solutions
Evaluating alternative materials or construction methods
Addressing site-specific challenges through technical problem-solving
Developing energy-efficient solutions or LEED-related innovations
Implementing process improvements to reduce risk or build time

Contractors often perform R&D without realizing it.

A mechanical contractor may be optimizing refrigerant piping or testing new layouts through modeling and field pilots
An electrical contractor designing and refining networked lighting controls for use on future projects
A plumbing contractor engineering roof drainage systems using computational modeling to prevent ponding on complex roof geometries

R&D Project Examples for Numerous Types of Construction Companies

Projects must aim to improve processes, be technological in nature and eliminate uncertainty.

Heavy Highway and Bridge Construction
Designing more efficient bridge erection sequences
Improving shoring, formwork, or falsework designs
Creating processes to reduce construction time or environmental impact
Commercial Contractors
Testing multiple foundation approaches for unstable soil
Designing buildings to withstand Category 5 hurricanes
Electrical Subcontractors
Developing energy-efficient cooling systems for data centers
Creating heating, lighting and power efficiency improvements
Technical issues requiring problem-solving and evaluation of alternative methods or designs (duct routing, load requirements, thermal barriers)

How the IRS Evaluates Qualified Research

To determine whether a construction firm’s activities qualify, the IRS applies a well-established four-part test under IRC Section 41. Work must be:

Technological in nature – relying on engineering or other hard sciences
Intended to eliminate uncertainty – such as uncertainty about design, capability, or methodology
Undertaken through a process of experimentation – modeling, testing, prototyping, or iterative design
Directed at creating a new or improved business component – such as a product, process, technique, or system

Most contractors are surprised by how many of their routine problem-solving tasks meet all four requirements.

What Costs Can Be Included?

Qualified R&D expenditures can be converted into a tax credit for the year they’re incurred. Eligible cost categories include:

Wages for employees performing, supervising (limited to first-line management), or supporting qualified research
Supplies consumed during experimentation (materials, prototypes, components)
Third-party contractor costs, when substantial rights are retained

What Activities Do Not Qualify?

Specific guidelines for the credit include activities that are explicitly excluded:

Routine or Repetitive construction activities
Post-Production performance
Activities once uncertainty has been eliminated
Cosmetic, Aesthetic, or Layout Changes
Quality Control and Routine Testing
Market Research
Funded Research
Duplication or Adaptation without Technical Uncertainty
Foreign Research Activities (work performed outside the U.S.)

Further, a common pitfall to securing the credit is a lack of documentation demonstrating the “process of experimentation”. Demonstration includes showing several design alternatives that were tested, where uncertainties existed and the decision-making behind systematic experimentation.

Example of the R&D Credit Using a Sample Model

Step 1: Identify Revenue and Labor Mix

Construction Firms typically have:

2%-6% of revenue tied to technical problem-solving labor
Higher percentages for MEP, civil, specialty and design-build firms

Step 2: Determine Qualified Labor Pool

A conservative approach:

30%-50% of engineering/technical staff time qualifies

Step 3: Apply Credit Rate

Effective credit rate: 7%-10% (using a market rule of thumb non-statutory rate, federal only)
Payroll tax offset applies if qualified small business (about 7%)

Step 4: Putting it all together

Company Profile:

Revenue: $40 million
Staff: 120 employees
Engineering and Technical W-2 Box 1 Payroll: $6.5 million
Qualifying percentage: 35%
Result: $160,000 credit using a conservative approach

State-Level Benefits

In addition to the federal incentive, many states offer their own R&D credits, often modeled on federal rules. For contractors working across multiple states, coordinated credit strategies can provide significant additional tax savings.

R&D Study Approach and Next Steps

Whether you are a general contractor navigating complex design-build projects or a subcontractor solving engineering challenges in the field, a proactive R&D study can unlock meaningful cash-flow benefits while strengthening internal processes. For construction firms focused on staying competitive in an increasingly demanding marketplace, the next step is not just asking if R&D credits apply—but ensuring they are identified, documented, and maximized in the right way. A team of R&D Tax Credit specialists can determine if you’re eligible for an R&D Tax Credit and provide an estimate of your potential credit benefit.

Reach out to explore how these opportunities may apply to your business and Withum can help assess eligibility, estimate potential credits, and determine the next steps in your process to secure the R&D tax credit.

Author: Torrey Hill, CPA | [email protected]