The R&D Tax Credit · Brief · Intro level
Eight common R&D credit mistakes and how to fix them
The eight errors that sink research credit claims most often — from claiming every engineering wage to ignoring funded research and 280C timing — with the fix for each.
Most research credit claims that fail under exam fail for one of eight reasons, and most of them are preventable at filing. The pattern across IRS research credit exams is consistent: examiners attack the inputs — who counted, what counted, what was documented — far more often than the arithmetic.
The eight errors
1. All-engineering-wages. Claiming every dollar of every engineer's pay. Only qualified services count, and the 80% substantially-all wage rule of Treas. Reg. §1.41-2(d)(2) helps only those genuinely above the threshold. Fix: allocate time by person and project; let the honest variation show.
2. Funded research ignored. Customer-funded development claimed without reading the contracts. Section 41(d)(4)(H) excludes research where the taxpayer is paid regardless of success and keeps no substantial rights. Fix: review every development contract for payment contingency and rights terms before including its costs.
3. Section 280C timing. Assuming the reduced-credit election can be added later. It is original-return-only; missing it forces a deduction reduction instead. Fix: make the election decision part of the filing checklist, every year, with the math run both ways.
4. Missing business-component detail. Claims computed as one departmental pool with no project-level breakdown. The redesigned Form 6765 Section G now requires business-component reporting for larger claimants, and examiners expect it from everyone. Fix: build the claim bottom-up by component, not top-down from the general ledger.
5. No nexus documentation. QRE totals with nothing connecting specific costs to specific qualified activities. Courts have sustained full disallowance where the taxpayer could not tie wages to experimentation. Fix: keep the person-project-activity worksheet; it is the exhibit that wins or loses exams, as covered in R&D credit audit defense.
6. State conformity assumptions. Assuming the state credit or the state treatment of Section 174/174A matches federal. Many states have their own credit computations, different base periods, and their own conformity dates. Fix: run each state separately; never copy the federal QRE number into a state form unexamined.
7. Missed carryforward tracking. Credits limited by Section 38 in the claim year and then simply forgotten. The carryforward runs 20 years under Section 39, but only if someone maintains the schedule across preparer changes and software migrations. Fix: a standing carryforward schedule, by vintage year, reviewed annually.
8. Contingent-fee mill reliance. Signing a provider whose fee is a percentage of the credit "found," who delivers a number without workpapers, and who disappears at exam. Contingent fees around refund claims also raise Circular 230 problems for the practitioner. Fix: vet providers on methodology, deliverables, and exam support — the criteria in choosing a specialty tax provider.
Which errors cost the most under exam
Relative frequency of adjustment grounds in contested research credit claims (illustrative):
| Error | Typical exam outcome |
|---|---|
| All-engineering-wages | Partial disallowance, sometimes penalties |
| Funded research | Full disallowance of affected projects |
| No nexus documentation | Full disallowance risk — the burden is the taxpayer's |
| Missing component detail | Claim delayed or rejected as insufficient |
None of these errors means the credit is not worth claiming. It means the credit is worth claiming carefully: correct population, contracts read, elections calendared, and a file that anticipates the examiner rather than reacting to one.
Frequently asked questions
- What is the most common R&D credit mistake?
- Claiming 100% of every engineer's wages. Section 41 credits only qualified services — direct research, direct supervision, and direct support — and most engineering departments include meaningful time on maintenance, bug fixes to released products, administration, and routine work. Claims built on all-engineering-wages assumptions are the first thing examiners test, and the easiest adjustment to sustain.
- Does research paid for by a customer qualify for the R&D credit?
- Often not. Section 41(d)(4)(H) excludes funded research: if a customer pays for the work regardless of success and retains substantial rights to the results, the performing company cannot claim it. The analysis turns on contract terms — payment contingency and rights retention — so every customer-funded development contract must be reviewed before its costs go into the credit.
- Can I fix a missed Section 280C election on an amended return?
- No. The Section 280C(c)(2) reduced-credit election must be made on a timely filed original return, including extensions. Miss it and the full credit applies, but the corresponding R&E deduction must be reduced — which can raise taxable income unexpectedly. The fix is prospective: calendar the election with the original return every year the credit is claimed.