Short answer. Amended research claims for 2022-2024 need evidence created in 2022-2024, and most companies kept little beyond payroll. A commit history is the exception: timestamped, attributed to named engineers, and specific about what was attempted and what failed. The binder turns that history into per-year Section 41 documentation a CPA can attach to an amended filing.
Key facts
| The standard | Contemporaneous substantiation under Treas. Reg. 1.41-4 |
|---|---|
| Refund-claim bar | Business components and activities identified up front (since Jan 10, 2022) |
| What the repo already holds | Timestamped commits, PRs, and review threads from the claim years |
| What the binder adds | Per-year components, four-part-test rationale, QRE workpaper |
Reconstruction fails; timestamps do not
Memory written down years later is testimony. A commit log is a record.
When a 2022 claim is examined years later, the examiner's first question is what evidence existed at the time of the work. Interview notes and after-the-fact narratives can be challenged as reconstruction. Treas. Reg. 1.41-4 frames the substantiation expectation, and the IRS refund-claim rule in force since January 10, 2022 requires refund claims to name the business components and the research activities up front.
A repository answers in kind: every commit is stamped with a date and an author, tied to a branch and a pull request, and worded in the language of the problem being solved. Failed approaches stay in the history - reverts, abandoned branches, issue threads about what did not work - which is precisely the experimentation trail the four-part test asks about.
What the binder extracts from each claim year
One engagement per year, same method as a current-year binder.
R&D Binder ingests the commit range for the claim year, clusters the work into named business components, scores each against the Section 41 four-part test, and drafts the narrative with commit and PR citations. The payroll register for that year supplies the wage side, and the output is a per-year QRE workpaper plus the documentation binder.
Because the evidence is drawn from the period itself, the binder for an amended 2023 claim looks the same as a binder for a current-year claim: components, rationale, evidence trail, workpaper. Retroactive engagements price at the same tier as a current-year binder.
What commit history cannot do alone
Honesty about the limits keeps the claim defensible.
Commits do not show wages. The QRE dollars come from your payroll register, and contractor costs from invoices, which is why the binder pairs the repo evidence with those records. Commit history documents software research; if your claim includes lab work or hardware prototyping outside version control, that evidence has to come from elsewhere.
R&D Binder is documentation only. We do not compute your final credit, prepare Form 6765, file the amended return, or appear before the IRS. Your CPA does the filing; the binder is what they attach and rely on.
Keep going
The rest of the amended-return cluster, and where the binder fits:
Sources
Every claim on this page traces to a primary authority. Each source below is independent and verifiable.
- Rev. Proc. 2025-28 (procedural guidance for OBBBA Section 174A elections and amended returns) - Internal Revenue Service
- Treas. Reg. § 1.41-4 (recordkeeping and substantiation of qualified research) - Cornell Law School, Legal Information Institute
- 26 U.S.C. § 41 (credit for increasing research activities) - Cornell Law School, Legal Information Institute
- IRS, Instructions for Form 6765 - Internal Revenue Service
Get documentation built to survive an exam
If the work happened in version control between 2022 and 2024, the evidence already exists. R&D Binder turns it into the binder your CPA files behind.