Small Business Tax Deductions Canada 2026: 25 Expenses You Can Claim

Tax deductions are the most straightforward way to reduce your small business tax bill. Every legitimate expense you claim reduces your taxable income dollar-for-dollar. At Ontario's combined small business rate of 12.2%, claiming an additional $10,000 in deductions saves $1,220 in tax. At the personal marginal rate (up to 53.53% for sole proprietors), the same deductions could save over $5,000.

Yet many business owners leave money on the table by missing eligible deductions or failing to keep adequate records. This guide covers 25 expenses you can legally claim, how to document them, and the rules that apply in 2026. For a deeper guide to business tax planning, visit our companion resource or learn about our business planning services.

The 25 Deductions: Complete List

1. Home Office Expenses

If you use part of your home regularly for business, you can deduct a proportional share of your housing costs. Two methods:

• Simplified method: $2 per day worked from home, up to a maximum per year. Simple to claim, no receipts required for the home office portion.
• Detailed method: Calculate the percentage of your home used for business (by area), then apply that percentage to rent or mortgage interest, property taxes, utilities, home insurance, and maintenance. If your office is 200 sq ft in a 1,200 sq ft home, you can deduct 16.7% of eligible costs.

2. Vehicle Expenses

Deduct the business-use percentage of: fuel, insurance, maintenance, licence fees, lease payments (up to prescribed limits), or CCA on the purchase price. You must maintain a mileage log recording every business trip with date, destination, purpose, and kilometres. The CRA audits vehicle expenses frequently.

3. Meals and Entertainment

Deductible at 50% of the cost. Must be directly related to earning business income. Record the date, amount, who was present, and the business purpose on each receipt. Client lunches, business dinners, and meals while travelling for business all qualify.

4. Advertising and Marketing

Fully deductible: website costs, Google Ads, social media advertising, print ads, business cards, signage, trade show displays, and promotional materials. Note: advertising in non-Canadian media directed at a Canadian market may have restrictions.

5. Professional Fees

Accounting fees, legal fees, bookkeeping costs, and consulting fees related to your business are fully deductible. This includes the cost of preparing your corporate tax return, GST/HST returns, and payroll.

6. Insurance

Business insurance premiums are fully deductible: commercial general liability, professional liability (errors and omissions), commercial property insurance, business interruption insurance, and key person insurance. Note: life insurance premiums are generally not deductible unless assigned as collateral for a business loan.

7. Utilities

Electricity, gas, water, and heating costs for your business premises. If you work from home, deduct the business-use percentage under the detailed home office method.

8. Rent

Rent for commercial office space, retail space, warehouse, or storage is fully deductible. For home-based businesses, the business-use percentage of your rent is deductible under the detailed method.

9. Office Supplies

Pens, paper, printer ink, postage, stationery, cleaning supplies, and other consumable office materials. These are straightforward deductions - keep your receipts.

10. Training and Education

Courses, workshops, seminars, and conferences that maintain or improve skills required for your current business are deductible. This includes online courses, professional development, and industry certifications. Training for an entirely new career or business is generally not deductible.

11. Software and Subscriptions

Business software subscriptions: accounting software (QuickBooks, FreshBooks), CRM systems, project management tools, cloud storage, design software, and industry-specific applications. Annual subscriptions are expensed in the year paid.

12. Phone and Internet

Business phone lines are fully deductible. If you use a personal phone for business, deduct the business-use percentage. Internet costs follow the same rule - if 60% of your internet use is business-related, deduct 60% of the cost.

13. Capital Cost Allowance (CCA) on Equipment

Rather than deducting the full purchase price of capital equipment in one year, you claim CCA over the asset's useful life. Common CCA classes:

14. Bad Debts

If a customer owes you money and you have made reasonable efforts to collect but cannot, you can write off the debt as a bad debt expense. You must have previously included the amount in your income. Keep documentation of your collection efforts.

15. Bank Fees and Interest

Monthly account fees, transaction fees, wire transfer charges, credit card processing fees (Stripe, Square), and interest on business loans and lines of credit are all deductible. Interest on money borrowed for business purposes is deductible even if the loan is in your personal name, provided the funds were used for business.

16. Travel Expenses

Airfare, hotels, ground transportation, and incidental expenses for business travel are deductible. Meals during travel follow the 50% rule. The travel must have a clear business purpose. Keep detailed records of the business reason for each trip.

17. Conventions and Trade Shows

You can deduct the cost of attending up to 2 conventions per year if they are related to your business. This includes registration fees, travel, and accommodation. The convention must be held within the geographical area of the sponsoring organization.

18. Professional Memberships and Dues

Membership fees for professional associations, industry organizations, chambers of commerce, and licensing bodies are deductible. Club dues for recreational or social clubs are generally not deductible, even if you use the club for networking.

19. Employee Salaries and Benefits

Salaries, wages, bonuses, vacation pay, and employer-paid benefits (CPP contributions, EI premiums, health benefits) are fully deductible. This includes salaries paid to family members, provided the amount is reasonable for the work performed.

20. Contractor and Subcontractor Payments

Payments to independent contractors, freelancers, and subcontractors are fully deductible. If you pay a single contractor $500 or more in a calendar year, you must file a T4A slip reporting the payments. Failure to file T4A slips can result in penalties.

21. GST/HST Input Tax Credits

If you are GST/HST-registered, you recover the GST/HST paid on business purchases through input tax credits on your GST/HST return. This effectively makes the sales tax on your business expenses refundable. File regularly to maintain cash flow.

22. Delivery, Freight, and Shipping

Courier costs, postage, shipping supplies, and freight charges for business purposes are fully deductible. This includes the cost of shipping products to customers and receiving inventory.

23. Repairs and Maintenance

Repairs to business property, equipment, and vehicles are deductible as current expenses. However, improvements that extend an asset's useful life or increase its value are considered capital expenditures and must be depreciated through CCA rather than expensed immediately.

24. Business-Use-of-Home Insurance

The business-use percentage of your home insurance premium is deductible under the detailed home office method. If your office represents 15% of your home, you can deduct 15% of your home insurance premium.

25. Start-Up Costs

Costs incurred before your business starts operating - market research, business plan development, legal fees for incorporation, initial inventory - are generally deductible in the first year of business or amortized over time. Keep detailed records of all pre-opening expenses.

Common Mistakes That Trigger CRA Audits

• Claiming 100% business use on a personal vehicle: The CRA knows most vehicles have some personal use. Be honest about the split.
• No mileage log: Without a contemporaneous log, your vehicle expense claim will be denied in an audit.
• Meals without business purpose documented: "Dinner" is not a business purpose. "Client dinner with [name] to discuss [project]" is.
• Overstating home office percentage: Measure your office space accurately and use the actual percentage.
• Missing T4A slips for contractors: CRA cross-references contractor payments. Missing slips raise red flags.
• Mixing personal and business expenses: Use a separate business bank account and credit card. Commingled finances are an audit magnet.

Record-Keeping Best Practices

CRA requires you to retain all business records for at least 6 years from the end of the relevant tax year. Best practices:

1. Use cloud accounting software (QuickBooks, FreshBooks, Wave) to track all income and expenses
2. Photograph or scan every receipt immediately - paper fades and gets lost
3. Maintain a separate business bank account and credit card
4. Keep a contemporaneous mileage log (apps like MileIQ automate this)
5. Record the business purpose on every meal and entertainment receipt
6. Back up digital records in at least two locations

Disclaimer: This article provides general information only and does not constitute tax or legal advice. Tax rules change frequently and individual circumstances vary. Always consult a qualified CPA or tax professional for advice specific to your business situation.