The short answer
The ATO operates a data-matching programme for cryptoassets, obtaining records from Australian digital currency exchanges and designated service providers, including account holder identification details and transaction data. That information is matched against lodged returns, and discrepancies generate contact.
Contact commonly begins with a letter — sometimes a prompt to review and amend, sometimes a request for information, sometimes notification of a review or audit. These are different things.
There is no universal response period for these letters. Different programmes and different templates specify different periods and different required actions. The period that applies to you is the one stated in the document you received. Do not adopt a figure quoted in general commentary, including this page, and do not assume it matches what someone else received.
What data the ATO holds
The data-matching protocols published for this programme describe the categories collected. Broadly, they cover identification information — names, addresses, dates of birth, contact details, identification numbers, and account identifiers — and transaction information including the type of asset, quantities, values, dates, and the accounts involved.
Data is collected for defined financial years under each protocol, and protocols are renewed and extended. The relevant point for a holder is that the coverage is retrospective as well as prospective: a letter can concern years already lodged.
Alongside domestic collection, the ATO receives information through international exchange arrangements, and that channel expands as the crypto-asset reporting framework is implemented across jurisdictions. Activity on a non-Australian exchange should not be assumed to be outside the ATO's view.
Reading your letter
Isolate four things before drafting anything:
- What kind of contact it is. A prompt to self-review, a formal information request, and a notice of audit have different consequences and different rights.
- Which financial years are in scope.
- What is actually being asked. Some letters ask you to review and amend if necessary; others ask for specific records.
- The stated response date and the stated channel.
The distinction in point one matters most. A prompt inviting self-review generally leaves the amendment route open, and amendments made before an audit commences are treated more favourably than adjustments made after.
How to respond
Establish the facts first. For each year in scope, rebuild the CGT position: every disposal, including crypto-to-crypto exchanges, with the cost base, the date, the capital proceeds, and any discount applied. Separately identify receipts treated as ordinary income.
Reconcile to what the ATO likely holds. If exchange data shows disposal proceeds substantially above what appears in your return, the explanation is usually transfers between your own wallets, or disposals you did not recognise as disposals. Both are answerable with records.
Provide the derivation, not the raw export. A schedule showing the computation is what resolves the matter. A CSV shifts the work and invites broader questions.
Amend where an error exists. Australia's amendment periods differ by taxpayer circumstances, and voluntary disclosure before audit generally attracts reduced penalties. If a correction is needed, making it promptly and voluntarily is materially better than defending an incorrect position.
Meet the stated date, or request an extension before it, and get the extension confirmed in writing.
The underlying error these letters usually find
In the great majority of cases, the discrepancy is not concealment. It is one of three things:
- crypto-to-crypto exchanges not treated as CGT events;
- transfers between the taxpayer's own wallets appearing as disposals in exchange data;
- staking, airdrop or reward receipts not returned as ordinary income at the time of receipt.
All three are documentation problems with documentation answers, provided the records exist.
Penalties and disclosure
Australian administrative penalties are behaviour-based, scaled by whether a shortfall arose from a failure to take reasonable care, recklessness, or intentional disregard, with reductions available for voluntary disclosure — and larger reductions where the disclosure is made before notification of an examination.
That last point is the operative one. Once the letter arrives, the most favourable disclosure window for the matters it covers has generally narrowed. A taxpayer who is aware of a problem and waiting to see whether it surfaces is trading a reduction they currently have for one they will not.
When to engage a professional
Where multiple years are in scope, where amounts are material, where income was omitted rather than misreported, where the activity may be on revenue rather than capital account, or where you are asked about intention. A registered tax agent or lawyer can be authorised to deal with the ATO on your behalf.
What changes this answer
- The specific letter, its programme and its stated date.
- Whether an audit has commenced, which changes the disclosure position.
- The years in scope and the applicable amendment periods.
- Whether the activity is on capital or revenue account.
- Residence status for each year, including part-year residence.
- Whether the taxpayer is an individual, company, trust or SMSF.
Related HolderTax pages
- Australian CGT events for crypto, including swaps and wrapping
- Australian loss rules and anti-avoidance purpose analysis
- Tax residency crossings mid-year
Evidence note
Derived from published ATO data-matching protocols and guidance on cryptoassets, amendments and penalties. Not professionally reviewed. This page deliberately states no universal response period, because none exists; the period is set by the document you received. Where a correction spans multiple years or the behaviour question is live, obtain Australian professional advice before responding.