If you wait until January 2027 to think about your 2026 taxes, you'll miss critical opportunities to reduce what you owe. The best time to lock in tax-saving strategies is before December 31, 2026, when certain doors close permanently for that tax year. Actions you take in the final weeks of the year can save you hundreds or even thousands of dollars, but only if you move quickly and know exactly which strategies have hard cutoff dates. The Canada Revenue Agency (CRA) treats December 31 as a hard boundary. Contributions you make after midnight on December 31, 2026, count toward the 2027 tax year, not 2026. This timing distinction affects everything from RRSP room to charitable donations to capital losses. Waiting until tax filing season in spring 2027 means you've already lost the chance to claim deductions that would have applied to your 2026 income. That's income you'll pay tax on at your full marginal rate instead of reducing it with a timely deduction. RRSP contributions made by December 31, 2026 reduce your 2026 taxable income. After that date, contributions go toward 2027 instead.
Yes, the CRA gives you until 60 days after the end of the tax year (usually March 2) to make contributions that count toward the previous year. However, contributions made after December 31, 2026 go toward your 2027 tax year limit, not your 2026 limit. Only contributions made by December 31, 2026 reduce your 2026 taxable income immediately.
A capital loss realized in January 2027 applies to your 2027 tax year and can only offset capital gains or income from 2027 onward. If you had capital gains in 2026 that you could have offset with a loss, you've missed that opportunity. This is why selling losing positions before year-end is sometimes a tax strategy.
No, the donation must actually be made and the receipt must be dated in 2026 to claim it on your 2026 return. A pledge or promise to donate does not count. If you intend to claim a donation on 2026, the money must leave your account and the charity must issue a receipt before December 31, 2026.
For most self-employed people and business owners, income is counted in the year it is earned, not when it is paid. An invoice issued in December 2026 is typically taxable in 2026, even if the client pays in 2027. However, some businesses use cash accounting where only money actually received counts. The timing of expense payments is generally more flexible.
A spousal RRSP contribution made by December 31, 2026 counts toward the contributing spouse's 2026 deduction, even though the money goes into the spouse's account. The money grows tax-free in the spouse's name, and when withdrawn later, it's taxed in the spouse's hands at that time. This is one of the main benefits of spousal RRSPs.