What the rules actually require
Two provisions do the work. IRC §6001 requires every taxpayer to keep records sufficient to establish the items shown on the return. Treas. Reg. §1.41-4(d) adds the credit-specific version: a taxpayer claiming the research credit must retain records in sufficiently usable form and detail to substantiate that the expenditures claimed are eligible.
Notice what is not there. No form of log is prescribed. No template is blessed. The 2001 proposed regulations would have imposed a specific contemporaneous-documentation requirement, and that requirement was not carried into the final 2003 regulations - which is why any vendor telling you the regulations mandate a particular documentation product is selling, not citing.
The practical standard is stricter than the written one anyway. Records made while the work was happening are believed. Reconstructions made two years later have to be corroborated by something dated, and the corroboration is where thin studies come apart. So the operating rule is simple: capture the evidence the business already generates, at the time it is generated, and organize it before you need it.
The business component is the unit of proof
Not the department, not the fiscal year, not “R&D” as a line item. Every substantive question the IRS asks is asked one component at a time.
A business component is defined at §41(d)(2)(B) as any product, process, computer software, technique, formula, or invention held for sale, lease, or license, or used in your trade or business. The four-part test is applied to each one. Where a component as a whole does not qualify, the shrink-back rule at Treas. Reg. §1.41-4(b)(2) applies the test to the most significant subset of its elements - a subsystem, a module, a process step - which is often how a genuinely innovative piece of a mostly routine release survives review.
That structure is not a formality. It is the reason a study organized around projects, cost centers, or customers has to be rebuilt before it can be defended, and the reason QRE allocation should be performed component-first rather than pushed down from a department total.
Identity and dates
What the component is - product, process, software, technique, formula, or invention - who owned it, and the period during which development work ran. Dates matter: qualified research generally stops once the component is ready for commercial production.
The uncertainty at the outset
What you did not know when you started: whether the result was achievable at all, how to achieve it, or which design was appropriate. This is the fact an examiner probes first, and it has to be evidenced from the beginning of the work, not asserted at year end.
The alternatives evaluated
A process of experimentation means you considered and tested more than one path. Design reviews, trade studies, architecture decision records, formulation trials, and A/B or bench-test matrices are the natural artifacts.
The experimentation itself
Test plans and results, simulation and modeling output, prototypes and first articles, build travelers, batch records, lab notebooks, commit and ticket history - evidence that alternatives were actually evaluated rather than merely listed.
The people, by name
Who worked on this component, in what role - performing the research, directly supervising it, or directly supporting it - and how much of their year that accounted for.
The money, by category
The wages, supplies, computer or cloud rental, and contract-research amounts allocated to this component, traceable back to payroll registers, the general ledger, and the underlying invoices and statements of work.
Wages have to point at activities
Wages are usually the largest QRE category and the first one adjusted. The question is never “does this person do R&D” - it is “which component, doing what, and how do you know.”
§41(b)(2)(B) counts three kinds of qualified services: performing qualified research, directly supervising it, and directly supporting it. The three are not interchangeable. Direct supervision means first-line technical management of the researchers, not a department head two levels up. Direct support means work performed for the research itself - a technician machining a test fixture, a lab assistant running assays - not the HR, finance, or legal functions that support the company generally.
There is one simplification worth knowing. Under Treas. Reg. §1.41-2(d)(2), if substantially all of an individual’s services for the year are qualified services - 80% or more - then all of that individual’s wages for the year are treated as qualified. Below that line, wages are allocated on a reasonable basis under §1.41-2(d)(1), and the word carrying the weight is reasonable: a basis you can describe, apply consistently, and support.
Most companies already hold the raw material. Ticket systems, source control, PLM and change orders, MES travelers, and electronic lab notebooks all record who touched what and when. Mapping those systems to the business-component list is nearly always faster - and more defensible - than standing up a new timesheet regime the engineers will resent and backfill.
| Approach | How it works | Evidentiary weight | What to watch |
|---|---|---|---|
| Contemporaneous project time | Engineers book hours to projects or tickets as the work happens, and the project taxonomy maps to business components. | Strongest | The allocation is evidence, not an estimate. Requires that the project taxonomy and the business-component list line up - the most common place this breaks. |
| System-derived allocation | Ticket, commit, PLM, MES, or ELN activity is attributed to components and used to allocate each person’s year. | Strong | Uses records the company already keeps for other reasons, which is why it holds up. Needs a written, consistently applied methodology and a sanity check against how people actually spent their time. |
| Structured interviews plus corroboration | Technical leads state allocations in recorded interviews, each one tied to dated artifacts for the same period. | Workable | Standard practice where no time system exists. The corroboration is what carries it; the interview alone is a statement, not a record. |
| Unsupported estimates | A flat percentage applied across a department with nothing dated behind it. | Weak | This is what gets adjusted. Courts have accepted reasonable allocation methods that rest on real records, and rejected percentages with no documentary anchor at all. |
Narratives that answer the test, not the marketing
A technical narrative is not a project summary. It is an argument, one per business component, that walks the four-part test in order and points at evidence for each part: the permitted purpose the work served, why it relied on principles of engineering, computer science, or the physical or biological sciences, the specific technical uncertainty faced at the outset, and the systematic evaluation of alternatives used to resolve it.
Two things separate a narrative that holds from one that reads well. First, specificity: “improved throughput” is a claim, while “could not hold ±0.02 mm on the hardened sleeve at the required cycle time, evaluated four fixturing approaches over eleven trials” is a fact pattern. Second, traceability: every assertion should be answerable with a dated artifact you can hand over, and the narrative should say which one.
The same document also has to carry the negative screening. §41(d)(4) excludes research after commercial production, adaptation and duplication, surveys and studies, routine data collection and quality control, social sciences, research conducted outside the United States, funded research, and - via a higher threshold - most internal-use software. A narrative that never mentions why the exclusions do not apply leaves the examiner to decide that for you.
The December 2024 form made component detail a filing item
Substantiation used to live entirely in your files. On the revised Form 6765, part of it is reported on the return itself.
The IRS finalized a substantially revised Form 6765 in December 2024. Alongside the familiar credit computations, it added Section E (other information), Section F (a consolidated QRE summary), and Section G - business component information, reported component by component.
Section G is the one that changes behavior. For each reported component you supply its name or identifier, its type, whether software is internal-use, a description of the information sought to be discovered (currently required only on amended returns), and the QREs assigned to that component broken out by category - direct research wages, direct supervision, direct support, supplies, computer rental, and contract research. Components are reported in descending order by QRE until you have covered 80% of total QREs, capped at 50 components.
Section A
Regular Credit
The 20% computation over the fixed-base amount, for filers using the Regular Credit method.
Section B
Alternative Simplified Credit
The ASC computation - 14% over 50% of the prior three-year average, or 6% of current-year QREs where there is no qualifying base.
Section C
Current-year credit
Where the elected method lands, and how the credit carries into the general business credit.
Section D
QSB payroll tax election
The qualified small business election under §41(h) - the gateway to Form 8974 and the payroll-tax offset.
Section E
Other information
A short set of questions including the number of business components generating QREs, officers’ wages in the claim, whether a major portion of a trade or business was acquired or disposed of, and whether QREs were determined under the ASC 730 directive.
Section F
QRE summary
Wages, supplies, computer rental, and contract research totaled in one place, feeding the computation in Section A or B.
Section G
Business component detail
The component-by-component report: name, type, whether software is internal-use, the information sought to be discovered (amended returns only, currently), and the QREs assigned to that component split by category.
Who has to complete Section G, and when. Under the current instructions, Section G is optional for tax years beginning before 2026 and applicable for tax years beginning after 2025. As the instructions stand, two groups are excepted: qualified small businesses under §41(h)(3) that check the box to claim the reduced payroll tax credit, and taxpayers with total QREs of $1.5 million or less - determined at the controlled-group level - and gross receipts of $50 million or less, claiming the credit on an originally filed return. Thresholds and phase-in dates have already been revised more than once; confirm against the current-year form instructions before you rely on an exception.
The practical consequence is the same either way. A study that already resolves to the business component populates Section G directly. A study built on department totals has to be taken apart first - and the component detail it produces under pressure is exactly the detail an examiner will test.
What the IRS asks for
An examination of the research credit opens with document requests. The specific wording varies; the shape rarely does.
Quantitative requests
- Payroll registers and wage detail for every employee in the claim, with titles
- The time records or written allocation methodology behind each qualified percentage
- General-ledger detail for supply accounts, plus invoices for a sample of items
- Contracts, statements of work, and purchase orders for claimed contract research
- Invoices supporting computer and cloud rental included as QREs
- Prior-year gross receipts and QREs supporting the base-period computation
- Organization charts and job descriptions for the claimed population
- The credit computation, reconciled line-for-line to the filed Form 6765
Technical requests
- The business-component list with QREs assigned to each
- The technical narrative for each sampled component
- Dated evidence of the uncertainty that existed at the outset
- Evidence of the alternatives evaluated and how they were tested
- Test plans, results, travelers, batch records, notebooks, tickets, commits
- Records tying named individuals to named components
- Grant agreements and customer contracts for the funded-research screen
- Evidence of when each component reached commercial production
Amended returns carry an extra burden
A research credit claimed on an amended return is a refund claim, and the IRS requires specified information for the claim to be valid - identifying the business components the claim relates to, the research activities performed for each, and the total qualified wage, supply, and contract-research expenses for the year. Two earlier items, naming the individuals who performed each activity and the information each sought to discover, were waived for refund claims filed on or after June 18, 2024. This guidance has been revised repeatedly, including the window allowed to perfect a deficient claim; check current IRS guidance before filing. A study built to component level satisfies the substance of the requirement as a by-product.
One safe harbor, for a narrow population
Certain larger taxpayers that follow U.S. GAAP and report R&D as a separate line item in certified audited financial statements may use the IRS’s ASC 730 directive to treat an adjusted book R&D figure as QREs for examination purposes - which is why the revised Form 6765 asks whether you did. It is an administrative convenience for a specific profile, not a general alternative to substantiation, and most companies reading this page will not qualify for it.
Built as evidence, not assembled as a defense
The difference between a study that survives review and one that does not is usually decided months before anyone asks.
The Ricerca platform is organized around the business component from intake forward. Payroll, general-ledger, and project data are mapped to components; each component is evaluated against the four-part test and screened against every §41(d)(4) exclusion before a dollar is counted; wages are allocated with a stated, consistently applied methodology; and each narrative is written against the test with its supporting artifacts referenced. The software will not pass a component that is missing its substantiation, which is a deliberately inconvenient design decision.
Our R&D experts review qualification decisions, allocations, and narratives, and finalize every study before it is issued. What you receive is the study report, the QRE workpapers, per-component narratives, and filing-ready forms - Form 6765 including the Section G detail, Form 8974 where the payroll offset applies, and a pro-forma Form 3800 - in an organized audit file your preparer can file from and an examiner can read. See how a study runs end to end.
If the IRS examines the credit, Audit Protection is included with every study: Ricerca prepares the audit response, assembles the documentation the examiner requests, and defends the technical positions in the study, working alongside your tax preparer. Representation before the IRS, where it is needed, is performed by credentialed practitioners. Coverage is limited to the R&D study and the related federal credits, under the terms of your engagement agreement, and depends on the accuracy and completeness of the information you provide.
Read the primary sources
Everything above is summary. The statute, the regulations, and the current form instructions govern.
Keep exploring
Documentation is one spoke of the §41 picture.
The four-part test
What each narrative has to prove, part by part.
Qualified research expenses
Which dollars are eligible before you document them.
Calculation methods
Regular vs. ASC, the fixed-base percentage, and §280C.
Audit Protection
What happens if the IRS examines the credit.
Industry-specific evidence looks different in each field - see R&D credits by industry, or jump straight to the R&D credit FAQ.