R&D Tax Incentive deadlines: every date that matters

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:

Substituted accounting periods shift everything: the rule is always 10 months after your year end, whatever that is.

How to work out your own due date

1. Identify the last day of your income year (30 June for standard balancers, or your approved substituted accounting period date).
2. Add 10 calendar months. The result is your registration due date for the activities conducted in that year.

The rule is a period, not a fixed calendar date, so non-June balancers should never assume 30 April applies to them. A December balancer's deadline falls in October, six months out of step with the industry's usual chatter about "the April deadline".

If your due date lands on a weekend or public holiday, the deadline moves to the next business day. Do not plan around the extra day: lodge earlier.

Deadlines by income year end

Each income year is registered separately. Two years of R&D means two applications, each with its own 10-month clock, and an unregistered earlier year does not roll forward into the next one.

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.

Registration versus lodging your company tax return

These are two separate lodgements with two separate regulators, and their timing is only loosely coupled.

You do not have to register before you lodge the company tax return. You do have to hold a registration number before you can claim the offset. In practice companies take one of two routes:

1. Register first, lodge second. Cleanest option: the registration number goes straight into the R&D tax schedule.
2. Lodge first, amend later. Lodge the return without the offset to meet the ATO due date, then amend once AusIndustry issues the registration number.

Registering does not mean the activities have been approved. AusIndustry registers what you self-assess, and eligibility can be reviewed afterwards. The ATO separately reviews expenditure, as covered in our guide to R&D reviews and audits. Both regulators' guidance is summarised on the ATO's R&D tax incentive pages.

Amending a registration after you lodge it

You can apply to vary a registration in the portal, following the variation guidance on business.gov.au: adding an activity you overlooked, correcting a description, or removing an activity you no longer consider eligible.

Any change can be made before the statutory deadline. Requests to add an activity or significantly change one must be lodged before that deadline; after it closes, variations are limited to corrections of what was already lodged.

If a review has already begun, the window for tidying things up narrows sharply. Get the narratives right the first time.

What has to happen before year end?

Two things cannot be fixed after 30 June:

1. 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.
2. 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.

How long registration takes and when to start

Budget at least a fortnight of drafting time. The current registration form (portal version released 15 August 2025) is a field-by-field questionnaire rather than a single narrative, and each core activity carries its own fields with their own character minimums.

Character minimums per core activity field

How much lead time to allow

A typical application has three to seven core activities. That is potentially thousands of words of technical drafting, each field satisfying its own statutory element, plus the sources-investigated field (Q79) recording a worldwide prior-art search conducted before the work began.

Two weeks is realistic. Two days is not.

Rand builds those fields from the engineering and clinical evidence your team already generates in GitHub and Jira, so the drafting starts from what actually happened rather than from a blank text box in April.

A practical timeline for a 30 June year end

1. July to August: confirm which projects had genuine uncertainty and split them into discrete core activities. See core versus supporting activities.
2. September: collect contemporaneous evidence for each activity, including failed experiments. Our guide on documenting R&D for AusIndustry covers what counts.
3. October to November: draft the core activity fields to their minimums; finalise apportioned R&D salary and contractor figures.
4. January to February: internal technical review, then expert review of the registration narratives.
5. March: lodge in the portal.
6. April: buffer. Do not plan to use it.

What if the deadline is close and nothing is prepared?

Triage in this order:

1. 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.
2. 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.
3. 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.

Can you get an extension?

Yes, within defined limits. A short request made in time is approved on a brief explanation, a longer one is a discretionary decision on the reasons you give, and the law puts a ceiling on how far the date can move at all.

Up to 14 days, requested before the deadline

A request for 14 days or less, lodged through the customer portal before the deadline, is approved under the Industry Research and Development Decision-making Principles 2022 when it explains why the extension is needed and why 14 days is enough. You do not need to make a detailed case with supporting evidence.

The catch is timing. Once the date passes, this pathway is gone. You can still request a discretionary extension after the deadline has passed, but you must supply reasons and evidence, and the total extension cannot exceed 92 days after the statutory deadline.

Discretionary extensions and the 92-day cap

• Longer than 14 days: discretionary. You need reasons and supporting evidence, and AusIndustry decides.
• 92-day ceiling. Part 3 of the same Principles caps extensions at 92 days after the statutory deadline, so a registration more than roughly three months late is generally unrecoverable. The only exception is where AusIndustry grants further time so you can await the outcome of a related pending decision.

What strengthens an extension request

The single biggest factor is timing: a pre-emptive request is treated very differently from a late application with an explanation attached. Beyond that, one thing helps and one thing hurts.

• Specific circumstances: a serious illness, a natural disaster, a corporate event that made lodgement impossible.
• Weak grounds: "Our accountant was busy", "the financials were not finalised" and "we only just heard about the program" rarely persuade.

Treat the extension pathway as a fire escape, not a plan.

What happens if you miss the deadline?

You lose the offset for that income year. Registration must precede the claim, so with no registration number there is nothing for your tax agent to put in the R&D tax schedule.

The cost is easy to quantify. Take a company with aggregated turnover under $20M, a 25% base-rate company tax rate, and $600,000 of notional R&D deductions for the year:

• Refundable offset rate: 25% + 18.5 percentage points = 43.5%
• Offset: $600,000 x 43.5% = $261,000
• Registered late with no extension granted: $0 from the R&DTI, though the underlying expenditure is generally still deductible under the ordinary rules, depending on its character

That is the whole exposure in one number, and it is why the date belongs in a board calendar rather than a tax adviser's inbox.

Common reasons companies miss the date

• Assuming the tax agent handles registration. AusIndustry registration and the ATO schedule are different lodgements, and each side can assume the other has it.
• A substituted accounting period, where the team anchors to 30 April out of habit.
• Waiting for finalised financial statements that registration does not require; the activity narratives are the substance.
• Discovering in March that nobody recorded the hypothesis or the prior-art search before the work started, so the narratives cannot be honestly written in time.
• A first claim where the company only learns the program exists after the window has closed.

The deadline itself is the easy part. The work that makes a registration defensible (the hypotheses and the evidence behind them) has to exist well before it. If you want that assembled continuously through the year rather than reconstructed in April, that is the problem Rand is built to solve. For the full claim process end to end, see our complete guide to the R&D Tax Incentive.

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.