R&D Tax Credits for Aerospace and Aviation 2026: What Qualifies

The aerospace and aviation industry is one of the most R&D-intensive sectors in the U.S. Companies spend years developing new airframes, testing composite materials, validating avionics systems, and refining manufacturing processes.

Aerospace R&D tax credits 2026 reward this work. Here is what qualifies and how to document it.

Important note on Section 174 expensing: The restoration of Section 174 expensing via the 2025 federal legislation means domestic R&D costs are once again 100% immediately deductible in the year incurred. Domestic research no longer requires 5-year amortization. (Note: Foreign research expenditures conducted outside the U.S. must still be capitalized and amortized over 15 years).

The Four-Part Test Applied to Aerospace

To qualify, your activities must meet all four IRS requirements under IRC Section 41.

1. Permitted Purpose

Your work must aim to develop or improve a product, process, or software.

Examples:

• Designing a new airframe or wing geometry

• Improving an existing propulsion system

• Developing new composite materials

• Creating custom manufacturing processes

2. Technological in Nature

The work must rely on engineering, materials science, or computer science.

Examples:

• Aerodynamics and structural analysis

• Composite material testing

• Avionics and flight control software development

• Propulsion system engineering

3. Elimination of Technical Uncertainty

You must face uncertainty about capability, method, or design at the project’s outset.

What creates uncertainty:

• Unknown whether a new material can maintain strength with less weight

• Uncertainty about whether a new composite layup technique will pass fatigue testing

• Questions about system redundancy and reliability

• Doubt about manufacturing scalability

4. Process of Experimentation

You must show systematic evaluation through testing, prototyping, or trial and error.

Qualifying activities:

• Design iterations and CAD modeling

• Finite element analysis (FEA) and computational fluid dynamics (CFD)

• Prototype builds and test-stand evaluations

• Non-destructive testing (NDT) validation

Failed experiments count. The IRS rewards experimentation, not just success.

What Qualifies in Aerospace and Aviation

What Does Not Qualify

• Routine assembly work with no design or test changes

• Production using proven methods or off-the-shelf parts

• Sales, finance, marketing, or general admin activities

• Facility upgrades or capital assets not tied to R&D

• Maintenance work unrelated to experimentation

• Funded research: Government-funded or customer-funded R&D where the taxpayer does not retain substantial rights or bear financial risk. This is a common audit trap for aerospace contractors on cost-plus defense contracts.

Understanding aerospace R&D tax credits 2026 also means knowing what does not qualify—routine production, standard manufacturing without uncertainty, and funded research where the taxpayer does not bear financial risk.

Which Expenses Qualify

Section 174 & Section 280C Coordination

Because domestic R&D costs are once again fully expensible in Year 1, businesses need to coordinate their Section 174 deduction elections with IRC Section 280C to ensure they maximize both immediate cash-flow relief and the Section 41 credit. This coordination is particularly important for aerospace and defense contractors with large R&D budgets and complex cost structures.

State Programs for Aerospace Companies

Several states have introduced significant aerospace-specific incentives in 2026.

Louisiana: New Aerospace Incentives (Effective 2026)

Louisiana enacted two new tax incentives for aerospace manufacturing in 2026:

• Sales tax rebate on the purchase, lease, rental, or use of machinery, equipment, materials, supplies, or services used directly in aerospace activities. Purchases on or after July 1, 2026, are eligible.

• Property tax exemption extended to certain aerospace manufacturing establishments.

To qualify, companies must create at least 200 direct full-time jobs and spend at least $1 billion in capital before July 1, 2031.

Michigan: Aerospace Defense Zone Credits (2026-2029)

Michigan’s Senate Bill 557 creates tax credits for businesses located in aerospace defense zones:

Key details:

• Tax years beginning on and after January 1, 2026, through December 31, 2029

• Qualified taxpayers must be designated by the Michigan Strategic Fund

• Primary business activities: defense contracting, aerospace defense, aerospace equipment manufacturing, or other aerospace and defense technology activities

Oklahoma: Aerospace Employee Credit

Oklahoma allows a credit of up to $5,000 per year for qualified employees in the aerospace sector for tax year 2026. The credit increases to $10,000 for tax years 2027 through 2031.

Iowa: Transition to New R&D Credit Program (2026)

Iowa’s uncapped Research Activities Credit (RAC) is repealed effective January 1, 2026. A new IEDA-managed R&D tax credit program replaces it with competitive application and a $40 million annual cap.

Documentation Best Practices

The IRS expects contemporaneous records—not reconstructed studies assembled years later.

What to document:

• Design iterations, CAD files, and version control logs

• Simulation results, bench test data, and rework records

• Time logs for engineers and test personnel

• Prototype material orders and test bed logs

• Engineering change notices (ECNs) and NPI documentation

• Meeting notes, sketches, photos, and testing protocols

How to document it:

• Use project codes to separate R&D from routine production

• Maintain version control for all design and software documentation

• Store all records in organized, accessible format

• Ensure documentation is contemporaneous (created during the work, not reconstructed later)

Section 174 & Foreign R&D Planning: Because domestic R&D costs can now be immediately expensed, businesses no longer face the tax-income squeeze caused by domestic amortization. However, if your aerospace company uses offshore testing facilities or overseas suppliers, those foreign R&D costs must still be amortized over 15 years.

Bottom Line

Aerospace R&D tax credits 2026 are one of the most valuable incentives for an industry that invests heavily in innovation. Airframe design, composite materials development, avionics systems, manufacturing process improvement, and autonomous systems can all qualify.

The combination of restored Section 174 domestic expensing and federal R&D credits under Section 41 makes 2026 one of the most advantageous tax years for aerospace innovation. New state programs in Louisiana, Michigan, and elsewhere add even more value.

Call (844) 463-2400 or email hello@indagotax.com to discuss which activities in your aerospace or aviation company qualify.