5 Tax Deductions Small Business Owners Miss Every Year

Every year, small business owners overpay on taxes simply because deductions get missed in the shuffle of running a business. None of this is a substitute for a review of your specific return — but here are five areas worth a second look.

1. Home office expenses

If you run part of your business from home, a portion of rent or mortgage interest, utilities, and property tax may be deductible based on the percentage of your home used for business.

2. Vehicle expenses

Mileage, fuel, insurance, and maintenance for business use of a vehicle are commonly under-claimed, usually because owners don't keep a mileage log through the year.

3. Professional development

Courses, certifications, and industry conferences that maintain or improve skills used in your business are often deductible, even when they don't directly generate new revenue.

4. Capital cost allowance

Equipment, furniture, and technology purchases depreciate over time under CRA's capital cost allowance rules — and the timing of when you claim it can meaningfully affect your tax bill.

5. Salary vs. dividend timing

For incorporated businesses, the mix and timing of salary versus dividends can shift your total tax bill more than any single deduction on this list.

The bigger picture

Deductions matter, but they're most valuable as part of a coordinated plan — one that looks at your corporate structure, your personal return, and your long-term goals together, rather than one return in isolation each spring.