Tax-Loss Selling in Canada 2026: The December Deadline Is Not December 31
Reviewed by Bader A. Chowdry, CPA, CA, LPA on
Every December, Canadian investors sell losing positions on December 31, assume the loss lands in the current tax year, and are wrong. The Income Tax Act does not care what day you placed the trade. It cares what day the trade settled — and in 2026 those are two different years.
This article is about execution, not policy. For what actually changed in the capital gains rules for 2026 and what did not, read Capital Gains 2026: What Changed and What Didn’t. For the broader small-business picture, start at our capital gains tax guide for Canadian small business. What follows is the mechanics: the date, the trap, and the paperwork.
What is the actual deadline for tax-loss selling in 2026?
Wednesday, December 30, 2026. Canada settles equities on a T+1 basis, so a December 30 trade settles Thursday, December 31 — inside the 2026 tax year. A December 31 trade settles Monday, January 4, 2027, because January 1 is a statutory holiday and the weekend intervenes. That loss belongs to 2027, not to 2026.
The gain or loss is recorded in the tax year of the settlement date, not the trade date — the CRA’s long-standing administrative position, set out in Interpretation Bulletin IT-133. The working rule is that December 30 is the last trade date in any year unless December 30 or 31 falls on a weekend. In 2026 neither does, so December 30 stands with no adjustment.
Why does settlement date govern instead of trade date?
Because ownership does not transfer until settlement. Until then the buyer does not own the security and the seller has not disposed of it, and a disposition is what triggers a capital gain or loss under the Act. Before May 27, 2024 Canada settled on T+2, which gave a wider year-end margin. T+1 compressed that margin to a single business day; it did not move the cut-off to December 31.
This is the point most commentary gets backwards. Shortening the settlement cycle made the year-end window tighter in calendar terms and no more forgiving: there is still exactly one business day of slack, and in 2026 it is consumed by a four-day exchange closure. Anyone who reads “T+1” as permission to trade up to the final session will book a 2027 loss against a 2026 gain.
Which days is the TSX actually closed in late December 2026?
Two days, and both are easy to miscount. The Toronto Stock Exchange is closed Friday, December 25, 2026 for Christmas Day and closed Monday, December 28, 2026 for Boxing Day observed in lieu. That leaves three trading days in the final week — Tuesday the 29th, Wednesday the 30th and Thursday the 31st — and only the first two produce a 2026 loss.
So the practical harvesting window in the last week of the year is two days wide, not five, and it sits behind a four-day closure that begins on the Christmas weekend. Anyone waiting for a late-December bounce before deciding should note that the decision has to be made by the 30th, and that liquidity in those two sessions is thin by convention.
The superficial loss rule: the 61-day window that cancels the whole exercise
Getting the date right is worthless if the loss is denied. Under ITA s.54, a loss is a superficial loss — and therefore denied — where both of the following are true:
- During the period beginning 30 days before the disposition and ending 30 days after it, the taxpayer or a person affiliated with the taxpayer acquires a property that is, or is identical to, the property disposed of (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.
That is a 61-day window in total: 30 days before, the day of the disposition, and 30 days after. Once a loss is caught, ITA s.40(2)(g)(i) deems it to be nil.
Who counts as affiliated is where most readers go wrong. It is not only you. It includes your spouse or common-law partner, a corporation you control, and — critically — your RRSP and your TFSA.
The RRSP/TFSA repurchase trap: the loss is not deferred, it is gone
This is the single most expensive error in tax-loss selling, and it is expensive because of an asymmetry most investors never hear about.
Sell at a loss in a non-registered account and repurchase the identical security in another non-registered account inside the window, and the loss is denied — but it is added to the adjusted cost base of the replacement shares. You lose the timing, not the money; the benefit returns when you eventually sell the replacement.
Sell at a loss in a non-registered account and repurchase the identical security inside your RRSP or TFSA inside the window, and the loss is denied with no ACB addition — a registered plan has no cost base that can absorb it. The loss is permanently destroyed. You do not recover it in a later year, and you do not recover it on withdrawal.
The safe sequence, if you want the position inside a registered plan, is: sell in the non-registered account, contribute the cash to the plan, wait until the 30 days after the disposition have fully elapsed, and only then repurchase. For 2026 the TFSA annual limit is $7,000 and cumulative room for someone eligible since 2009 is $109,000; the RRSP dollar limit is $33,810. None of that room is the problem — the timing of what you buy with it is.
Two more places the rule bites quietly
Dividend reinvestment plans. A DRIP that buys a fractional share inside the 30-day window is an acquisition of identical property. Investors who have forgotten a DRIP is switched on routinely trip the rule on a purchase they never consciously made.
Identical properties and ACB averaging. Where you hold several lots of the same security, the Act treats them as identical properties and your cost base is the weighted average across the whole holding — not the specific lot you think you sold. You cannot cherry-pick a high-cost lot to manufacture a larger loss. Compute the average ACB first; the loss is usually smaller than the trade confirmation suggests.
What do I actually do with the loss once I have it?
Apply it first against your 2026 capital gains. Any excess becomes a net capital loss, which you can carry back three years — to 2023, 2024 or 2025 — using Part 5 of Form T1A, filed with your 2026 return, or carry forward indefinitely and claim on line 25300. Net capital losses offset only taxable capital gains.
Carrying back. A 2026 net capital loss applied to an earlier year’s taxable capital gains is claimed on Form T1A, Request for Loss Carryback, Part 5, filed with the 2026 return. You do not file an amended return for the earlier year yourself; the CRA reassesses it.
Carrying forward. Net capital losses have no expiry date. A loss from 2026 is as usable in 2040 as it is in 2027, and is claimed on line 25300 of the return.
One constraint catches people every year: a net capital loss can be applied only against taxable capital gains — not employment income, business income or interest. There is no annual ordinary-income offset in Canada.
The other is the inclusion rate. Because the rate has changed over the decades, a loss from a year with a different inclusion rate must be adjusted before it is applied to another year. For 2026 the inclusion rate is 50%. The proposed increase to 66.67% was cancelled — it is not law, it is not phasing in, and any 2026 planning built on a two-thirds inclusion rate is built on a rule that does not exist.
Case study: the $40,000 loss that became a $0 loss
The facts. A Mississauga incorporated professional — call her Dana — holds a Canadian bank ETF in a non-registered account with an adjusted cost base of $140,000 and a market value of $100,000. She also has a $62,000 taxable capital gain from selling a rental property earlier in 2026. Her plan: harvest the $40,000 loss in December to shelter the gain, and keep her exposure to the sector.
What she did. On Thursday, December 31, 2026 she sold the ETF. Two days later, in early January, she repurchased the same ETF inside her TFSA using contribution room she had available.
What went wrong — twice. First, the date. The December 31 trade settled January 4, 2027, so the disposition occurred in 2027 and the loss was not available against her 2026 gain at all. Her 2026 return reported the full $62,000 taxable capital gain with nothing to offset it.
Second, the repurchase. Her TFSA is affiliated with her, and the repurchase fell inside the 30 days after the disposition. The loss became a superficial loss under ITA s.54 and was deemed nil under ITA s.40(2)(g)(i). Because the substituted property sits in a registered plan, there was no ACB addition to recover it later. The $40,000 was not deferred. It was destroyed.
What the correct sequence looked like. Sell on or before Wednesday, December 30, 2026 so the trade settles December 31. Take the $40,000 loss into 2026, where it offsets the $62,000 gain and reduces the taxable amount to $22,000. If she still wants sector exposure, buy a non-identical fund — a different issuer tracking a different index — immediately, or hold cash and repurchase the original ETF after the 30-day window closes at the end of January 2027. Either route keeps the loss. Her TFSA contribution was never the problem; the timing of the repurchase inside it was.
One extra point for incorporated readers. Dana’s holdings are personal, but owner-managers holding marketable securities inside a corporation should note that the loss is trapped in the corporation and can shelter only corporate capital gains. That interacts with remuneration planning — see salary vs. dividends in Ontario for 2026 — and with the $1,275,000 (2026) lifetime capital gains exemption, which applies to qualified small business corporation shares and not to a portfolio of public securities.
The four-step year-end sequence
- Compute your realized gains for 2026 first. Harvesting losses with no gains to absorb them creates a carryforward, not a refund. That may still be worth doing — but know which one you are buying.
- Calculate the true ACB using identical-property averaging before you decide the trade is worth placing.
- Check the 61-day window in both directions. Look back 30 days for purchases you have forgotten — including DRIP purchases — and forward 30 days for anything you, your spouse, your corporation, your RRSP or your TFSA intends to buy.
- Place the trade on or before Wednesday, December 30, 2026. Not December 31.
Three things this article deliberately does not tell you
It does not tell you whether harvesting is right for your situation — that depends on your marginal rate now versus later, your carryforward balance, and what else is happening in your 2026 return. It does not cover superficial loss rules on crypto assets, which follow the same ITA s.54 logic but raise separate identical-property questions. And it does not cover losses on shares of a corporation you control, where the stop-loss and affiliated-person rules are considerably more involved than the retail case above.
Frequently asked questions
What is the last day to sell stocks for a 2026 tax loss in Canada?
Wednesday, December 30, 2026. Under T+1 settlement, a December 30 trade settles December 31, 2026, so the disposition falls in the 2026 tax year. A December 31, 2026 trade settles Monday, January 4, 2027 and the loss belongs to 2027.
Does the superficial loss rule apply if I buy the shares back in my TFSA?
Yes, and it is the worst version of the rule. Your TFSA and RRSP are affiliated with you. If you repurchase the identical security inside a registered plan within the 61-day window, the loss is denied under ITA s.54 and deemed nil under ITA s.40(2)(g)(i) — and because a registered plan has no adjusted cost base to absorb it, the loss is permanently lost rather than deferred.
How far back can I carry a 2026 capital loss?
Three years — against taxable capital gains in 2023, 2024 or 2025 — using Part 5 of Form T1A, Request for Loss Carryback, filed with your 2026 return. Losses can also be carried forward indefinitely and claimed on line 25300. Net capital losses can offset only taxable capital gains, not employment or business income.
Is the capital gains inclusion rate 50% or 66.67% for 2026?
50%. The proposed increase to 66.67% was cancelled and is not law. Any 2026 planning built on a two-thirds inclusion rate is built on a rule that does not exist.
Can I sell at a loss and have my spouse buy the same stock?
No. A spouse or common-law partner is an affiliated person under the Act, so a purchase by your spouse inside the 61-day window triggers the superficial loss rule exactly as a purchase by you would. The same applies to a corporation you control.
Important — informational only, not advice. Do not use this article to make any decision.
This article is published by Insight Accounting CPA Professional Corporation for general educational purposes only. It is not tax, legal, accounting, financial, or investment advice, and nothing in this article should be relied upon — by anyone, for any purpose — to make a business, tax, financial, accounting, legal, or investment decision.
Tax law, CRA administrative positions, court interpretations, and Ontario provincial rules change frequently, sometimes retroactively, and the content of this article may be incomplete, simplified, out of date, or wrong by the time you read it. The right answer for your specific situation depends on facts this article does not know — your structure, history, jurisdiction, filings, contracts, and goals.
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Insight Accounting CPA Professional Corporation is led by Bader A. Chowdry, CPA, CA, LPA — licensed by CPA Ontario under the Public Accounting Act, 2004. To engage us for situation-specific advice, book a free 30-minute discovery call.
