Businesses that invest in research and development may encounter two tax concepts that sound similar but work very differently: the R&D tax credit and the R&D tax deduction. Both relate to research and development spending, but they are not interchangeable. They operate under different sections of the tax code, affect a business's taxes differently, and have different qualification rules.

Manufacturing clients are among the strongest candidates for the federal R&D tax credit, yet many never claim it. The work that qualifies often looks like everyday operations: engineers refining a product, a production team automating a line, or a quality group testing new materials to cut scrap. For CPAs, that creates an opportunity to deliver real value by recognizing qualifying activity early. This guide covers which manufacturing activities and expenses may qualify, how the Four-Part Test applies, what documentation matters, and the questions that can help uncover R&D opportunities with your clients.

"Does my business qualify for the R&D tax credit?" — this guide breaks down the IRS 4-part test, what counts as a business component, and which expenses qualify.