The R&D Tax Incentive has exactly one deadline that kills claims outright: registration. Everything else in the calendar exists to serve it. This post lays out every date, in order, for a company with a standard 30 June year end, and what to do when one is at risk.
What are the key dates?
For an income year ending 30 June 2026, the calendar looks like this:
| Date | What is due | Who to |
|---|---|---|
| Before 30 June 2026 | Advance Finding and Overseas Finding applications for FY2025-26 | AusIndustry |
| From 1 July 2026 | Registration window for FY2025-26 opens | AusIndustry |
| 31 December 2026 | End of the fast-processing window (about 20 business days) | AusIndustry |
| 30 April 2027 | Registration deadline for FY2025-26 (hard) | AusIndustry |
| Company tax return due date | Lodge return with R&D schedule (needs the registration number) | ATO |
| 5 years after the claim | Record retention obligation ends | Both |
Substituted accounting periods shift everything: the rule is always 10 months after your year end, whatever that is.
Why is registration the deadline that matters?
Because it is the gate to everything else. Under Division 355 you cannot claim the offset in your tax return without a registration number for that income year, and AusIndustry's discretion to accept late registrations is narrow. The official deadline guidance lists limited grounds for extension, and workload or unawareness are not among them.
The work itself can be perfectly eligible, the evidence immaculate, the expenditure substantiated, and none of it matters if 30 April passes unregistered.
Register early, lodge whenever
Registration and tax lodgement are decoupled. Registering in July or August, right after year end, costs nothing, gets the fast 20-day processing window, and means your tax return is never waiting on AusIndustry. The companies that register in April are the ones doing a year of evidence reconstruction in a fortnight.
What has to happen before year end?
Two things cannot be fixed after 30 June:
- Findings. An Overseas Finding is mandatory before overseas activity can be claimed, and the application must be in before the end of the income year the activity starts. An Advance Finding (optional, binding eligibility certainty) has the same before-year-end deadline.
- Evidence. Contemporaneous records by definition cannot be created later. If the year ends and the experimental story lives only in memory, the claim is already weakened, whatever the paperwork says. See contemporaneous evidence.
What if the deadline is close and nothing is prepared?
Triage in this order:
- Lodge the registration on time, even if imperfect. A registration built from the real activities you can substantiate beats a missed deadline. You cannot claim what you did not register, and you should not register what you cannot evidence.
- Scope to what you can defend. Under time pressure the temptation is to sweep everything in. Resist it: a narrower claim of well-evidenced activities is worth more than a broad one that invites a review you cannot survive. The review triggers guide explains what draws attention.
- Fix the system for next year. The deadline scramble is a symptom of evidence being reconstructed instead of captured. Continuous capture makes the next 30 April a non-event.
The full-lifecycle view
Registration is one step in the end-to-end claim process: records through the year, findings before year end, registration within 10 months, the R&D schedule with your tax return, and five years of retention after that. Companies that treat it as an annual filing event experience deadlines as emergencies; companies that treat it as a continuous process barely notice them.
The R&D Tax Incentive is a self-assessment program and this article is general information, not tax advice. Deadlines described are for standard cases; confirm dates for your own circumstances with your tax agent, especially under substituted accounting periods.