The Superficial Loss Rule Across RRSP, TFSA and a Spouse's Accounts: What Advisers Should Check
Published by 
Steffan Kharmaaiarvi, founder
Tax-loss selling is routine in Canadian non-registered accounts, and the superficial loss rule is where it goes wrong. The rule in section 54 of the Income Tax Act denies a capital loss when the same or an identical property is bought back within 30 days before or after the sale, by the client or by a person affiliated with the client, and is still held at the end of that window. A spouse's purchase counts. Whether a purchase in the client's own RRSP or TFSA counts is a question the guide does not answer directly, and the outcome there is worse: the loss can be lost for good. This note sets out the rule from the Act and CRA's guide, an illustrative worked example and what Borderfolio shows. It is decision support, not tax advice.
The rule
A superficial loss (Income Tax Act, s. 54) is a loss on the disposition of a property where both conditions hold:
- during the period that begins 30 days before and ends 30 days after the disposition, the taxpayer or a person affiliated with the taxpayer acquires the same or an identical property (the substituted property); and
- at the end of that period, the taxpayer or an affiliated person owns, or has a right to acquire, the substituted property.
The loss is nil for tax purposes (s. 40(2)(g)(i)). It is not lost outright: the amount is added to the adjusted cost base of the substituted property (s. 53(1)(f)), so it comes back when that property is sold. CRA's Guide T4037 says the same: the loss cannot be deducted, but can usually be added to the ACB of the substituted property.
The window is 61 days in all: the sale day plus 30 days on each side. A purchase in the 30 days before a sale counts as much as one after it, which catches clients who "double up" before selling the original lot.
Who is affiliated
Section 251.1(1) lists affiliated persons. For individual clients, the cases that matter most are:
- The client's spouse or common-law partner (para. (a)). A spouse buying back the units in their own account triggers the rule for the client.
- A corporation controlled by the client or the client's spouse (para. (b)), such as a holding company.
- A trust and its majority-interest beneficiary (para. (g)). T4037's list of examples includes this pair.
The Act describes an RRSP, RRIF, TFSA or FHSA as a trust governed by the plan, of which the client is the beneficiary or annuitant (the wording of s. 40(2)(g)(iv)). Neither the Act nor T4037 names these plans in the superficial loss context. Reading para. (g) with the guide's trust example, a purchase in the client's own registered plan counts as a purchase by an affiliated person. That is a reading, and Borderfolio labels it so.
Where the denied loss goes
- Client buys back in a non-registered account: the loss is added to the client's ACB of the new units.
- Spouse buys back: the substituted property is the spouse's, so the loss is added to the spouse's ACB under s. 53(1)(f), not the client's. The household keeps the loss; the client does not.
- Client's RRSP or TFSA buys back: the loss would be added to the ACB of units inside the plan, where ACB has no tax use. In practice the loss is gone.
- Transferring a loser into an RRSP, RRIF, TFSA or FHSA in kind: that is not a superficial-loss question at all. Section 40(2)(g)(iv) makes a loss on a disposition to a trust governed by those plans nil outright, whatever happens in the following 30 days. Selling in the taxable account and contributing cash avoids this, provided the plan does not then buy the same security within the window.
Exceptions
The definition does not apply to deemed dispositions under listed provisions, including section 70 (death) and section 128.1 (becoming or ceasing to be resident in Canada). A loss on the deemed disposition when a client emigrates is therefore not superficial, even if the client keeps the shares. See departure tax when a client leaves Canada.
A worked example (illustrative)
A client holds 1,000 units of a Canadian equity ETF in a non-registered account, ACB CAD 50,000. On 10 March 2026 they sell all 1,000 for CAD 42,000: a loss of CAD 8,000. Round, illustrative figures. Three versions of what happens next:
| Repurchase of 1,000 identical units | Loss for the client in 2026 | Where the CAD 8,000 goes |
|---|---|---|
| Client, non-registered, 25 March, for CAD 41,500 | 0 | Client's new ACB: 41,500 + 8,000 = CAD 49,500 |
| Spouse, own account, 20 March, for CAD 41,800 | 0 | Spouse's ACB: 41,800 + 8,000 = CAD 49,800 |
| Client's TFSA, 1 April, for CAD 41,200 | 0 | Inside the TFSA: no future tax use |
| Nobody until 10 April or later (the 31st day) | 8,000 | Allowable capital loss: 8,000 × 50% = CAD 4,000 |
The 50% is the inclusion rate T4037 gives for 2025. The window runs from 8 February to 9 April 2026; a purchase on 5 February, before the window opens, would not count, but one on 9 April would. If the units were bought back and sold again before 9 April, the second condition (still owned at the end of the period) would fail and the loss would stand.
What Borderfolio shows
- The rule is applied in the Canadian ACB replay. When the confirmed transactions show a loss followed or preceded by a purchase of the same security within 30 days, still held at the end, the denied part is computed in proportion to the units bought back and added to the ACB, and the cost-basis finding names the sale and the amount (s. 54).
- The client's own registered plans count. Purchases in the client's RRSP, RRIF, TFSA and FHSA are included, labelled as a reading of T4037's trust example.
- A household partner counts. With the client and spouse in a household, the partner's accounts are checked too. A loss denied by their purchase follows their units, not the client's ACB, and the finding says how much of the denied loss went to the partner or is lost for good in a registered plan.
Not modelled: purchases by a controlled corporation or another trust (not on file) and trades outside the imported history. Read with ACB for Canadian ETFs and the limits of the cross-border screens.
Frequently asked questions
How long is the superficial loss window?
The period begins 30 days before and ends 30 days after the sale. A purchase of the same or an identical property by the client or an affiliated person in that period, still owned at the end of it, makes the loss superficial.
Does my spouse buying the same ETF trigger the superficial loss rule?
Yes. A spouse or common-law partner is an affiliated person under s. 251.1(1)(a). The client's loss is denied and added to the ACB of the spouse's units.
What happens if the client's TFSA or RRSP buys the same security back?
Read with the trust example in CRA's guide, the loss is superficial: the plan is a trust of which the client is the beneficiary. The denied loss would be added to the cost of units inside the plan, where it has no tax use, so in practice it is lost.
Can a client transfer a losing position into their TFSA to use the loss?
No. A loss on a transfer to a trust governed by a TFSA, RRSP, RRIF or FHSA under which the client is a beneficiary or annuitant is nil under s. 40(2)(g)(iv).