Filing Your Bitcoin Tax Return in Australia: What Method Should You Use?
Filing your tax return as a bitcoin holder in Australia involves understanding how to calculate your capital gains or income correctly. One of the most important choices you will make is how to account for your purchases and disposals — this is where FIFO, LIFO, HIFO, and Specific Identification methods come into play.
This article walks you through these options and helps you determine which method best suits your situation.
Disclaimer: This guide provides general information only and does not constitute financial or tax advice. Tax laws and interpretations may change over time. Always consult with a qualified tax professional regarding your specific circumstances.
Investor or Trader? The ATO Makes a Key Distinction
Before diving into cost basis methods, you need to know whether you are considered a bitcoin investor or a bitcoin trader. The Australian Taxation Office (ATO) treats these roles very differently:
- Investors are subject to Capital Gains Tax (CGT).
- Traders operate under income tax rules, treating their bitcoin as trading stock in a business.
💡 You can be both an investor and a trader depending on how you use different parts of your bitcoin holdings.
The ATO’s official guidance on share investing versus share trading applies to bitcoin as well, and helps determine how your activity should be taxed.
Bitcoin Investors: Accepted Cost Basis Methods
If you are classified as a bitcoin investor, you are allowed to choose from several accounting methods when working out capital gains:
1. FIFO – First In, First Out
FIFO assumes the first bitcoin you acquired is the first you sold. It is the most commonly used method and widely accepted by the ATO.
Example:
- Buy 1 BTC @ $20,000 (Jan)
- Buy 1 BTC @ $30,000 (Mar)
- Sell 1 BTC @ $40,000 (June)
Under FIFO, your cost base is $20,000, so your capital gain is $20,000.
2. LIFO – Last In, First Out
LIFO assumes you dispose of your most recently acquired bitcoin first.
Same example:
- You sell the March BTC ($30,000 cost base), giving a capital gain of $10,000.
✅ LIFO is allowed for investors, provided you apply it consistently throughout the entire financial year.
3. HIFO – Highest In, First Out
HIFO lets you sell the bitcoin with the highest cost base first, which can reduce your capital gain and tax burden.
Same example:
- Sell the BTC purchased at $30,000 instead of $20,000, resulting in a $10,000 gain rather than $20,000.
✅ HIFO is also permitted for investors and is particularly helpful for tax minimisation.
4. Specific Identification (Specific ID)
This method allows you to choose exactly which sats to sell — as long as you have detailed records that show the purchase date, cost base, and wallet address or transaction ID.
Example:
You may choose to sell the BTC purchased at $28,000, giving you a gain of $12,000, even if it is not your oldest or most recent.
⚠️ To use Specific ID, you must be able to clearly identify each unit of bitcoin you hold and dispose of.
Can You Use Different Methods?
Yes, the ATO usually permits flexibility:
- You can use HIFO in one year, and FIFO in the next.
However, changing methods too frequently is not recommended. It increases the risk of calculation errors and may raise red flags in case of audit.
Sticking to one consistent method each year — or for each wallet holding — is considered best practice.
Bitcoin Traders: Different Rules Apply
If you are constantly buying and selling bitcoin for profit, you may be considered a trader by the ATO. In this case:
- Bitcoin is treated as trading stock.
- Gains are taxed as ordinary income, not capital gains.
- Losses and related costs are deductible in the year they are incurred.
For traders:
- You must use FIFO if you can’t specifically identify each unit.
- LIFO is not allowed under trading stock rules.
- Average cost is another accepted method.
Summary: Bitcoin Accounting Methods by Role
ATO Guidance
Want to understand your classification better and avoid any mistakes? The ATO’s official page on share investing vs share trading outlines the differences and tax implications, which also apply to bitcoin.
Key takeaways include:
- If you are buying and selling for long-term value or personal gain, you are likely an investor.
- If you are actively trading with high volume and intention to profit, you are probably carrying on a business and must apply trader rules.
Final Tips
- Choose one method and be consistent.
- Keep accurate, timestamped records — especially if using Specific ID.
- Use a tax professional or software that understands bitcoin-specific tax treatment.
- Always check your method against your investor or trader classification.
Important: Tax treatment can vary depending on individual circumstances. Before submitting your return, we strongly suggest you verify your approach with a Bitcoin savvy tax accountant.
You can view and participate in official discussions on the ATO’s community forum here: ATO Community: Bitcoin cost basis methods (FIFO, LIFO, HIFO)
Disclaimer: This guide provides general information only and does not constitute financial or tax advice. Tax laws and interpretations may change over time. Always consult with a qualified tax professional regarding your specific circumstances.
