- Capital losses in Canada can only be used against capital gains — never against employment income, business income, or other types of income.
- Calculate your net capital loss for the current tax year on your return, after applying the current capital gains inclusion rate (as of mid-2026, 50% of a capital gain or loss is…
If you sold an investment at a loss this year but paid tax on a capital gain two or three years ago, you may be able to get some of that tax back. Canada's capital loss carryback rule lets you apply a net capital loss from this year against capital gains you already reported — and already paid tax on — in any of the three preceding tax years.
It sounds like a straightforward fix, but the request isn't automatic, and it only works within specific limits. This guide walks through how the carryback works, how to request it, and where taxpayers commonly go wrong.
The Basic Rule
Capital losses in Canada can only be used against capital gains — never against employment income, business income, or other types of income. When your capital losses for the year exceed your capital gains for the year, you're left with a net capital loss.
You have two options for that net capital loss:
- Carry it back up to three prior tax years, applying it against capital gains reported in any of those years; or
- Carry it forward indefinitely, applying it against capital gains in any future year.
You can also split a single year's net capital loss between the two — carrying part of it back and leaving the rest to carry forward — as long as the total doesn't exceed the loss available.
Step by Step: Requesting the Carryback
- Calculate your net capital loss for the current tax year on your return, after applying the current capital gains inclusion rate (as of mid-2026, 50% of a capital gain or loss is included for tax purposes — verify the current rate before relying on it, since this figure has been the subject of federal policy changes in recent years).
- Identify which of the past three tax years reported a net capital gain you paid tax on.
- File a request to carry the loss back — CRA provides a dedicated form (commonly Form T1A, Request for Loss Carryback) for exactly this purpose, filed along with or after your current-year return.
- CRA reassesses the earlier year(s) to reduce the capital gain reported in that year, which reduces the tax owing for that year and can generate a refund.
- Keep your records — the brokerage statements or transaction records supporting both the current-year loss and the original gain — in case CRA asks you to substantiate either side of the claim.
Carryback vs. Carryforward
| Carry It Back | Carry It Forward | |
|---|---|---|
| Applies against | Capital gains from the past 3 tax years | Capital gains from any future tax year |
| Best when | You had a taxable gain in a recent year and want a refund now | You expect larger gains later, or have no gains in the lookback window |
| How you claim it | A specific request filed with or after your return | Automatically tracked by CRA and carried forward on your notice of assessment |
| Time limit | 3 years back, and it must be a year with a reported gain | None — it carries forward indefinitely |
What Actually Counts as a Capital Loss
Not every declining investment produces a usable capital loss. A few things to watch for:
- The loss must come from a genuine disposition of capital property — shares, funds, real property held as an investment, and similar assets.
- Losses on personal-use property (like a car or personal belongings) are generally not deductible, even though gains on personal-use property can be taxable.
- The superficial loss rule can deny the loss if you (or an affiliated person, such as a spouse or a corporation you control) buy back the same or an identical investment within a short window around the sale. If that happens, the loss is typically added to the cost of the reacquired property instead of being usable right away.
- A loss only becomes available once it's actually realized — an investment that has simply dropped in value on paper doesn't create a claimable loss until you dispose of it.
Common Mistakes to Avoid
- [ ] Assuming the carryback happens automatically — it doesn't; you have to request it.
- [ ] Forgetting that the carryback only offsets capital gains, not your overall tax bill for that year.
- [ ] Repurchasing the same security too soon after selling it at a loss.
- [ ] Losing track of which of the past three years actually had a net capital gain to offset.
- [ ] Not keeping the original documentation for the prior-year gain, which CRA may ask you to reconfirm during the reassessment.
Frequently asked questions
Do I get an automatic refund once I file the carryback request?
Not immediately. CRA has to process the request and reassess the earlier year before any refund is issued, and reassessments can take time. You'll receive a revised notice of assessment for that earlier year once it's processed.
Can I choose which of the three years to apply the loss against?
Yes, within limits — you can direct how much of the loss goes to each of the three prior years, and how much (if any) you leave to carry forward instead, as long as you don't apply more than the gain reported in each of those years.
What if my losses are bigger than all my gains from the past three years combined?
Any amount you can't use against a prior year's gain simply carries forward indefinitely, to be applied against capital gains in any future year.
Does this apply to losses on a corporation's investments too?
Corporations follow a similar carryback-and-carryforward structure for their own capital losses, though the mechanics of the request differ from a personal return. A tax professional can confirm the right approach for a corporate filer.
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