The superficial loss rule — DividendsCanada

Sell at a loss and buy back within 30 days and the loss is denied — not deferred to a better year, denied for that year and added to the cost base instead. A DRIP can trigger it without you placing a trade at all.

Tax-loss selling is a normal year-end exercise: realise a loss, use it against gains, keep the portfolio broadly where it was. One rule stands in the way, and a dividend investor can trip it without doing anything.

The rule

A capital loss is superficial, and denied, when both of these hold:

You or an affiliated person acquires the same or an identical property in the window running from 30 days before the sale to 30 days after it, and
that person still holds it at the end of that window.

Sixty-one days in total, counting the day of sale.

The loss is not deferred to a future year and is not lost outright either. It is added to the adjusted cost base of the repurchased holding, and comes back as a smaller gain — or a larger loss — whenever that position is eventually sold.

“Affiliated person” is wider than you

This is where the rule catches people who were being careful.

It includes you, your spouse or common-law partner, and a corporation controlled by either of you. Critically, it also includes your own registered accounts — an RRSP or a TFSA.

So:

Sell at a loss in your non-registered account, buy the same holding in your TFSA within 30 days: superficial, and worse than ordinary, because a cost base inside a TFSA is meaningless. The loss is denied and there is nothing to add it to. It is genuinely gone.
Sell at a loss, and your spouse buys the same thing in their account: superficial.
Sell at a loss in one non-registered account and buy in another of your own: superficial. Separate accounts are not separate people.

How a DRIP triggers it silently

Here is the version specific to dividend investors.

A dividend reinvestment plan is an acquisition. If a distribution reinvests within the 61-day window around a loss sale, you have acquired identical property — without placing a trade, without deciding anything, and possibly without noticing until the slip arrives.

Partial denial applies proportionally, so a small DRIP purchase against a large loss sale denies only a small part of it. But on a monthly payer the odds of landing in the window are high, and on a position held across several accounts the odds compound.

If you intend to harvest a loss on a holding with a DRIP running, suspend the DRIP first.

What “identical property” means

Shares of the same class of the same company. Units of the same fund.

Not identical: two different funds tracking the same index. That is the standard workaround — sell one broad Canadian dividend ETF, buy a different provider’s, keep the exposure, and the loss survives because the properties are not identical. Whether a given pair is genuinely distinct is a judgment call, and one worth checking rather than assuming.

The rule that makes it worth caring

Capital losses in Canada offset capital gains, not ordinary income. An unused net capital loss can be carried back three years or forward indefinitely.

So a denied loss is not always a disaster — it usually returns via the cost base. The exception is the registered-account case above, where it truly vanishes. That one is worth avoiding deliberately.

Where to go next

General information, not advice. Tax treatment depends on your circumstances and can change. Verify figures against the CRA and issuer documents before acting.