One day you hold a single coin; the next, the blockchain splits and you suddenly hold two. Hard forks like Bitcoin Cash and Bitcoin SV created exactly this situation for thousands of holders — and a lot of confusion about whether those free coins are taxable. The IRS has actually answered this one fairly clearly.
What Is a Hard Fork?
A hard fork is a permanent divergence in a blockchain's protocol that splits it into two separate chains running different rules. Holders of the original coin at the moment of the split may end up holding coins on both the old chain and the new one.
The classic example is the August 2017 split of Bitcoin into Bitcoin (BTC) and Bitcoin Cash (BCH). Anyone holding BTC at the fork block received an equal amount of the new BCH. The key tax question is what happens when those new coins land in a wallet you control.
The IRS Position: Ordinary Income
In Revenue Ruling 2019-24, the IRS addressed forks directly. The core distinction is whether the fork results in new coins actually being delivered to you:
- A hard fork without a receipt of new coins (you get nothing new) is not a taxable event.
- A hard fork followed by an airdrop of the new coins to your wallet results in ordinary income.
The Core Rule
When you receive new coins from a hard fork, you have ordinary income equal to their fair market value at the time you gain dominion and control — meaning the moment you can actually transfer, sell, or otherwise dispose of them. That same value becomes your cost basis in the new coins.
Dominion and Control: The Timing That Matters
"Dominion and control" is the pivotal concept. You don't have income simply because a fork occurred — you have income when you can actually use the coins. This timing depends on where you held the original asset:
- Self-custody wallet: you generally have control as soon as the forked coins are recorded to your address and the software supports them.
- Exchange: you have control only when the exchange credits the new coins to your account and enables them. If an exchange never supports the fork, you may never receive the coins — and never have income.
Worked Example
Suppose you held 3 BTC at a fork, and your exchange credited you 3 units of the new forked coin once it enabled trading. On that crediting date, the new coin traded at $250. You recognize $750 of ordinary income (3 × $250) for that tax year, and your cost basis in the 3 new coins is $750, or $250 each.
If you later sell all 3 for $400 each ($1,200 total), you have a $450 capital gain($1,200 proceeds minus $750 basis). Notice the original BTC is untouched by all this — your basis and holding period in the original coins stay exactly as they were.
You Owe Tax Even If You Never Sell
The income is triggered at receipt, not at sale. Even if you hold the forked coins indefinitely, you still owe ordinary income tax on their value when you gained control. Ignoring a fork because you "never touched" the coins is a common and costly mistake.
Forks vs. Airdrops vs. Chain Splits With No Receipt
It helps to separate three situations that often get blurred:
- Fork with coin receipt: ordinary income at fair market value when you gain control (the main case above).
- Fork with no receipt: if you never receive new coins, there is nothing to report.
- Standalone airdrop: tokens dropped to your wallet outside a fork are likewise ordinary income at their value when received and controllable.
Records to Keep for a Fork
Forks are easy to overlook at tax time precisely because the coins arrive passively. Protect yourself by documenting:
- The name of the new coin and the date you gained control of it
- The quantity received
- The fair market value in USD on that date (this is your income and your basis)
- Where the coins were held (which exchange or wallet) and when it enabled them
- Any later sale details for the capital gains calculation
Never Miss a Fork at Tax Time
BasisTracker captures forked and airdropped coins when they hit your wallet, records their value as income, and sets the right cost basis — so your eventual sale is calculated correctly.
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Conclusion
Hard forks aren't free money in the eyes of the IRS. If you receive new coins, you have ordinary income at their value when you gain control, and that value becomes your basis for a future sale. If you receive nothing, there's nothing to report.
The trap is forgetting about coins that appeared without any action on your part. Track the date, quantity, and value the moment a fork credits your wallet, and the rest of the tax math takes care of itself.
This article is for informational purposes only. Tax laws can change; consult a qualified tax professional for personalized advice.