The superficial loss rule and crypto

The rule in plain words

The superficial loss rule stops you from claiming a loss on property you effectively never gave up. CRA’s page “Capital losses and deductions” (modified 2026-02-05) says a superficial loss can occur when you dispose of capital property at a loss and both of these are true:

1. You, or a person affiliated with you, buy or have 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.
2. You, or that affiliated person, still own or have a right to buy the substituted property 30 calendar days after the sale.

The statutory definition is in section 54 of the Income Tax Act (consolidated to 2026-09-30). The rule is general: it applies to capital property, not just shares, and nothing in it excludes crypto-assets.

The window is wider than people expect

Because the window runs both before and after the sale, it spans 61 days including the sale day. A purchase made three weeks before you sell counts just as much as one made three weeks after.

This is why automatic recurring purchases can trigger the rule without you noticing. If you buy a fixed amount every week, a sale at a loss will almost always have a purchase within 30 days of it.

Who counts as affiliated

The rule looks beyond your own accounts. According to CRA’s page, affiliated persons include:

• You and your spouse or common-law partner.
• You and a corporation controlled by you or by your spouse or common-law partner.
• A partnership and a majority-interest partner of the partnership.
• A trust and a majority-interest beneficiary of the trust, or a person affiliated with that beneficiary.

So selling at a loss in your own name while your spouse buys the same asset in theirs can still produce a superficial loss. The affiliated-person rules have more detail than this list shows, and a tax professional can confirm how they apply to your household or company.

What happens to the denied loss

A superficial loss is not deductible. But it is usually not gone forever. CRA says “you can usually add the amount of the superficial loss to the adjusted cost base of the substituted property.” The loss is deferred into the units you bought back and can show up when you dispose of them later.

The math gets more involved when you buy back fewer units than you sold, or when you held some units throughout. In those cases only part of the loss may be denied, and a calculator or a tax professional is worth using.

CRA also lists exceptions where the rule does not apply, including when you become or cease to be resident in Canada, a change in use of the property, death, and the expiry of an option, among others.

What CRA hasn’t addressed for crypto

CRA’s crypto-asset pages, checked on 2026-10-30, do not mention superficial loss. The rule applies through the general definition, which turns on identical property. For many crypto situations, whether two holdings are identical is genuinely unclear, and CRA has not addressed it:

• A token and its wrapped version on the same network.
• The same token issued on two different networks through a bridge.
• Two different stablecoins that both track the Canadian or US dollar.
• A token and a liquid staking receipt token based on it.
• Units held directly and units represented by a receipt token in a lending pool.

We can’t tell you whether any of these pairs are identical for tax purposes. Neither can anyone else with certainty, because CRA hasn’t said. If you are relying on the difference, discuss it with a tax professional before the sale, not after.

How to check before you sell

1. List every purchase of the same asset by you and any affiliated person in the 30 days before the planned sale.
2. Pause any recurring purchases of that asset for the 30 days after.
3. Check whether you hold anything that might be argued to be identical, such as wrapped or bridged versions.
4. If you do rebuy, add the denied loss to the new units’ ACB in your records.
5. Talk to a tax professional if wrapped, bridged or receipt tokens are involved.

The superficial loss calculator and the sell and rebuy within 30 days scenario on our sibling site show how the window and the ACB adjustment work with your own numbers.

Your checklist

• Check for purchases of the same asset 30 days before the sale, including by your spouse or your corporation.
• Pause automatic purchases of that asset for 30 days after the sale.
• Note any wrapped, bridged or receipt tokens that might be treated as identical.
• If a loss is denied, add it to the ACB of the substituted units in your records.
• Talk to a tax professional before relying on two tokens being different.

Sources and dates

• Capital losses and deductions — superficial loss — Canada Revenue Agencyin force
  Page date 2026-02-05 · checked 2026-10-30. Superficial loss: identical property bought 30 days before/after and still held 30 days after; loss denied and usually added to the substituted property's ACB.
• Income Tax Act, s. 54 (definition of superficial loss) — Justice Laws Websitein force
  Page date 2026-09-30 · checked 2026-10-30. Statutory definition of superficial loss.
• Special rules and other transactions — identical properties — Canada Revenue Agencyin force
  Page date 2026-02-05 · checked 2026-10-30. Average-cost ACB for identical properties, recalculated on each purchase; dispositions don't change per-unit ACB (worked example ends at $20.63).
• Information for crypto-asset users and tax professionals — Canada Revenue Agencyin force
  Page date 2025-10-29 · checked 2026-10-30. CRA's current crypto-asset guidance set (replaced the older 'Guide for cryptocurrency users').