R&D Tax Incentive key dates for the 2025-26 income year

Prerequisites

Before you map out the key dates for the 2025-26 income year, make sure your business can answer four threshold questions:

• Are you an Australian company liable to income tax and conducting eligible research and development activities during the income year?
• Do you understand the difference between core R&D activities and supporting R&D activities, and can you describe them in a way that meets the Australian Government's definitions?
• Will your R&D expenditure exceed the $20,000 minimum threshold for the income year, or have you engaged a Research Service Provider in advance?
• Do you have a registered tax agent or accountant who can review and lodge your claim once you have prepared the evidence?

If you are unsure about eligibility, the GrantsMAX eligibility assessment uses your own accounting data to flag what you may be eligible for and where a reviewer would look closely. It then passes that assessment to a registered accountant to review, refine, and lodge through a shared workflow.

Warning: This article explains general timing logic and references official sources. It is not tax, financial, or legal advice. The ATO and AusIndustry can change deadlines, legislation, and program rules. Always confirm the exact dates for the relevant income year with your registered tax agent or directly on ato.gov.au and business.gov.au.

Step 1: Understand the two separate timeframes (income year and registration year)

The R&D Tax Incentive operates on two overlapping clocks that every claimant must manage:

1. Your income year, the 12 months ending 30 June 2026, which is the period in which you actually conduct the R&D activities and incur the expenditure.
2. Your registration year, the window after the income year ends during which you must register with AusIndustry and then lodge your claim with the ATO.

For the 2025-26 income year, the activities run from 1 July 2025 to 30 June 2026. The registration deadline is set by the Industry Research and Development Act 1986 and falls 10 months after the end of the income year: that is 30 April 2027. This date is published by AusIndustry and the ATO, but you should verify it each year because legislation or administrative practice can shift the exact day.

At the same time, the ATO expects you to lodge your company tax return (which triggers the R&D claim) by the normal lodgement date for your entity, typically 28 February 2027 if you lodge yourself, or a later date if you use a registered tax agent. The interaction between these two timelines is where many businesses stumble. We break it down in Step 2.

For a plain‑English overview of what the incentive is and who may be eligible, our guide to the R&D Tax Incentive walks you through the core concepts first.

Step 2: Circle the absolute AusIndustry registration deadline

The single date that gets repeated every year, and the one the ATO highlights in its official newsroom alerts, is the registration deadline for the income year just ended. For the 2025-26 income year, that deadline is 30 April 2027.

Here is the critical rule: if you miss registration, you cannot claim the R&D Tax Incentive for that income year, regardless of how strong your evidence is or how clearly your activities meet the eligibility tests. The ATO and AusIndustry do not have discretion to waive a late registration unless exceptional circumstances apply, and those are narrow.

You must register with AusIndustry through the R&D Tax Incentive customer portal, which is part of the Department of Industry, Science and Resources online system. The registration requires you to describe the core and supporting R&D activities that were undertaken during the 2025-26 year. It does not require you to lodge the final claim at that time, you are simply locking in your right to claim later.

Pro tip: Registration opens on 1 July 2026, the day after the income year ends. Do not wait until April 2027. Early registration has two advantages: it removes the risk of missing the deadline because of forgotten passwords, portal outages, or busy advisors, and it gives you a clearer picture of what AusIndustry may want to see in your evidence package. Many professional service firms echo this advice, Grant Thornton’s client alert on the 30 June 2025 registration deadline reinforces that last‑minute registrations create compliance pressure.

If you are a first‑time claimant, the mechanics may feel unfamiliar. GrantsMAX for first‑time claimants shows you a way to use your existing accounting data to draft the activity descriptions and register with a clear, evidence‑backed narrative.

Step 3: Map the lodgement window and how it interacts with your tax return

Registration is only one piece. To actually receive the R&D tax offset, you must lodge an income tax return that includes the R&D schedule and the detailed R&D expenditure calculation. The ATO’s standard lodgement date for the 2025-26 company tax return is 28 February 2027 if you lodge yourself. If you use a registered tax agent, the due date is generally later, but it still falls within the same financial year, often 31 March 2027 or a programmed date in May, depending on your prior lodgement history.

That means you have roughly 10 to 11 months after 30 June 2026 to prepare a complete, substantiated claim. The ATO’s Business Bulletins frequently remind businesses that the R&D schedule should be lodged at the same time as the company tax return. If you delay your tax return, you delay the claim.

Critical sequencing for the 2025-26 year:

• 1 July 2025 to 30 June 2026: Conduct and document R&D activities.
• By 30 June 2026: Close your books and capture all R&D expenditure in your accounting system (Xero, MYOB, QuickBooks, or other).
• 1 July 2026: Registration with AusIndustry opens. Begin drafting your registration.
• As soon as possible after 1 July 2026: Complete your AusIndustry registration (deadline 30 April 2027).
• Between July 2026 and early 2027: Prepare evidence, narratives, and expenditure calculations.
• When your 2026 company tax return is due: Lodge with the R&D schedule attached.

For businesses whose books live in cloud accounting, the data is already there. GrantsMAX for cloud‑accounting SMBs reads that data read‑only and drafts the pack, which your accountant then reviews and lodges.

Step 4: Build a substantiation timeline that matches the key dates

AusIndustry and the ATO expect you to maintain contemporaneous records that show the who, what, when, and how of each R&D activity. The Office of the Australian Information Commissioner’s guidance on record‑keeping, while focused on privacy, sets out principles for maintaining organised, accessible records that apply equally to tax substantiation. A good substantiation timeline for the 2025-26 year looks like this:

• July 2025 onward: Start keeping time‑tracking sheets, lab notebooks, sprint logs, design iterations, test results, and emails that show the technical challenges and how you addressed them. These records must be dated and linked to specific R&D activities.
• Quarterly during the income year: Reconcile your R&D expenditure against your accounting system. This is much easier if your accounting data is already connected, as the GrantsMAX opportunity discovery engine continuously scans your actual ledger for eligible activities.
• By 30 June 2026: Finalise all wages, contractor payments, consumables, and depreciation entries for the income year.
• July‑September 2026: Compile the activity narratives and build the expenditure schedule. Your evidence should cross‑reference the registration you will submit to AusIndustry.
• Before April 2027: Have your registered tax agent review the pack. The GrantsMAX accountant review workflow is built around exactly this handover, a prepared pack lands in a shared workspace where the accountant reviews, refines, and then formally lodges.

Pro tip: Do not wait until after you register with AusIndustry to start gathering evidence. AusIndustry may request documentation during a review, and if your records were created months or years after the activity, your claim may be reduced or rejected. Contemporaneous means real‑time, not reconstructed.

For manufacturers doing process improvement or new product development on the floor, the evidence trail is often hiding in your production data. GrantsMAX for manufacturers shows how to surface that data and turn it into a substantiated, defensible claim.

Step 5: Adjust your timeline for the 2026 reform (proposed changes)

In the 2026-27 Federal Budget, the government announced a proposed change to the R&D Tax Incentive that would lift the refundable-offset turnover threshold from $20 million to $50 million. This reform, according to analysis by Baker McKenzie, would allow more growing companies to receive cash refunds instead of non‑refundable tax offsets. As of today, the change is proposed only and has not passed into law.

If your business has an aggregated turnover between $20 million and $50 million, you need to watch this development closely. Should the law pass during the 2025-26 financial year, it could take effect for income years starting on or after 1 July 2025, meaning it could apply to the very income year we are discussing. If it passes later, it might only apply from 1 July 2026 onward.

Your key-dates timeline should include checkpoints in June 2026 and again in February 2027 to see whether the legislation has passed and what the final application date is. For now, plan as if the current law ($20 million threshold) remains, but build in the flexibility to adjust your claim if the rules change. GrantsMAX for growing companies keeps your claims current and prepares each one for your accountant to lodge, whatever the threshold turns out to be.

Step 6: Avoid the three most common timing mistakes

Even experienced claimants get caught by these traps. For the 2025-26 income year, watch for:

1. Missing the 30 April 2027 registration deadline. The OECD INNOTAX portal describes Australia’s R&D Tax Incentive as requiring timely registration, and multiple professional-service guides for 2025 emphasise how unforgiving this deadline is. Mark it in your calendar now.
2. Lodging the tax return before registering. The ATO requires registration to have occurred before the claim is lodged. If you lodge your 2026 tax return in September 2026 but wait until April 2027 to register, your claim will be invalid. Registration is the gate.
3. Assuming the company-tax-return date is the same as the registration date. Your tax agent’s lodgement program may give you until May 2027 or later to lodge the return, but the registration deadline remains 30 April 2027. If you miss registration, the later lodgement date does not help.

For businesses that want a single view of all their grant‑related deadlines, the GrantsMAX annual refresh feature updates each claim from the latest data and tracks milestones across the R&D Tax Incentive and other government grants like the EMDG export grant. Accounting firms can white‑label that same workflow and run it across their client base through the GrantsMAX accountant channel.

Step 7: Put it all together in a practical checklist for FY26

Here is a high‑level checklist you can adapt. Remember to verify each date with AusIndustry and the ATO directly.

• Confirm your company is eligible: incorporated under Australian law, liable to income tax, and conducting eligible R&D.
• Set up contemporaneous record‑keeping from 1 July 2025.
• Tag all R&D expenditure in your accounting software throughout the income year.
• Close FY26 books by 30 June 2026 and reconcile R&D costs.
• Register with AusIndustry between 1 July 2026 and 30 April 2027.
• Assemble the evidence pack: activity narratives, expenditure schedules, and linking workpapers.
• Engage a registered tax agent to review the pack.
• Lodge your 2026 company tax return with the R&D schedule attached by the agent’s due date.
• Retain all records for at least five years after the claim, in line with ATO substantiation rules.

Throughout this process, many businesses find that having an AI‑prepared pack significantly reduces the manual write‑up work. GrantsMAX for founders and CFOs connects to your accounting data, discovers what your business may be eligible for, and drafts the pack so your accountant can focus on review and lodgement, at a fraction of legacy consultant fees. Small teams that previously ignored grants because they lacked a finance function can now put funding within reach, GrantsMAX for small businesses was built precisely for that scenario.

Conclusion and next steps

The R&D Tax Incentive key dates for the 2025-26 income year boil down to three anchor points: conduct eligible activities between 1 July 2025 and 30 June 2026, register with AusIndustry by 30 April 2027, and lodge your company tax return with the R&D schedule by your tax agent’s due date (usually early 2027). The proposed 2026 reform may add a further wrinkle, and you should monitor its legislative progress.

Keep your evidence contemporaneous, treat registration as the non‑negotiable gate, and hand the completed pack to a registered tax agent who reviews and formally lodges it. GrantsMAX exists to make that preparation faster, more accurate, and grounded in your own accounting data, but it never lodges or guarantees an outcome, that remains the accountant’s and the business’s role.

If you want to be notified when GrantsMAX opens its next intake and see how it can prepare your FY26 R&D pack from your own data, join the waitlist today.