Year-End Tax Moves for Canadians Before December 31, 2026

Year-end tax checklists tend to blur two different kinds of deadlines together: things that genuinely must happen by December 31, and things that feel urgent but actually have more flexibility than most people assume. Getting that distinction right matters more than the checklist itself.

What actually has a December 31 deadline

Tax-loss selling. Selling an investment at a loss in a non-registered account to offset capital gains elsewhere needs to settle before the year ends — and because trades take a few business days to settle, the trade itself has to happen before the last trading day of the year, typically a few business days ahead of December 31, not on the day itself. Check your brokerage's specific cutoff.

The superficial loss rule applies to any loss claimed this way. If you, your spouse, or a corporation you control buys back the same or an identical investment within 30 calendar days before or after the sale, the CRA disallows the loss entirely. A loss sold and repurchased inside that window doesn't reduce your tax bill — plan the timing carefully if you intend to hold the position again later.

FHSA contributions. Unlike an RRSP, an FHSA has no grace period into the next year. A contribution has to land inside the calendar year to count toward that year's $8,000 annual room and deduction — a contribution made in early January counts toward the following year instead.

Charitable donations. To claim a donation tax credit for 2026, the gift needs to be made — and the receipt dated — by December 31, 2026. Online or credit-card donations made on December 31 itself generally still count for that year; mailed cheques are typically judged by postmark date.

Q4 tax instalments. For individuals required to pay quarterly tax instalments (generally those with net tax owing above $3,000 in the current year and either of the two prior years — $1,800 for Quebec residents), the fourth 2026 instalment is due December 15, 2026. This commonly applies to people with significant investment, rental, or self-employment income not subject to withholding at source.

What does not need to happen by December 31

This matters because RRSP-related year-end messaging is everywhere in December, often implying urgency that doesn't actually exist for this specific account. There's nothing wrong with contributing before year-end if the money is available — but waiting until January or February, within the 60-day window, costs nothing in terms of the deduction itself.

A worked example

Daniel has $4,000 in unrealized capital gains from a stock sale earlier in 2026, and also holds a separate investment currently down $4,000 from what he paid for it, which he's no longer confident in.

• If he sells the losing position before the year's last trading day, the $4,000 loss offsets the $4,000 gain, reducing his 2026 taxable capital gain to $0.
• If he sells and buys back the same investment within 30 days (for example, because he changes his mind), the superficial loss rule disallows the loss entirely — his $4,000 gain remains fully taxable, and the disallowed loss instead gets added to the adjusted cost base of the repurchased shares, deferring the benefit rather than eliminating it completely.
• Separately, Daniel's FHSA has $3,000 of unused room for 2026. Contributing before December 31 locks in a 2026 deduction; waiting until January means that same contribution instead counts toward 2027's room, not 2026's — a real difference for an account that, unlike the RRSP, offers no grace period.

A simple year-end checklist

1. Review non-registered investment accounts for any positions worth tax-loss selling, and place those trades with enough buffer before the last trading day of the year to settle in time.
2. Confirm the 30-day superficial loss window before repurchasing anything sold at a loss, including in a spouse's account.
3. Make any intended FHSA contribution before December 31 if claiming the deduction for 2026 specifically matters — this is the one registered account among TFSA/RRSP/FHSA with a real calendar-year cutoff.
4. Finalize charitable donations with enough lead time for a receipt to be dated in 2026, particularly for anything mailed rather than made online.
5. Confirm whether a December 15 instalment payment applies to you — check your most recent Notice of Assessment or CRA My Account for instalment reminders if your income includes investment, rental, or self-employment earnings.
6. Leave RRSP contributions for whenever makes sense for cash flow — there's no need to rush this one before year-end specifically.

Common mistakes

• Rushing an RRSP contribution under false year-end pressure. The real deadline is 60 days into the following year — spreading contributions out, or timing them to a higher-income year, is often the better strategy than a December scramble.
• Repurchasing a tax-loss-sold investment too soon. Even an unintentional repurchase within 30 days triggers the superficial loss rule and disallows the loss.
• Waiting until December 31 itself to place a tax-loss trade. Trades need to settle before year-end, which means the trade date has to be a few business days earlier — check your brokerage's specific cutoff well ahead of the holidays.
• Forgetting the FHSA has no grace period. Treating it like an RRSP and assuming an early-January contribution still counts for the prior year is a genuine, costly mistake specific to this account.

Sources

• Payment due dates for individual income tax instalments — Canada Revenue Agency
• Capital gains and losses — Canada Revenue Agency
• First Home Savings Account (FHSA) — Canada Revenue Agency

This article is for general educational purposes only and does not constitute tax or financial advice. Deadlines and rules referenced here reflect the structure of these programs as of October 2026 — confirm specific dates and your own instalment requirement with the CRA or a qualified tax professional before year-end.

What to do next

For how the FHSA's contribution room and deadline fit into its full mechanics, see FHSA Explained. For the broader comparison between TFSA, RRSP, and FHSA priority, see TFSA vs. RRSP vs. FHSA.