Superficial Loss Rule For Crypto In Canada: The 30-Day Wash Sale Trap

Tax-loss selling is a real strategy in December. Sell the coin that is down, bank the capital loss against your gains, buy it back. In stocks, Canadians learn the 30-day trap quickly. In crypto, because buying back is a couple of taps on an app, people walk into it without knowing the rule exists. This page explains the rule from the CRA's own words and where crypto is less clear.

What Is The Superficial Loss Rule In Canada?

The CRA's capital gains guide, T4037, says a superficial loss can occur when you dispose of capital property for a loss and both of these are true: you, or a person affiliated with you, buys or has a right to buy the same or identical property (the "substituted property") during the period starting 30 calendar days before the sale and ending 30 calendar days after it, and you or that person still owns, or has a right to buy, the substituted property 30 calendar days after the sale (CRA guide T4037).

If you have a superficial loss, you cannot deduct it in that year. If you are the person who acquires the substituted property, you can usually add the amount of the loss to its adjusted cost base. That lowers your gain or raises your loss when you finally sell the replacement.

Does The Superficial Loss Rule Apply To Crypto?

The rule is written for capital property, and crypto you hold as an investment is capital property in the CRA's framework: it says you realize a capital gain or loss on a disposition made on account of capital (CRA, reporting income from crypto-asset transactions). The CRA's crypto pages do not mention the superficial loss rule by name. So this is my reading of how the general rule applies, not a quote from a crypto-specific ruling. A bitcoin sold at a loss and a bitcoin bought back the next day are the same property for any reasonable purpose.

If you trade as a business, losses are business losses and this rule does not drive your return. The rule matters for investors reporting capital gains and losses.

How Does The 30-Day Window Work?

One point on the first row catches people: with identical property, you are measured against what you hold, not which specific lot you thought you sold. Crypto has no lots under the average cost method, so every coin you hold of that type is "the same property".

Which Rebuy Tricks Look Safe, And Which Do Not?

Waiting 31 days is safe. Moving into a different coin is a common workaround, but it changes your exposure while you wait, and that is a real market risk for a month. Buying a Canadian bitcoin ETF to hold exposure is the one I get asked about most. Whether a spot bitcoin ETF unit and bitcoin itself are "identical" is not answered in the CRA pages I read, and I would not assume it is safe without a written opinion from an accountant. My list of bitcoin ETFs in Canada shows what those funds hold.

Buying inside a TFSA or RRSP while you sold outside is a separate trap. Your own registered account is not mentioned in the CRA's affiliated person examples in T4037, but it is a question for a professional because the consequences of a mistake sit inside the account. If you plan this kind of move, do not guess.

How Do You Report A Superficial Loss?

Report the disposition on Schedule 3 with proceeds and ACB as normal, then show the denied loss as an adjustment so the net allowable loss is nil. The denied amount is added to the ACB of the substituted property. The T4037 guide summarizes the loss rules and says no loss is allowed on a superficial loss, with the amount added to the cost base. Keep a note of the amount for the year you sell the replacement. Crypto tax software usually flags superficial losses for stocks, and many do not flag them for crypto, so check each report line yourself. Start with my ACB walk-through so the cost base is right first.

Does A Superficial Loss Matter If You Are Not Selling For A Loss?

No. If you sell for a gain the rule is irrelevant. It only turns up on losses. If you are planning a December tax-loss sale, run the numbers in the crypto tax calculator first, then read the main crypto tax guide for how losses apply against gains, which the CRA says can be carried back three years or forward indefinitely as net capital losses.

Worked Example: How A Denied Loss Moves To Your New Coins

Numbers here are illustrative. You buy 1 ETH for $4,000 and sell it on December 10 for $3,000, a $1,000 loss. On December 20 you buy 1 ETH again for $3,050 and you still hold it on January 9. The rebuy is inside the 30 days after the sale and you still own it 30 days after the sale, so the $1,000 loss is a superficial loss and you cannot claim it for the year. It is added to the cost base of the replacement coin: $3,050 plus $1,000 is $4,050. If you later sell that ETH for $4,500, your gain is $450, not $1,450. The loss was deferred, not erased, and it comes back when you finally sell without a rebuy.

That deferral is the reason the rule is annoying rather than catastrophic. The real damage is timing: a loss you expected to use against this year's gains does not show up, and your tax bill for the year is higher than you planned. If you have already crossed the line, you cannot undo it, so build the check in before you sell.

What Is A Safe Tax-Loss Selling Checklist For Crypto?

1. Look back 30 days. Scan your exchange history for any purchase of the same coin in the 30 calendar days before the sale. Recurring buys, dollar-cost averaging orders and staking auto-purchases count if they buy the same coin.
2. Pause automatic buys. Switch off recurring purchases of that coin for at least 31 days after the sale. An automatic Monday buy is the most common way people trigger the rule by accident.
3. Ask your household. The rule includes your spouse or common-law partner and a corporation either of you control, so a partner topping up the same coin can undo your loss.
4. Count 30 days from the sale, not from settlement. Use calendar days from the date of the sale and add a buffer. A sale on December 30 means the window runs into late January.
5. Record everything. Write down the sale date, the proceeds, your ACB and the date you plan to rebuy. If the CRA asks, your records have to show why the loss was allowed.

If you simply want to take a loss and do not care about keeping the exposure, none of this matters, because no rebuy means no superficial loss. And if you are holding at a gain, the rule never applies. For the maths on how much a loss is worth, see the crypto tax guide, where I explain that capital losses first offset capital gains and then carry back three years or forward without limit.