I have not yet gotten this checked by an accountant.
This is not legal/tax advice. But since I'm seeing all sorts of weird and almost-certainly-wrong theories, here is my interpretation of US tax law in relation to forks.
Imagine the following hypothetical:
- Canada somehow gets access to a database of exactly how many US dollars each person owns, updated live.
- At some exact instant in time, they take a snapshot of this database.
- Anyone who has a balance in Canada's USD snapshot is automatically and involuntarily given a bank account in Canada containing an equal number of Canadian dollars. You can walk into a Canadian bank and withdraw the CAD, or sell it, or whatever.
Forks are like that, but since Bitcoin is decentralized, anyone can create one of these forks with no cost whatsoever. I could personally create a million such forks, and everyone who owns bitcoin would receive a million different currencies. You cannot
avoid receiving the coins, it is done without your permission, and very often you will not even know that a fork had occurred. Furthermore, in many cases it would be unsafe to access the fork-coins due to the stupid ways in which forks are done. Due to all of these factors,
I consider it impossible to account for forks at time-of-creation, and forks therefore cannot be treated as dividends or other income at time of creation.
Given that, the closest similar handling seems to be a stock spin-off. In a spin-off, you have to adjust the basis of the original asset according to the spin-off's value at time of creation. However, it is not always clear that anything is being taken
from Bitcoin when these forks are created. Often, the Bitcoin price does not decrease upon the creation of one of these forks, but the fork sometimes still attains a somewhat-significant value. Some would argue that the money flowing into the fork-coin is being redirected from Bitcoin, and so the basis for the fork-coins should not be zero, but it is unclear. For example, here are the prices of Bitcoin and BCH near the creation of BCH on Aug 1, 2017:
Date BTC BCH
Jul 31 2796 N/A
Aug 1 2723 281
Aug 2 2759 366
Aug 3 2832 602
Aug 4 3140 377
Aug 5 3224 237
As you can see, although the BTC price dropped slightly on the day that BCH was created, BCH had a much higher value than the drop in BTC price would account for. You could theorize that the price of BTC
would've been higher if the fork had not happened, but this is subjective and impossible to quantify.
An additional complication is that in a stock spin-off, there will be an official initial spin-off price based on trading on regulated futures markets and price as of market-start. But there are dozens of Bitcoin and other-cryptocurrency exchanges, none of which are "official". Forkcoins have no regulated futures markets (or regulated
any markets in most cases). There is no single unambiguous starting price for the fork-coin. Trading is also 24/7 and continuous, not broken up into days. So you can't get a good initial price for forks.
Plus, if forkcoins are treated as spin-offs with non-zero value, then the following scheme seems possible:
- Some tiny fork-coin is created, and it attains an "initial market price" of $1 on absolutely minuscule volume. In other words, although the charts show it as having a price of $1, anyone who cared to do so could bring it down to nearly nothing with just a bit of money.
- Using spin-off basis calculations, all Bitcoin holders can now reduce the basis of their bitcoins slightly by treating the above tiny fork-coin as a spin-off, even if that fork-coin very soon disappears to basically nothing.
- Repeat hundreds of times, reducing everyone's Bitcoin basis significantly.
With all of the above in consideration, my conclusions are:
- Forkcoins are not adequately handled by current US tax law.
- The most justifiable thing to do right now, which avoids as many of the above issues as possible, is to
handle it as a capital gain at the time of sale with a basis of zero and an acquisition date of the fork time. I do not think that it is necessarily
fair for BTC holders to have to use a basis of zero here, but anything else seems too difficult to calculate/justify.
Again, this is only my interpretation based on my own research, and it is not tax advice. Consult an accountant.