Tax-loss selling means selling an investment that is worth less than you paid for it, so the capital loss can offset your capital gains. Two things decide whether it works in 2026. First, the superficial loss rule: if you, or a person affiliated with you such as your spouse, buy the same or identical property in the 30 calendar days before or after the sale and still own it 30 days after, you cannot claim the loss. Second, timing: trade by Wednesday, December 30, 2026.
Table of contents
- Quick answer: will my loss count?
- What tax-loss selling actually does
- The superficial loss rule, in the Income Tax Act’s own terms
- Where a superficial loss goes: it is deferred, not always gone
- The last safe trading day for a 2026 loss
- If the loss is bigger than your gains: carry it back three years
- A year-end tax-loss selling checklist
- Frequently asked questions
- Get your losses on the right return before December 30
Quick answer: will my loss count?
| If this is true… | Then… |
|---|---|
| You sold at a loss, and nobody — you or an affiliated person — re-bought within the window | Claimable in 2026 |
| You or an affiliated person re-bought within the window and still held it on day 30 | Superficial, not deductible now |
| The loss is bigger than your 2026 gains | Becomes a net capital loss: carry it back 3 years or forward indefinitely |
You net the result on Schedule 3 of your T1 return, where you calculate and report your capital gains and losses. The rest of this guide works through each row in turn.
What tax-loss selling actually does
A capital loss offsets capital gains, not your employment income
A capital loss arises when you dispose of capital property — shares, ETF units, cryptocurrency held as an investment — for less than its adjusted cost base. Half of that loss, the allowable capital loss, reduces your taxable capital gains for the year; it generally cannot reduce salary or business income. That is the whole mechanism: realise a loss deliberately, in a year you also have a gain, and net the two on Schedule 3. We cover how a capital gain is calculated separately, so this guide stays on the loss side.
Key terms in plain English
A handful of terms carry the whole rule:
- Superficial loss — a capital loss denied because of a too-soon repurchase.
- Substituted property — the replacement property you (or an affiliated person) acquired.
- Identical property — property so similar to what you sold that a buyer would not prefer one over the other.
- Affiliated person — someone the Income Tax Act treats as close enough to you that their purchase counts as yours.
- Net capital loss — what is left once a capital loss exceeds the gains it offsets in a year.
The superficial loss rule, in the Income Tax Act’s own terms
The 61-day window: 30 days before, the sale, 30 days after
The rule sits in section 54 of the Income Tax Act, the statute the Canada Revenue Agency (CRA) administers. Under the Act, a loss is superficial if the taxpayer or an affiliated person acquires the same or identical property in the period beginning 30 days before and ending 30 days after the sale, and still owns it at the end of that period (ITA section 54). CRA’s Guide T4037, Chapter 5, “Superficial loss,” is the primary reference here. Where the loss is superficial, subparagraph 40(2)(g)(i) makes it nil for the year — not reduced, zero.
The second test people forget: do you still own it on day 30?
The window gets the attention, but the rule has a second condition that gets missed just as often: you, or the affiliated person who bought the substituted property, must still own it, or have a right to acquire it, at the end of the 30-day period after the sale. Sell it back out first and the repurchase generally stops counting.
Who counts as “you”: your spouse, your corporation, some trusts
This catches the most people, because “you” is wider than your own brokerage account. CRA lists these examples of affiliated persons: your spouse or common-law partner; a corporation controlled by you or your spouse; a partnership and its majority-interest partner; and a trust and its majority-interest beneficiary (CRA Guide T4037). Moving the repurchase to your spouse or a corporation you control does not escape the rule — section 251.1 defines who is affiliated.
Buying it back inside a registered account
A repurchase inside your own TFSA or RRSP can still make the loss superficial — a registered account is effectively a trust for its holder, which is on CRA’s affiliated-person list. The trap is worse than a simple denial: the loss is not deductible now, and the ACB addition sits where it generally cannot be used, since a registered account does not track cost base the way a non-registered one does. See how RRSPs and TFSAs differ.
Does it apply to crypto?
Yes. A crypto-asset held on capital account is capital property like any other, so a disposition can produce a capital gain or loss, and the superficial loss rule applies the same way — CRA’s guide to crypto-asset transactions confirms the capital-account treatment. Sell a token at a loss and buy it back inside the window, on any exchange, and the loss is denied just as a share repurchase would be. See how the CRA taxes crypto for the capital-versus-business question this assumes settled.
“Similar” is not “identical”: ETFs and share classes
The rule turns on “identical property,” not merely similar property. CRA’s archived bulletin IT-387R2, paragraph 1, defines identical properties as ones “the same in all material respects, so that a prospective buyer would not have a preference for one as opposed to another.” Two ETFs tracking the same index, or two share classes of one fund, are a facts-based question under that test — tracking the same benchmark does not make them identical, and a different ticker does not make them different.
Where a superficial loss goes: it is deferred, not always gone
If you bought it back yourself: added to your cost base
A superficial loss is not deductible when it occurs, but under paragraph 53(1)(f) it is generally added to the adjusted cost base of the substituted property, held by whoever acquired it. If you did the repurchasing, the addition raises your own cost base on the replacement units — in a non-registered account, that higher cost base reduces a taxable gain when you eventually sell for good. The loss is deferred, not lost.
If your spouse or your corporation bought it: the cost-base increase is theirs, the lost deduction is yours
This is the asymmetry that trips practitioners as often as clients. Paragraph 53(1)(f) puts the cost-base addition on whoever acquired the property, not whoever sold it. If your spouse repurchased, their cost base rises; you lose the deduction and get nothing back until they dispose of that property.
Worked example: sold 14 December, spouse repurchases 8 January
Priya sells 500 ETF units on Monday, December 14, 2026, realising a $9,000 loss. Her spouse buys 500 units of the same ETF on Friday, January 8, 2027 — day 25 after the sale — and still holds them 30 days after. The loss is superficial: Priya cannot deduct the $9,000, since it falls to nil under subparagraph 40(2)(g)(i). The $9,000 is instead added to her spouse’s cost base under paragraph 53(1)(f). Priya’s deduction is gone for 2026; her spouse’s cost base is $9,000 higher.
When the rule does not apply
Not every disposition-then-reacquisition is caught. CRA’s Guide T4037 lists exceptions in section 54(c)-(h) — among them a change in use, a disposition on death, an option’s expiry, or a deemed sale when you become or cease to be a resident of Canada. If a corporation, partnership, or trust disposes of non-depreciable capital property at what would otherwise be a superficial loss, subsection 40(3.4) suspends the loss instead — a different mechanic, worth flagging to whoever handles the entity’s corporate tax filing.
The last safe trading day for a 2026 loss
Trade by Wednesday, December 30, 2026
To claim a loss in the 2026 tax year, the disposition has to fall in 2026. To be safe, place the sale so it settles in 2026: under T+1 settlement, that means trading by Wednesday, December 30, 2026. Confirm cut-off times with your broker, since a trade placed late in the day can miss same-day execution.
Why your T5008 shows the settlement date
CRA’s T5008 slip records the settlement date of a securities transaction in Box 14 — Guide T4091 instructs filers to enter the settlement date there, the day a trade completes, usually a day or more after the trade itself. That is a reporting instruction for the slip, not a rule for which date governs a disposition — when in doubt, keep the buffer above.
Counting the 30 days around a December sale
A December sale puts the after-sale side of the window into the new year. The window still runs a full 30 calendar days forward regardless of year-end — it does not reset or shorten the count. Mark the exact day-30 date on a calendar as soon as you trade.
If the loss is bigger than your gains: carry it back three years
Net capital losses: back three years, forward indefinitely
If your allowable capital losses for 2026 exceed your taxable capital gains, the excess becomes a net capital loss. A net capital loss can be carried back to any of the three preceding tax years or forward to any future year, and generally only against taxable capital gains (ITA 111(1)(b); CRA Guide T4037 and Capital losses). For a 2026 loss, that reaches back to offset a taxable capital gain reported in 2023, 2024, or 2025.
Form T1A, Part 5: how the carryback is requested
To carry a net capital loss back, the CRA asks you to complete Form T1A, Request for Loss Carryback, and not to file an amended return for the earlier year. Part 5 of the form is specific to a net capital loss; you file it alongside your 2026 return rather than reopening the earlier year’s filing — the kind of filing detail our personal tax filing service handles routinely.
Worked example: a 2026 loss recovering tax on a 2023 gain
The inclusion rate is one-half (50%) for 2026 — the proposed increase to two-thirds was cancelled, per CRA’s What’s new for corporations page. Say Daniel realises a $20,000 loss in 2026 with no gains, so his allowable capital loss is $10,000. In 2023 he reported a $10,000 taxable capital gain. On Form T1A, Part 5, he applies the $10,000 net capital loss against that 2023 gain — recovering tax paid three years earlier.
A year-end tax-loss selling checklist
- List every non-registered position worth less than its adjusted cost base.
- Check every account you, your spouse and your corporation control for purchases of the same or identical property before the planned sale.
- Decide what, if anything, you will buy instead, and confirm it is not identical property.
- Place the sale early enough to settle inside the tax year, and keep the trade confirmation.
- Diary the end of the after-sale window before anyone in the household re-buys.
- Bring your prior three years’ capital gains to your accountant to decide between using, carrying back or carrying forward the loss.
Frequently asked questions
It denies a capital loss where you, or a person affiliated with you, buy the same or identical property in the 30 days before or after the sale and still hold it 30 days after (ITA section 54). The loss is not deductible that year; it is generally added to the replacement property’s cost base instead.
Yes, as long as the repurchase falls outside the window, or you repurchase inside it but no longer hold the position 30 days after. Buying back early and still holding on day 30 triggers the rule.
Yes. CRA treats a purchase by your spouse or common-law partner as an affiliated-person purchase under section 251.1, so it makes your loss superficial just as if you had bought the shares back yourself, even though you file separate returns.
No. Under paragraph 53(1)(f), the amount is generally added to the substituted property’s adjusted cost base, held by whoever acquired it. The deduction is deferred, not permanently denied — though inside a registered account, that addition can be hard to use.
To be safe, trade by Wednesday, December 30, 2026, so the transaction settles within the 2026 tax year under standard T+1 settlement. Confirm your broker’s cut-off times well before the deadline, since settlement conventions and platform-specific cut-offs can vary.
Generally, no. An allowable capital loss can only reduce a taxable capital gain, not salary or business income. The main exception is on death: in the year of death and the year before, remaining net capital losses can also reduce other income (CRA: net capital losses on a final return). Excess losses become a net capital loss, available for carryback or carryforward.
Three years back, or forward indefinitely, generally applied only against taxable capital gains (ITA 111(1)(b)). It is requested on Form T1A, Part 5, filed with the return for the year the loss arose — you do not amend the earlier year’s return.
Yes. A crypto-asset held on capital account is capital property, so a disposition can produce a capital gain or loss, and a loss on it is subject to the same superficial loss rule as a share or ETF sale — including a too-soon repurchase on any exchange.
Get your losses on the right return before December 30
A realised loss only helps if it lands correctly on Schedule 3, or Form T1A for a carryback — the work our personal tax filing service does every year-end. Triple M Professional Corporation (TMP Corp), a Toronto CPA firm, works with families across Toronto, Markham, and Richmond Hill to plan year-end trades. If you have a paper loss to weigh before December 30, or a 2023–2025 gain a 2026 loss could offset, talk to us before you place the trade.
This article is general information current as of September 2026 and is not tax or legal advice. Tax-loss selling and the superficial loss rule depend on the precise facts of each holding, account, and household — speak with a qualified professional before acting on any of the above.