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The ATO requires you to keep records for 5 years from the date you lodge your tax return. This isn't bureaucratic busy work. Without records, you cannot prove your cost bases or income amounts. When the ATO audits and finds gaps, it doesn't give you the benefit of the doubt. Instead, it estimates your tax liability. These estimates are rarely generous.
Why records matter
The ATO already has significant visibility into Australian crypto activity. Around 1.2 million Australian investors have their records cross-matched with ATO systems each year through the agency's data matching program. If your exchange records don't align with what the ATO has collected, a mismatch will flag your account. Public blockchain records add another layer of transparency. Once a transaction is on the blockchain, it stays there permanently.
What you need to keep
Record every transaction. This includes the date, the AUD value of the crypto at the time of transaction, what you sent and received, the purpose (purchase, sale, staking reward, gift, airdrop), and transaction IDs for on-chain activity. The AUD valuation matters. You need historical pricing data from the exact moment of transaction, not just the amounts you traded.
This applies across the board. Every buy and sell on every exchange requires records. Every on-chain transaction counts: swaps, DeFi deposits, NFT purchases. Staking rewards need documentation. Airdrops must be recorded. Even inter-wallet transfers, which aren't taxable, require records to prove ownership and trace your holdings.
What the ATO already knows
The ATO's data matching program collects account identification and transaction data from Australian digital currency exchanges. This happens continuously and will continue through FY2026. The program captures activity on Australian platforms regardless of whether you declare it. For on-chain activity on public blockchains, the ATO doesn't need your help. Blockchain records are permanently public.
The real change comes from CARF. The Crypto Asset Reporting Framework is an OECD standard designed for international tax authority coordination. Australia has committed to implementing it. The commencement date is January 1, 2027. Legislation is expected during 2026. From 2027 onwards, crypto exchanges in CARF-adopting countries will automatically report Australian customers' transaction data to the ATO. This closes a significant gap. Using international exchanges like Coinbase, Kraken, or Binance global will no longer provide opacity. The ATO will receive the data directly. Exchanges will report crypto-to-fiat trades, crypto-to-crypto trades, and transfers to and from wallets.
What this means for your records now
The window for undisclosed activity is shrinking. If you have past years with incomplete records, now is the time to reconstruct them. This is difficult but not impossible. Most exchanges maintain transaction history exports. On-chain activity is permanently recorded on the blockchain and can be retrieved. The challenging part is historical AUD pricing data. You need to apply the correct price at the exact moment of each transaction, not current prices.
Reconstructing records manually is tedious and error-prone. You'll need to pull exports from each exchange where you traded. Then you'll need to cross-reference on-chain wallets for any DeFi or peer-to-peer activity. Then you'll need to apply historical pricing to each line item. Mistakes in pricing or categorization compound across years.
How Summ handles record keeping
Summ automates this process. Import all your exchanges via API or CSV. Add on-chain wallets by pasting your public address, and Summ pulls the full transaction history directly from the blockchain. Historical AUD pricing is applied automatically to each transaction. Every transaction gets categorized: buy, sell, staking reward, airdrop, DeFi activity. Your complete audit-ready record is stored and accessible whenever you need it. Reports can be exported for your accountant or kept as your own records.
The time to get your records in order is now, before CARF legislation arrives and before the ATO's data matching escalates further.
Start with Summ today and ensure your records match what the ATO will see.
The information provided on this website is general in nature and is not tax, accounting or legal advice. It has been prepared without taking into account your objectives, financial situation or needs. Before acting on this information, you should consider the appropriateness of the information having regard to your own objectives, financial situation and needs and seek professional advice. Summ (formerly Crypto Tax Calculator) disclaims all and any guarantees, undertakings and warranties, expressed or implied, and is not liable for any loss or damage whatsoever (including human or computer error, negligent or otherwise, or incidental or Consequential Loss or damage) arising out of, or in connection with, any use or reliance on the information or advice in this website. The user must accept sole responsibility associated with the use of the material on this site, irrespective of the purpose for which such use or results are applied. The information in this website is no substitute for specialist advice.
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