The answer
Yes, technically, but mixing uses can complicate recordkeeping and identifying taxable disposals, transaction fees and cost bases.
What to do next
Consider separate labelled accounts or wallets and export transaction history regularly. Keep the public address and fiat value records needed for tax reporting.
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Frequently asked questions
Does simply having separate wallets change Australian tax law?
No. Tax treatment follows the transactions and circumstances, not the number of wallets.