Small Business Tax Guide: What Every Alberta Business Owner Must Know

Sole Proprietor vs Corporation

Sole proprietors report business income on their personal T1 (T2125), paying tax at personal marginal rates. Corporations file a T2 and benefit from the 9% small business deduction on the first $500,000 of active income. Incorporation provides liability protection and income deferral but adds filing complexity. Ahmed evaluates which structure suits your revenue, goals, and risk tolerance.

GST Registration for Small Businesses

GST registration is mandatory when your taxable revenue exceeds $30,000 in a quarter or four consecutive quarters. You can register voluntarily earlier to claim input tax credits on startup purchases. Alberta charges GST at 5% with no provincial HST. Ahmed handles registration and sets up correct tracking from day one.

• $30,000 threshold: Mandatory registration when revenue exceeds this in a quarter or four consecutive quarters.
• Voluntary registration: Register earlier to claim ITCs on startup expenses.
• Alberta rate: GST only at 5% — no provincial HST.

Eligible Business Expenses

Business expenses must be incurred to earn business income and be reasonable in amount. Common eligible expenses include advertising, office supplies, professional fees, insurance, rent, utilities, and software subscriptions. Personal expenses are not deductible — mixing personal and business expenses is the #1 CRA audit trigger. Ahmed ensures proper categorization.

• Advertising: Marketing, website, social media, print advertising.
• Office expenses: Supplies, software, small equipment under $500.
• Professional fees: Accounting, legal, consulting directly related to business.
• Insurance: Business liability, property, and professional insurance.
• Rent and utilities: Business premises — apportioned if home-based.

Home Office Deduction (T2125)

If you run your business from home, you can deduct a portion of home expenses as business-use-of-home. The percentage is calculated by the area of your workspace relative to your total home area. Eligible expenses include rent, utilities, property tax, home insurance, and maintenance. You cannot create a loss with home office expenses — they're limited to business income.

• Calculation: Workspace area ÷ total home area = deductible percentage.
• Eligible expenses: Rent, utilities, property tax, insurance, maintenance.
• No loss creation: Home office expenses can't exceed business income — excess carries forward.
• Exclusive use: The workspace should be used primarily for business.

Vehicle Expenses and the Logbook Requirement

Vehicle expenses are deductible for the business-use portion only. You must maintain a detailed mileage log showing date, destination, purpose, and kilometers for each business trip. Without a logbook, CRA will deny the entire vehicle expense claim. Eligible expenses include fuel, insurance, maintenance, registration, and depreciation (CCA).

• Mileage log: Mandatory — date, destination, purpose, kilometers for each trip.
• Business vs personal: Only the business-use percentage is deductible.
• Eligible expenses: Fuel, insurance, maintenance, registration, CCA.
• No log = no deduction: CRA will deny the entire claim without a logbook.

7 Tax Mistakes Tax Auditors See Most

Ahmed spent 5 years conducting CRA business tax audits. These are the seven most common mistakes he saw small business owners make — each one can trigger a reassessment, penalties, and interest. Avoiding them from the start is far easier than fixing them after a tax notice arrives.

• 1. Personal expenses in business: Mixing personal and business expenses — the #1 audit finding.
• 2. No mileage log: Claiming vehicle expenses without a detailed logbook — claim denied.
• 3. Inflated home office: Claiming more than the actual workspace percentage.
• 4. Missing receipts: Claiming expenses without supporting receipts.
• 5. Contractor misclassification: Treating employees as contractors to avoid CPP/EI.
• 6. Late GST registration: Not registering when hitting the $30,000 threshold.
• 7. No year-end planning: Missing CCA, salary, and dividend timing opportunities.

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