A common question is whether materials count for the federal R&D tax credit under Section 41. The short answer is that materials may be taken into account when they qualify as "supplies" — tangible property consumed or used in the conduct of qualified research — but not every material purchase qualifies, and the distinction between experimentation materials and production or resale materials is central. This page explains the framework in general terms. It is educational and is not individualized advice. For the foundational supply rules, see our page on R&D tax credit supplies.
The Supplies Framework
Under Section 41(b)(2)(C), "supplies" are defined as tangible property other than (i) land or improvements to land, and (ii) property of a character subject to the allowance for depreciation. Materials that are tangible property consumed or used in the conduct of qualified research may fall within this category, provided the underlying activity constitutes qualified research and the other requirements are met. The Treasury Regulations under Section 41 (§1.41-2) provide additional detail on in-house research expenses.
Materials Consumed in Experimentation
Materials consumed during experimentation — for example, raw materials tested to evaluate alternatives, materials incorporated into test units, or materials destroyed or used up during testing — may be supplies if they meet the statutory definition and are used in the conduct of qualified research. The key question is whether the materials were consumed in a process of experimentation directed at eliminating a technical uncertainty about a business component. For more on the activity framework, see our page on qualified research.
The Inventory and Resale Distinction
Materials held for resale — inventory that a business purchases or produces for sale to customers — generally are not supplies used in the conduct of qualified research. The supply category addresses materials consumed in the research process, not goods held for sale. Similarly, materials used in commercial production after the research is complete generally fall outside the qualified-research framework. The line between research materials and production inventory can be fact-specific, particularly where the same type of material is used in both research and production.
Production Materials vs. Experimentation Materials
A manufacturer may use the same raw material in both experimentation and commercial production. The analysis generally requires separating the portion used in qualified research from the portion used in routine production. Only the portion consumed in the conduct of qualified research may potentially be taken into account, and a supportable allocation is generally needed. Allocating the full cost of shared materials to qualified research without support generally is not appropriate. For more on allocation, see our page on qualified research expenses.
Materials Used in Material Substitution Testing
A common scenario is material substitution testing — where a company evaluates alternative materials to meet a performance, durability, or cost target. Materials consumed in systematic testing of alternatives may warrant review as supplies, provided the testing constitutes a process of experimentation and the other elements of qualified research are met. For a deeper treatment, see our page on material substitution testing.
Hypothetical Example
Consider a company that manufactures molded plastic components and is uncertain whether a alternative polymer can achieve the required impact-resistance specification. The company purchases small quantities of three alternative polymers, molds test specimens, and subjects them to impact testing. The polymer materials consumed in these tests — tangible property used in the conduct of the experimentation — may warrant review as supplies, provided the underlying activity constitutes qualified research. By contrast, the polymer the company purchases for its normal production runs — materials used to make components for sale — generally would not be supplies for the credit.
This example is illustrative only and does not state that the costs definitely qualify.
What Generally Does Not Fit
Several categories of material costs generally do not fit the supply category:
- Materials held for resale — inventory is not a supply used in qualified research.
- Depreciable property — materials that are capitalized and depreciated are excluded by statute.
- Materials used after commercial production — the commercial-production exclusion may apply.
- General overhead materials — indirect materials not connected to specific qualified research generally are not automatically includable.
- Materials used in routine production — even if the production line encounters problems, routine production materials generally are not supplies for the credit.
Documentation That May Help
Records that can help support material-cost claims include purchase orders, invoices, inventory and usage records, records distinguishing research materials from production materials, and records connecting materials to specific qualified research projects and business components. For more, see our page on R&D tax credit documentation.
Key Takeaway
Materials may be taken into account for the R&D tax credit when they are tangible supplies consumed or used in the conduct of qualified research. Materials held for resale, used in commercial production, or that are depreciable property generally are not supplies, and the distinction between experimentation materials and production materials is central. Because these determinations are fact-specific, professional review is appropriate before claiming the credit.