Crypto Losses in Canada: The Superficial Loss Rule
A crypto loss in Canada is deductible only against taxable capital gains, at half its size, and it is denied entirely when you or an affiliated person buy the same or an identical coin in the 61 days around the sale and still hold it 30 days later. Denied losses are not lost: the amount is added to the cost of the replacement coins. Stolen coins are a different question, and the Canada Revenue Agency's crypto pages do not answer it.
What a capital loss on crypto is worth, in order
Before any superficial loss question arises, the loss has to be a capital loss and it has to be usable. The CRA's page on reporting income from crypto-asset transactions sets out the order.
The general walkthrough of how the CRA taxes crypto is in our guide to crypto taxes in Canada; this page covers only what happens to a loss. So a $10,000 capital loss on crypto reduces your taxable income by at most $5,000 and only if you have capital gains to absorb it, this year or in the three prior years or later. That is why a loss that is denied matters: it removes a deduction that was already worth, at best, half its face value times your marginal rate. For your own figures, CalculatorVillage has finance calculators; the numbers on this page are illustrations.
The 61-day window, laid out on a calendar
The definition of superficial loss in section 54 of the Income Tax Act has two conditions. During the period that begins 30 days before the disposition and ends 30 days after it, you or a person affiliated with you must acquire a property that is, or is identical to, the property you sold. And at the end of that period, you or an affiliated person must own, or have a right to acquire, that substituted property.
Both conditions must hold. The first is about buying. The second is about still holding on day 30 after the sale. Here is how the dates fall for a sale on December 10, 2026.
| Date range | What it means |
|---|---|
| Nov 10, 2026 | First day of the look-back: 30 days before the sale |
| Nov 10 to Dec 9, 2026 | A purchase here counts as an acquisition in the period, even though it came before the sale |
| Dec 10, 2026 | Day of the sale (the disposition) |
| Dec 11, 2026 to Jan 9, 2027 | A purchase here counts as an acquisition in the period |
| Jan 9, 2027 | Last day of the period. Whatever you or an affiliated person own or have a right to acquire at the end of this day is tested |
| Jan 10, 2027 onward | A purchase on this day is outside the window |
Three consequences follow from the calendar.
The dispositions the definition carves out
Paragraphs (c) to (h) of the section 54 definition list dispositions that can never produce a superficial loss. Most are corporate or trust mechanics, but four matter to an individual holding crypto, and one of them connects directly to the bad-debt election discussed later on this page.
| Carve-out in the definition | In plain terms | When an individual with crypto meets it |
|---|---|---|
| Deemed dispositions under section 45(1) and section 70 | A change in the use of a property, and the deemed sale on death | Moving coins from personal use to income-earning use, or the final return of a deceased holder |
| Deemed disposition under section 128.1 | Becoming or ceasing to be a Canadian resident | Moving to or from Canada with a taxable position |
| Deemed disposition under section 50 | The election for a debt that has become a bad debt, or a share of a bankrupt corporation | A claim against a failed platform, if it qualifies as a debt |
| The expiry of an option | An option lapses unexercised | Rare for coins; relevant to option positions |
| Becoming or ceasing to be tax-exempt within 30 days after the disposition | The taxpayer's status changes under Part I | Mostly corporations and trusts |
The T4037 guide lists the same families as the common exceptions: a deemed sale on becoming or ceasing to be a resident, a change in use, becoming or ceasing to be exempt from tax within 30 days, a deemed sale on death, option expiry, and non-depreciable capital property disposed of by a corporation, partnership or trust. For that last group, the guide says the loss is not added to the cost base of the transferred property but is deferred until certain events occur.
Rights to acquire count as the property
Paragraph (i) of the definition adds a rule that surprises people. For purposes of the definition, "a right to acquire a property" is deemed to be a property identical to the property, except a right held only as security. The practical effect for shares is that an option or contract to buy within the window can substitute for the shares themselves, and the second condition asks whether you "owned or had a right to acquire" the substituted property at the end of the period.
None of the CRA's crypto pages says whether a crypto option, a futures position or a standing agreement to buy is a "right to acquire" a coin in this sense. The statute's wording is broad, so a derivative position opened during the window is a fact to raise with a professional and not to assume away.
When the loss is a business loss instead
The rule is written for capital property, and the T4037 guide introduces it that way: a superficial loss can occur "when you dispose of capital property." If your crypto activity is carrying on a business, the CRA's income page says you report the full amount of your profit or loss as business income, and the inventory-based example on that page computes cost of goods sold from opening inventory, purchases and closing inventory. In that calculation there is no per-sale loss to deny and no halving.
That is not an invitation to choose the treatment. The CRA decides business versus capital on all the facts, using frequency, holding period, knowledge, time spent, financing and advertising, and an isolated transaction can still be an "adventure or concern in the nature of trade." A reader who sells at a loss every few weeks and buys back should read the factors list before assuming either label.
Who is "affiliated" with you
The rule reaches purchases by people and entities other than you. Section 251.1 of the Act lists who is affiliated, and the CRA's T4037 guide gives the common examples: you and your spouse or common-law partner; you and a corporation controlled by you or your spouse; a partnership and its majority-interest partner; and a trust and its majority-interest beneficiary.
The statute's trust rule is the one that catches registered accounts. Paragraph 251.1(1)(g) makes a person and a trust affiliated if the person is a majority-interest beneficiary of the trust. Practitioner commentary applies that to an RRSP or TFSA trust of which you are the sole annuitant or holder. The statute's wording was checked for this page, but no CRA interpretation on the point was found, so treat the registered-account application as the common reading and not as a quoted CRA position.
| Who buys the replacement | Counts as an acquisition by an affiliated person? |
|---|---|
| You, in the same account | Yes |
| You, in a different exchange account | Yes. It is the same person |
| Your spouse or common-law partner | Yes |
| A corporation you control | Yes |
| Your own TFSA or RRSP (if you are the majority-interest beneficiary) | Yes, on the common reading of section 251.1 |
| A friend, sibling or parent | Not on the face of the list, though other rules can apply |
The registered-account trap
The most expensive version of the mistake is selling a losing position in a non-registered account and buying the same asset inside your own TFSA or RRSP. The statute then does two things at once. The loss on the non-registered sale is a superficial loss, so it is nil. And the denied amount would normally be added to the cost base of the substituted property, but a TFSA does not use a cost base for tax purposes, so the benefit has nowhere to go.
Paragraph 40(2)(g)(iv) of the Act separately denies a loss on a disposition of property to a TFSA or RRSP trust under which you are a beneficiary or annuitant. The CRA's own guidance on TFSA losses points the same way for losses inside the account: its TFSA guide says losses incurred within a TFSA "cannot be claimed as a capital loss on your income tax and benefit return." Whether you can hold the coin itself in a registered account at all is a separate question, covered in our guide to crypto in a TFSA or RRSP.
Priya's partial denial, and the cost base afterward
Most explanations show an all-or-nothing case. Real positions are usually partial, because you sell some coins and buy fewer back. The numbers here are an illustration with invented prices, and the partial-denial formula comes from a CRA administrative position that was confirmed only through secondary summaries; see the note below the table.
Inputs. Priya holds 10 ETH in one pool with a total adjusted cost base (ACB) of $30,000, which is $3,000 per ETH. On December 10, 2026 she sells 4 ETH for $8,000 ($2,000 each). On December 22, 2026 she buys 3 ETH for $6,300 ($2,100 each) and holds them through January 9, 2027. No affiliated person trades ETH.
Step 1: the loss before any denial. The ACB of the 4 ETH sold is 4 times $3,000, or $12,000. Proceeds are $8,000. The capital loss is $4,000.
Step 2: the superficial portion. The formula, as reported in secondary summaries of CRA technical interpretation 2004-0073011E5, is:
superficial loss = (the least of S, P and B) divided by S, times L
where S is the number of units sold (4), P is the number acquired in the 61-day period (3), B is the number of identical units owned at the end of the period (9, which is the 6 left from the old pool plus the 3 new ones), and L is the loss (4,000). The least of 4, 3 and 9 is 3. So the superficial loss is 3 divided by 4, times $4,000, or $3,000.
Step 3: what you can claim. The remaining $1,000 of loss is an ordinary capital loss. At 50 percent it is a $500 allowable capital loss, available against taxable capital gains.
Step 4: the cost base afterward. Section 53(1)(f) adds the denied amount to the ACB of the substituted property. Identical units are averaged, so the pool is now:
| Piece | Units | ACB |
|---|---|---|
| Old coins left after the sale | 6 | $18,000 |
| New coins bought December 22 | 3 | $6,300 |
| Denied loss added | n/a | $3,000 |
| Pool after the window | 9 | $27,300 |
The average is $27,300 divided by 9, or $3,033.33 per ETH. Had there been no denial, the pool would be $24,300 over 9 units, or $2,700 per ETH. The denial did not cancel the $3,000. It raised the cost base, so it reduces a future gain or enlarges a future loss when the pool is sold.
Note on the formula. Paragraph 40(2)(g) of the Act sets a loss to nil "to the extent that it is" a superficial loss, which is the statutory hook for a proportional denial. The formula itself is not in the Act or in the CRA's T4037 guide, which has no partial-denial formula. It appears in published summaries of CRA technical interpretation 2004-0073011E5 from TaxTips.ca, CIBC and CoinTracking, which describe it as CRA administrative practice and give the same least-of-S-P-B calculation. The interpretation itself sits in a paid database and was not opened for this page, so the formula, and the point that B counts all identical units including ones bought before the window, rest on those secondary summaries. Confirm it with a professional before using it in a filing.
What counts as "identical" for coins
Section 54 applies when the substituted property "is, or is identical to," the one sold. For crypto, the Act has no definition. The CRA's T4037 guide defines identical properties as a group where "each property in the group is the same as all the others" and gives shares of one class and units of a mutual fund trust as the most common examples. An older CRA bulletin on the meaning of identical properties is often cited, and it is archived.
That leaves some questions that no CRA crypto page answers. The table sorts them by how confident the reading is and says what the reading rests on.
| Replacement purchase | Likely reading | What it rests on |
|---|---|---|
| The same coin on another exchange | Identical | Units of one coin are interchangeable, and ACB averaging already treats them as identical |
| A different coin (bitcoin sold, ether bought) | Not identical | Different assets; no CRA ruling found either way |
| A wrapped version of the coin | Open question | Depends on how closely it tracks and whether it is treated as the same property; no CRA position found |
| A different fiat-backed stablecoin | Open question | Each is a separate asset, but they are designed to be interchangeable in value |
| Units of a bitcoin ETF after selling the coin | Not identical on the usual reading | A fund unit is a different property from the coin, but the question has not been addressed in CRA crypto guidance |
Open questions stay open. The CRA's crypto pages do not mention the superficial loss rule at all, so none of these readings has been confirmed in the guidance written for crypto users. A professional who can see your facts is the right person to decide the wrapped and stablecoin cases.
Losses that are not superficial: stolen, lost and failed
Everything above assumes you disposed of coins. A different set of questions arises when coins disappear, and the sources are thin enough that it pays to be exact about what they say.
If a scam is involved, report it before anything else; our guide on how to report a crypto scam lists where, and the reports are also your documentation. The records you would want for any claim are the transaction hashes, the dates, the cost base of the coins and every message with the other party.
A full-year ledger, with a spouse and a year-end sale
The earlier example was a single partial denial. Real years have several trades, so here is a second illustration with invented numbers, laid out the way a working paper might look. Sam holds 2 BTC in one pool with an adjusted cost base of $120,000 ($60,000 each). Sam's spouse, Jo, has a separate account.
| Date | Who | Action | Price per BTC | Effect |
|---|---|---|---|---|
| Nov 3, 2026 | Jo | Buys 0.5 BTC | $48,000 | Acquisition by an affiliated person, inside Sam's window if Sam sells on Nov 20 |
| Nov 20, 2026 | Sam | Sells 1 BTC | $45,000 | Loss before denial: $60,000 minus $45,000 = $15,000 |
| Dec 15, 2026 | Jo | Still holds the 0.5 BTC | n/a | Condition two is met, because an affiliated person owns identical property 30 days after the sale |
| Jan 2027 | Sam | Reviews the year | n/a | The loss is partly superficial |
Apply the partial formula described earlier. S, the units sold, is 1. P, the units acquired in the 61-day period, is 0.5 (Jo's purchase). B, the identical units owned at the end of the period by Sam and affiliated persons, is 1 (Sam's remaining coin) plus 0.5 (Jo's) = 1.5. The least of 1, 0.5 and 1.5 is 0.5. The superficial portion is 0.5 divided by 1, times $15,000, or $7,500. The other $7,500 is an ordinary capital loss, and half of it, $3,750, is an allowable capital loss.
The $7,500 denied is added to the cost base of the substituted property, which here is Jo's 0.5 BTC. Jo's cost goes from $24,000 to $31,500. Sam does not get it back, and a household that does not compare notes can end up with the benefit sitting in the wrong person's records. That mismatch is the practical lesson: the rule is applied person by person, but the facts are household-wide.
Staking rewards and other receipts deserve the same scrutiny as purchases. Whether a reward received in the window counts as an acquisition of identical property is a question for a professional; the CRA's crypto pages describe how rewards are taxed as income but do not tie them to the superficial loss rule.
Frequently Asked Questions
What is the superficial loss rule for crypto in Canada?
It denies a capital loss when you or an affiliated person acquire the same or an identical property during the 30 days before or after the sale, and still own it, or have a right to acquire it, at the end of that 61-day period. The denied loss is added to the cost base of the replacement property.
Can I sell crypto at a loss and buy it back in Canada?
If you buy it back inside the 61-day window and still hold it 30 days after the sale, the loss is superficial and denied for now. You can usually add it to the replacement coins' adjusted cost base. A purchase outside the window does not trigger the rule.
Does my spouse buying the same coin affect my loss?
Yes. A spouse or common-law partner is an affiliated person under section 251.1 of the Income Tax Act. Their purchase in the window can make your loss superficial, and the denied amount is added to the cost base of the coins they hold.
Are crypto losses deductible against my salary?
No. Allowable capital losses, which are half of capital losses, can be deducted only against taxable capital gains. Unused amounts become net capital losses that can be carried back three years or forward indefinitely, per the CRA. Business losses are treated differently.
Does the superficial loss rule apply to bitcoin and ether swaps?
The rule applies to identical property. Bitcoin and ether are different assets, so a swap is not obviously caught, but no CRA ruling on crypto swaps was found. Wrapped tokens and stablecoins are open questions that depend on facts.
Can I claim a capital loss for stolen crypto in Canada?
The CRA's crypto pages do not address it. Its capital gains guide lists stolen property as a deemed sale, with compensation treated as proceeds. Whether a particular scam transfer qualifies is a legal question to take to a tax professional.
If the loss came from a platform failing rather than from a sale, the exchange bankruptcy guide shows how customer terms were read in past failures, and the Canada topic hub lists the other Canadian pages.
Source & Review Basis
This article is reviewed against the source types below. Source links are provided to help readers verify primary documents, market context, and methodology independently.
Business versus capital factors, 50 percent inclusion, allowable capital losses only against taxable capital gains, three-year carryback. Page dated December 2, 2025; checked October 23, 2026.
Statutory definition of superficial loss (30 days before and after, substituted property, still owned at period end) and compensation for property unlawfully taken as proceeds. Checked October 23, 2026.
Paragraph 40(2)(g)(i) sets a superficial loss to nil; (iv) denies a loss on a disposition to a TFSA or RRSP trust of which the taxpayer is a beneficiary or annuitant. Checked October 23, 2026. Lead-in words "to the extent that it is (i) a superficial loss" are in paragraph 40(2)(g), not in the section 54 definition. Checked October 23, 2026.
Lists affiliated persons: spouse or common-law partner, controlled corporation, majority-interest partner and majority-interest beneficiary of a trust. Checked October 23, 2026.
Denied superficial loss is added to the adjusted cost base of the substituted property. Checked October 23, 2026.
Superficial loss conditions and affiliated person examples, identical properties and ACB averaging, stolen property as a deemed sale, bad debt election. Checked October 23, 2026.