The Australian Taxation Office (ATO’s) crypto data-matching program collects transaction records on up to 1.2 million individuals and entities every financial year, allowing it to cross-reference what exchanges report with what you declare. This matters when it comes to a chain split because the new coin you receive may not be taxed when it reaches your wallet, but the transaction and resulting asset still remain within the ATO’s records.
A chain split occurs when a blockchain forks into two competing versions, leaving holders of the original asset with a new one as well, such as Bitcoin Cash landing in Bitcoin holders’ wallets. The tax treatment then comes down to two key questions i.e, what happens when you receive the new asset and what happens later when you dispose of it.
Key Takeaways
- Receiving a new asset from a chain split isn’t taxed as income or a capital gain.
- The new asset’s cost base is zero, so tax only applies when you dispose of it.
- You need to work out which asset is the original and which one is genuinely new.
- If neither asset continues the original, you crystallise a capital loss at the split itself.
How Does The ATO Tax Crypto Chain Splits In Australia?
Unlike most crypto transactions, a chain split has two entirely separate tax moments: the split itself, and whatever you eventually do with the new asset. The ATO treats these very differently, and mixing them up is where most of the confusion around forks comes from.
Tax Treatment When You Receive The New Asset
As an investor, receiving a new crypto asset because of a chain split isn’t treated as ordinary income or a capital gain tax (CGT) at the time you receive it. There are no immediate tax consequences, even though a genuinely new asset has landed in your wallet with real market value.
Tax Treatment When You Dispose Of The New Asset
The cost base of the new asset is zero, which means the entire proceeds become a capital gain attracting CGT when you eventually sell, swap, or otherwise dispose of it. You may be entitled to the 12-month CGT discount, calculated from the date of the split, not from whenever you first noticed the new coin.
Note: If you acquire the new asset while carrying on a business rather than as a personal investor, it may be treated differently for tax purposes than the individual-investor rules covered in this guide.
How To Work Out Which Crypto Asset Is "New" After A Split?
Not every chain split leaves you with an obviously “new” asset. Working out which of your post-split holdings is the continuation of the original, and which one is genuinely new, depends on examining the actual rights and relationships each asset carries forward.
When One Asset Continues The Original
If one of the post-split assets keeps the same rights and relationships as your original holding, it’s treated as a continuation of that original asset, not a new one. The other asset you receive because of the split is the new asset, with a zero cost base starting from the date of the split.
When Neither Asset Continues The Original
If neither post-split asset carries forward the same rights and relationships, the original asset is treated as abandoned, and a CGT event C2 happens to it at the moment of the split. This can produce a capital loss equal to your original cost base, with both resulting assets then treated as new, each with a zero cost base and an acquisition date of the split.
How To Calculate Tax On Crypto Chain Splits In Australia?
Calculating tax on a chain split is simpler than most crypto transactions in one specific way: there’s nothing to work out at the point of receipt. The calculation only starts once you dispose of the new asset, or if the original is treated as abandoned.
Step 1: Set Your Cost Base To Zero
Whichever asset is treated as new, whether it’s the coin you received or both resulting assets in an abandonment scenario, its cost base is zero. Nothing you paid, since you didn’t pay anything, factors into this figure.
Cost Base = $0
Step 2: Work Out Your Capital Proceeds At Disposal
When you eventually sell, swap, or spend the new asset, your capital proceeds are its Australian dollar market value at the time of that disposal, converted using the exchange rate that applied on that date.
Capital Proceeds = A$ Market Value At Disposal
Step 3: Calculate Your Capital Gain
Because the cost base is zero, the entire capital proceeds amount becomes your capital gain. There’s no separate subtraction step here, unlike most other crypto disposals where you’re comparing proceeds against what you actually paid.
Capital Gain = Capital Proceeds − $0 = Capital Proceeds
Step 4: Apply The CGT Discount (If Eligible)
If you held the new asset for at least 12 months from the date of the split before disposing of it, you can reduce the capital gain by the CGT discount before adding it to your other gains for the year.
Discounted Gain = Capital Gain × 50% (individuals; discount applies only if held 12+ months from the split date)
Real-World Example
A user on the ATO’s community forum asked about a related but distinct scenario: some projects periodically double their total token supply, automatically doubling every holder’s balance. The old token becomes worthless, and the total value of the new tokens matches the total value of the old ones before the event. Their question was whether this counts as a CGT event, the way a share stock split typically doesn’t.
This is genuinely different from the chain splits covered throughout this guide. A chain split is two competing blockchain versions sharing pre-split history; this is one project replacing its token outright, with no second chain and nothing “abandoned” in the sense the ATO’s chain-split guidance describes. Applying the zero-cost-base chain-split treatment here would likely be wrong.
Assumptions
- Original holding: 100 tokens, cost base A$1,000 (A$10 each)
- Token split event: supply doubles, holder now has 200 tokens
- Market value of the 200 new tokens immediately after: A$1,000 total (A$5 each), unchanged from before
Step 1: Consider Whether A CGT Event Happens On The Old Tokens
If the old tokens are treated as ending in exchange for the new ones, this points toward a CGT event happening on the original 100 tokens, with capital proceeds equal to the market value of the 200 new tokens received.
Capital Gain = A$1,000 (Proceeds) − A$1,000 (Cost Base) = $0
No gain arises in this example, purely because total value didn’t change across the split.
Step 2: Establish The Cost Base Of The New Tokens
If that reasoning holds, the 200 new tokens inherit a combined cost base of A$1,000, or A$5 per token, spread across double the units rather than starting from zero.
Important Thing To Note:
This exact scenario doesn’t have dedicated ATO guidance the way ordinary chain splits do. The “$0 gain” outcome above only holds if the ATO treats it as a like-for-like value replacement. If it instead treats each new token as a fresh asset with a zero cost base, closer to the chain-split treatment, the result would be very different and considerably worse for the holder. This is a case worth confirming with a registered tax agent before relying on either interpretation.
How To Report Crypto Chain Splits In Australia?
Reporting a chain split is mostly about reporting nothing until disposal, then reporting it correctly when that day comes. The two moments involve completely different record-keeping needs.
Record The Split Details Even Though Nothing's Taxable Yet
Record the date of the split, the name and quantity of the new asset you received, and its market value in Australian dollars on that date, even though nothing is taxable yet. This becomes essential later, since it establishes when the zero-cost-base clock started running.
Work Out Continuation Before You File Anything
Determine whether either post-split asset continues the original’s rights and relationships, and keep a note of your reasoning. This decides whether you’re tracking one new asset with a zero cost base, or two, alongside a possible capital loss on the original.
Report The Disposal Through Capital Gains
When you dispose of the new asset, report the capital gain through the capital gains section of your return, using myTax or the Supplementary tax return depending on how you lodge, applying the CGT discount if you’ve held it for 12 months or more.
How Can KoinX Help With Crypto Chain Split Tax in Australia?
Tracking which post-split asset is genuinely new, when the zero-cost-base clock started, and whether the original asset needs to be treated as abandoned is exactly the kind of detail that gets lost without careful record-keeping, especially months or years after the split actually happened. KoinX keeps your holdings organised from the date of the split onward, so the zero cost base and acquisition date are recorded correctly from day one rather than reconstructed later from memory or scattered exchange statements.
Complete ATO Tax Report
The KoinX’s Complete Tax Report applies ATO rules directly to your transaction data, covering CGT discounts, income, derivatives and your portfolio balance in one document, including any zero-cost-base assets from a chain split. It’s built to reflect the categories the ATO expects to see, so a split asset doesn’t get lost or miscategorised.
Free Crypto Tax Calculator
Before committing to a paid report, KoinX’s free crypto tax calculator for Australia gives you a quick estimate of what you owe across your full crypto portfolio, chain split assets fully included in that figure. It’s a useful first step if you just want a ballpark number before reconciling every transaction in detail.
If you’re holding crypto from a chain split, whether from years ago or a more recent fork, connecting your wallets to KoinX keeps the zero cost base and acquisition date correct from day one, rather than something you have to piece together at tax time. Get started with KoinX and turn scattered split history, across every wallet and exchange, into an accurate, return-ready report.
Conclusion
A chain split isn’t taxed on the day it happens, but it isn’t tax-free either. The new asset carries a zero cost base forward, and whichever asset is genuinely “new” determines whether you’re tracking one holding or a crystallised loss on the original as well.
Getting that classification right from day one is exactly what KoinX handles for you, alongside the rest of your crypto activity. Connect your wallets to KoinX and keep every split-derived asset accurately tracked from acquisition through to eventual disposal.
Frequently Asked Questions
Do I Pay Tax When I First Receive A New Asset From A Chain Split?
No. Receiving a new crypto asset because of a chain split isn’t treated as ordinary income or a capital gain at the time you receive it, regardless of its market value on that date. Tax only applies later, when you dispose of the new asset, based on its zero cost base.
What Is The Cost Base Of Crypto I Receive From A Chain Split?
It’s zero. You didn’t pay anything to acquire it, so when you eventually dispose of it, the entire Australian dollar value you receive becomes your capital gain, without anything to subtract from it. This is different from most other crypto assets, which have a real acquisition cost.
How Do I Know Which Asset Is The Original After A Chain Split?
You examine whether either asset keeps the same rights and relationships as the original blockchain, both technically and in how the community treats it. Whichever asset continues those rights is the original; the other is new. If neither does, the original is treated as abandoned entirely.
Can A Chain Split Result In A Capital Loss?
Yes. If neither post-split asset carries forward the original’s rights and relationships, a CGT event happens to the original at the time of the split, producing a capital gain or loss equal to its cost base. Both resulting assets are then treated as new, each with a zero cost base.
Does The 12-Month CGT Discount Apply To Assets From A Chain Split?
The same 12-month rule applies, but the clock starts from the date of the split, not from when you first became aware of the new asset or started actively using it. Holding the new asset for 12 months or more from that split date makes the discount available.
