Most agents wait until March to think about taxes, then scramble to find receipts and justify deductions to their accountant. That approach costs money. The final six weeks of the calendar year offer specific opportunities to reduce your tax bill that disappear on January 1st. This checklist covers the concrete moves you should evaluate before December 31st, with particular attention to the self-employed structure most Canadian agents operate under.

These aren't theoretical tax strategies. They're specific actions tied to CRA rules, filing deadlines, and the unique expense structure of commission-based income. Some will save you hundreds of dollars. Others might save thousands. All require action before the year closes.

Maximize Your Home Office Deduction

If you're using the detailed method for home office expenses, December is when you finalize your square footage calculation and gather utility bills. The CRA allows you to deduct a proportionate share of your home expenses—mortgage interest or rent, property taxes, utilities, insurance, maintenance—based on the percentage of your home used exclusively for business. For an agent with a 150-square-foot office in a 1,500-square-foot home, that's 10% of eligible expenses.

The key word is "exclusively." Your kitchen table doesn't count. A dedicated room with a door does. If you've been casual about this designation, formalize it now. Take photos showing the space set up as an office. Print your floor plan with measurements. The CRA rarely audits home office claims under $5,000, but when they do, they want evidence the space meets the "principal place of business" test or is used "exclusively" for earning income and meeting clients.

Before year-end, pay your January mortgage or rent early if cash flow allows. The payment date determines which tax year claims the deduction. The same applies to your home insurance renewal—if it's due in early January, prepaying in December pulls that deduction into the current year. For an agent in the 43% marginal bracket in Ontario, a $12,000 annual home office deduction saves roughly $5,160 in combined federal and provincial tax.

Accelerate Deductible Expenses

The CRA allows you to deduct expenses incurred to earn commission income, but only in the year you pay them. This creates a December planning opportunity: pull forward expenses you'll incur anyway in Q1 2026.

Annual MLS fees, board dues, and E&O insurance renewals—if they're due in January or February, pay them in December
Marketing materials, business cards, signage orders—place and pay for them before December 31st even if delivery happens in January
Software subscriptions (CRM, transaction management, lead generation)—prepay annual plans rather than monthly
Professional development—register and pay for courses scheduled for early 2026
Vehicle expenses—if you're planning maintenance or repairs, schedule them for late December

The vehicle calculation deserves specific attention. If you use the detailed method (actual expenses rather than the CRA's per-kilometer rate), keep a log for the full year. The rate for 2025 is 70 cents per kilometer for the first 5,000 kilometers and 64 cents after that. Most agents with decent mileage do better with actual expenses—gas, insurance, lease payments, maintenance, depreciation—multiplied by the business-use percentage. If you drove 30,000 kilometers this year and 24,000 were business-related, you claim 80% of vehicle costs.

December is also when you should buy that laptop, phone, or camera you've been considering. The Accelerated Investment Incentive allows you to claim a larger percentage of depreciable property in the year of purchase. For most assets in Class 50 (computers and software), you can deduct 75% of the cost in year one rather than the standard 27.5%.

RRSP Contributions and Income Splitting

You have until March 1st, 2026 to make RRSP contributions for the 2025 tax year, but December planning determines how much room you have. Your contribution limit is 18% of your 2024 earned income, up to the 2025 maximum of $31,560, minus any pension adjustments. For most agents, that means 18% of last year's net commission income after expenses.

If you had a strong 2024 and expect a weaker 2025, consider maxing out your 2025 contribution room in December rather than waiting until February. This pulls the deduction into a potentially higher-income year. The reverse applies if 2025 was exceptional—you might wait and contribute against 2026 income when you're in a higher bracket.

For agents with spouses earning significantly less, a spousal RRSP contribution shifts future retirement income to the lower earner, reducing household taxes over time. The contribution uses your RRSP room but the funds belong to your spouse. When withdrawn, they're taxed at your spouse's rate, not yours. This strategy works particularly well if you're in the top Ontario bracket (53.53% on income over $246,752) and your spouse is in a lower bracket.

If you incorporated your real estate business, December is when you determine your salary versus dividend mix for the year. Salary creates RRSP contribution room and is deductible to the corporation. Dividends don't create RRSP room but may result in lower overall taxes depending on your province and total household income. This calculation requires your accountant's input, but the decision must be made before year-end because you need to process payroll before December 31st for the salary to count in 2025.

Capital Gains and Loss Harvesting

If you sold an investment property or rental in 2025, you're facing capital gains tax on 50% of the profit (or 66.7% on gains above $250,000 as of June 25th, 2025 under the new inclusion rate rules). December offers a chance to offset those gains by selling investments that have declined in value—a strategy called tax-loss harvesting.

Here's how it works: You bought shares in a REIT three years ago for $20,000. They're now worth $14,000. If you sell before December 31st, you realize a $6,000 capital loss. That loss offsets $6,000 of capital gains from your property sale, reducing your taxable gain. You can then repurchase the same REIT in January if you still want the exposure, though the CRA's superficial loss rules require you to wait 30 days before repurchasing or the loss is denied.

The calculation gets more complex with the new two-tier inclusion rate. Gains up to $250,000 are taxed at 50% inclusion. Gains above that threshold face 66.7% inclusion. If you're near the threshold, timing matters. An agent who sold a pre-construction condo in 2025 with a $240,000 gain might consider whether other capital gains push them over the limit. If so, harvesting losses becomes more valuable because they offset gains that would otherwise be taxed at the higher rate.

Capital losses can be carried back three years or forward indefinitely. If you have no gains in 2025, realized losses can offset gains from 2022, 2023, or 2024, generating a refund. File a T1-ADJ (T1 Adjustment Request) to apply the loss retroactively.

Charitable Donations and Political Contributions

Donations made by December 31st generate tax credits for 2025. The federal credit is 15% on the first $200 and 29% (or 33% on amounts over $235,675) on the excess. Provincial credits add another 5% to 20% depending on your province and income level. A $1,000 donation typically generates $400 to $500 in combined credits for a high-income agent.

If you're planning a large donation, consider donating appreciated securities instead of cash. When you donate publicly-traded shares, mutual funds, or segregated funds directly to a registered charity, you receive a tax receipt for the full market value but pay zero capital gains tax on the appreciation. An agent holding $10,000 in stocks with a $6,000 adjusted cost base would normally pay tax on a $4,000 gain when selling. Donating the shares directly eliminates that tax while still generating the donation credit on the full $10,000.

Political contributions follow different rules. Contributions to federal parties or candidates generate a 75% credit on the first $400, 50% on the next $350, and 33.33% on amounts up to the $1,700 annual limit. Provincial contribution limits and credit rates vary—Ontario's limit is $3,467 with a similar tiered structure. If you're politically active, maximize these contributions before December 31st.

Execute Before January

Pull your 2025 bank and credit card statements now, not in March. Flag every business expense. If you've been casual about receipts, request duplicates from vendors while the year is fresh. Schedule a December meeting with your accountant to review these moves—not a March appointment to file. Pay your Q4 installments if required (due December 15th for agents who owe more than $3,000 annually). Confirm your mileage log is complete and your home office calculation is defensible. The agents who treat December as tax month rather than April as tax month consistently pay less and stress less.