Every legitimate deduction available to Canadian small business owners — organized by category so you never miss a write-off.
Tax deductions are the most powerful tool small business owners have for reducing their CRA bill. By deducting legitimate business expenses from your revenue, you lower your net business income — and the income tax you pay on it. This guide covers every major category of deductible expenses for Canadian sole proprietors, partnerships, and incorporated small businesses.
The golden rule from the CRA: an expense is deductible if it was incurred "for the purpose of earning business income" and is reasonable in amount. Personal expenses dressed up as business expenses are the #1 audit trigger — don't go there.
If you work from home, you can deduct a proportion of your housing costs based on the square footage of your workspace relative to your total home. Eligible costs include rent, mortgage interest (not principal), utilities, home insurance, and property taxes. The workspace must be your principal place of business or used exclusively for business purposes and used regularly to meet clients.
If you rent commercial office space, 100% of the rent is deductible as a business expense. Co-working memberships (WeWork, Regus, etc.) are fully deductible. Even renting a private room within your home to your business on a market-rate basis may be partially deductible.
If you use a vehicle for business purposes, you can deduct a proportion of vehicle costs equal to your business use percentage. Track total kilometres driven and business kilometres (keep a mileage log or use apps like MileIQ). Deductible costs include:
Note: commuting from home to a regular office is NOT a business expense. Travel from your regular place of work to client locations IS deductible.
Wages paid to employees (including yourself if incorporated), salaries, bonuses, and fees paid to subcontractors for services rendered to your business are fully deductible. You must issue T4 slips for employees and T4A slips for contractors paid over $500/year.
Monthly SaaS subscriptions — accounting software, project management tools, design apps, communication platforms — are 100% deductible as current business expenses in the year paid.
Large equipment purchases (computers, cameras, machinery) are typically deducted over time through Capital Cost Allowance (CCA) rather than all at once. However, the Immediate Expensing incentive allows Canadian-Controlled Private Corporations and certain individuals to immediately write off up to $1.5 million of eligible depreciable property purchased after January 1, 2022.
Google Ads, Facebook/Instagram advertising, SEO services, print advertising, sponsorships, and promotional materials are fully deductible. Website development and hosting costs are deductible, either as current expenses (hosting, domains) or capital costs (major website builds amortized over time).
Meals and entertainment with clients, prospects, or partners is 50% deductible. Keep records of who was present and the business purpose. Holiday parties for employees are 100% deductible if all employees are invited.
Your accountant's fees to prepare your business tax return, your lawyer's fees for business contracts, and consultants you hire for business purposes are all 100% deductible. Even this guide could lead you to professionals whose fees you can deduct!
Premiums for commercial general liability, errors and omissions, professional liability, business property insurance, and key person life insurance (where the business is the beneficiary) are deductible business expenses.
Bank service charges, merchant processing fees, e-transfer fees, and interest on business loans are all deductible. Credit card interest on business purchases is deductible; interest on personal credit cards is not (even if you used them for business — keep them separate).
Courses, certifications, books, conference registrations, and online learning directly related to your current business activities are deductible. Travel costs to attend conferences may also be deductible. The training must maintain or improve skills for your existing business — training for a new unrelated career is not deductible.
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