Our developer invoices say consulting only. Is payment proof enough to support a contract research credit?
Payment evidence alone does not establish qualified contract research.
By AE Tax Advisors Team · Updated October 28, 2026
Payment evidence alone does not establish qualified contract research. The taxpayer must support the qualifying activities, contractual arrangement, rights, financial risk and applicable location requirements. A vague consulting invoice needs corroborating project evidence rather than a percentage chosen after the fact.
A specific business-owner situation
A developer bills a flat monthly fee covering experimental work, routine maintenance and commercial deployment. The company cannot treat all paid invoices as qualified research solely because the vendor writes code.
Illustrative example, not a client result.
What to establish before filing
- Review the research agreement.
- Separate experimental from routine deliverables.
- Substantiate eligible costs before applying the contract-research percentage.
Which fact changes the answer?
A contract entered before the research with required rights and risk differs from buying completed technology. Those facts can determine whether contract-research treatment is available.
A mistake to avoid
A vendor's R&D label does not replace the customer's eligibility analysis.
Records that support the decision
- Statement of work.
- Tickets test records and deliverables.
- Invoices and payment evidence.
The decision to document
Request project-level support and exclude amounts that cannot be reasonably substantiated.
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Related questions
- Our S corp generated a research credit. Is the owner's refund automatically equal to the credit amount?
- We bought another business. Can each company calculate its research credit independently?
Sources and editorial context
General educational information prepared with AI assistance. No individual professional review is claimed. Apply the relevant tax-year rules to the actual records. Editorial policy · AI disclosure.