The work happening in your facility right now may qualify for one of the most valuable tax credits available to American manufacturers, and most shops never claim it.
If your business designs custom tooling, develops new dies, builds specialty machinery, or engineers solutions to production challenges that don’t have off-the-shelf answers, the federal R&D Tax Credit was built for companies like yours. The problem is, most tool and die shops assume innovation has to happen in a lab to count. It doesn’t.
Your shop floor is your lab. And the IRS knows it.
What Is the R&D Tax Credit?
The Research and Development (R&D) Tax Credit, established under Internal Revenue Code Section 41, is a federal tax incentive designed to reward American businesses that invest in developing new products, processes, and technical solutions. Made permanent by Congress in 2015, the credit reduces your federal income tax liability dollar-for-dollar. That’s not a deduction, it’s a direct, dollar-for-dollar reduction in what you owe.
For qualifying businesses, the annual benefit can reach tens or hundreds of thousands of dollars. And if your company hasn’t been claiming the credit, you may be able to amend prior tax returns and recover credits for up to three previous years.
Why Tool, Die & Machinery Companies Often Qualify
Tool and die work is, by its nature, an engineering discipline. Every custom tool, every new die design, every piece of specialty machinery your team builds starts with a technical problem and ends, hopefully, with a solution that works. The path between those two points is exactly what the IRS defines as qualifying research.
Your people don’t wear lab coats. They wear steel-toed boots and run CNC machines. But the process of evaluating design alternatives, testing whether a tool will hold tolerance, or figuring out why a die is cracking at 50,000 cycles is the same kind of systematic technical investigation the R&D Tax Credit was created to reward.
The credit isn’t just for Silicon Valley. It’s for the shops doing hard, precise, technically demanding work that most businesses couldn’t do without you.
The Four-Part Test: Does Your Work Qualify?
The IRS requires qualifying activities to meet four criteria:
1. Business Component: The activity must be aimed at developing or improving a product, process, technique, formula, or software. Custom tooling design, new die development, fixture engineering, and machine building all fit squarely in this category.
2. Technical Uncertainty: There must be genuine uncertainty about whether a design, process, or approach will work at the outset. When your engineers are figuring out how to hold a tolerance that’s never been held before, or whether a new material will perform under production stress, that uncertainty qualifies.
3. Process of Experimentation: The firm must engage in a systematic process of testing and evaluating alternatives, through physical prototyping, trial runs, iterative design changes, or simulation. This is the daily rhythm of most tool and die operations.
4. Technological in Nature: The work must rely on engineering, the physical sciences, computer science, or biology. Metallurgy, mechanical engineering, material science, and machining principles are all technological in nature, and all common in tool and die work.
What Activities Commonly Qualify?
Many of the activities your team performs on a regular basis likely meet the four-part test. Common qualifying activities in the tool, die, and machinery space include:
- Custom tooling design and development: engineering new tools for specific production applications without established precedent
- Die design and engineering: developing stamping, forming, casting, or forging dies to meet new part geometries or tolerances
- Prototype development and testing: building and evaluating first-article tooling to validate performance before full production
- Process development for new materials: figuring out how to machine, form, or process materials your team hasn’t worked with before
- Fixture and jig engineering: designing holding solutions for parts or assemblies that require custom approaches
- Tolerance and performance testing: iterative testing to achieve precision requirements that exceed standard capabilities
- Specialty machine design and build: engineering custom production equipment or automation solutions
- Failure analysis and design iteration: systematic investigation of why a tool or die failed, followed by engineering corrections
- CAD/CAM development: creating novel toolpaths, machining strategies, or CNC programs for new or complex geometries
- Material selection and evaluation: testing new alloys, coatings, or treatments to improve tool life or part quality
If your team regularly solves problems that don’t have standard answers, qualifying activity almost certainly exists in your business.
What Expenses Are Included?
Once qualifying activities are identified, the credit is based on three categories of Qualified Research Expenses (QREs):
- Wages: Salaries and wages paid to employees directly engaged in or supervising qualifying research activities. This typically includes tool and die makers, design engineers, machinists involved in prototype development, and supervisors overseeing qualifying work.
- Supplies: Materials consumed during the research process, including raw stock, tooling materials, and components used in prototype builds or testing runs.
- Contract Research: 65% of amounts paid to outside contractors performing qualified research on your behalf.
For most tool and die shops, wages and supplies represent a substantial portion of QREs, which means the credit can be significant, especially for companies with experienced, well-compensated technical staff.
How the Credit Is Calculated
There are two primary methods for calculating the R&D Tax Credit:
Regular Credit Method: Equals 20% of qualified research expenses above a historically calculated base amount. This method can produce higher credits but requires complete historical data to calculate the base.
Alternative Simplified Credit (ASC): Equals 14% of QREs above 50% of the average QREs from the prior three tax years. This is often the most practical method for manufacturers without complete historical documentation.
In practice, most companies see a credit equivalent to roughly 6–8% of total qualified wages and supply expenses. For a shop with $3 million in qualifying payroll and materials, that’s a potential credit of $180,000–$240,000 annually, before accounting for any applicable state R&D credits that may stack on top.
Amended Returns: Recover What You’ve Already Earned
If your company has been performing qualifying work for years without claiming the credit, which is common in the tool and die industry, you’re not necessarily out of luck. The IRS generally allows amended returns for the three prior open tax years, which means credits you were entitled to but never claimed may still be recoverable.
For shops that have been operating for decades, this lookback opportunity can represent a meaningful one-time recovery. It’s worth finding out what’s on the table before that window closes.
Documentation: The Key to a Defensible Claim
With increased IRS scrutiny of R&D credit claims in recent years, documentation isn’t optional, it’s what separates a defensible credit from one that gets reversed under audit. A well-supported claim includes:
- Clear descriptions of each qualifying business component and the technical uncertainty that existed at the outset
- Records identifying the employees who performed qualifying work and what technical questions they were trying to answer
- Time allocation data or a supportable methodology for attributing employee time to qualifying activities
- Shop records, design files, revision histories, test results, and other contemporaneous documentation of the development process
The good news is that most tool and die shops already generate much of this documentation as a natural part of their operations : job travelers, engineering change orders, CAD revision logs, first-article inspection reports. With the right approach, these existing records can form the foundation of a strong, defensible claim.
Why Partner with CSSI?
CSSI has spent more than 23 years helping manufacturers, including tool and die shops and custom machinery builders, identify, calculate, and document R&D Tax Credits that stand up to scrutiny.
Our methodology is engineering-based, not assumption-based. We understand the technical nature of tool and die work because we approach every study the way an engineer would, examining the actual work being performed, identifying what genuinely qualifies, and building documentation that accurately reflects the innovation your team delivers every day.
With over 60,000 completed studies and a compliance-first approach, CSSI delivers credits that are both maximized and defensible. We’re not in the business of aggressive claims that create audit risk. We’re in the business of finding what’s legitimately yours and making sure you keep it.
Ready to See What Your Shop Qualifies For?
A free analysis is the fastest way to find out whether your tool, die, or machinery company qualifies and what a potential credit could mean for your bottom line. There’s no obligation; just a clear, honest look at an opportunity that may already exist in the work your team does every day.
