A common question from manufacturers is whether fastening and joining method development can qualify as research and development for the federal R&D tax credit under Section 41. The short answer is that fastening and joining method development may constitute qualified research when the work evaluates alternative methods to resolve a technical uncertainty about joint performance. Selecting known fasteners from a catalog for a known application generally is not qualified research. This page explains the framework in general terms. It is educational and is not individualized advice. For the foundational framework, see our page on qualified research.
When Fastening and Joining Development May Warrant Review
Fastening and joining method development may warrant review when the work involves a genuine technical uncertainty and a process of experimentation. Under the four-part test, the work must be for a permitted purpose, be technological in nature (relying on engineering or materials science), be intended to eliminate uncertainty, and be conducted through a process of experimentation.
Common scenarios that may warrant review include:
- Joint strength uncertainty — evaluating alternative fastening or joining methods to resolve uncertainty about whether a joint can achieve the required strength.
- Joint reliability — testing alternative methods to resolve uncertainty about whether a joint can maintain performance over the required life under operating conditions.
- Material compatibility — evaluating alternative methods to resolve uncertainty about whether dissimilar materials can be joined without galvanic or chemical issues.
- Access and space constraints — testing alternative methods to resolve uncertainty about whether a joint can be made in a space-constrained area.
Selecting Known Fasteners vs. Method Development
A central distinction is between selecting known fasteners and developing new joining methods:
- Selecting known fasteners — choosing standard fasteners from a supplier catalog for a known application with established performance. There is no technical uncertainty. This is procurement, not research.
- Method development — developing a new fastening or joining approach where there is a technical uncertainty about whether the method can achieve the required performance, and evaluating alternatives to resolve that uncertainty. This may warrant review.
Hypothetical Example
Consider a manufacturer that is developing a new product that requires joining two dissimilar metals in a space-constrained area and is uncertain whether any available method can achieve the required joint strength without galvanic corrosion. The company evaluates alternative joining methods (mechanical fasteners, adhesive bonding, friction stir welding), tests each for strength and corrosion resistance, and systematically varies the approach to resolve the uncertainty. This systematic evaluation of alternatives may warrant review as qualified research.
By contrast, if the same manufacturer selects standard bolts from a catalog for a known application, that is procurement, not research.
This example is illustrative only and does not state that the activity definitely qualifies.
Documentation That May Help
Records that can help support fastening and joining development claims include joint design records identifying the uncertainty and alternative methods, joint-strength test results, corrosion or reliability test data, and records of how results informed method selection. For more, see our page on R&D tax credit documentation.
Key Takeaway
Fastening and joining method development may constitute qualified research when the work evaluates alternative methods to resolve a technical uncertainty about joint performance. Selecting known fasteners from a catalog for a known application generally is not qualified research. Because the distinction is fact-specific, professional review is appropriate before claiming the credit.