The Truth About Write-Offs: What You Can and Can’t Claim

When it comes to business expenses, the line between what you can write-off and what you can’t isn’t always clear.

For sole proprietors, small business owners, and entrepreneurs, understanding what qualifies as a legitimate tax deduction under Canadian law is essential—not just for maximizing your return, but for staying compliant with CRA regulations.

Here’s a clear breakdown of what you need to know when it comes to business write-offs in Canada.

Who’s Eligible to Claim Expenses?

To claim business expenses, you must be operating a legitimate business—not just a hobby. The Canada Revenue Agency (CRA) requires that your activity has a reasonable expectation of profit. If you’re not earning income or at least working toward generating it, your deductions may be denied during a review or audit.

Understanding the Two Types of Expenses

Current Expenses (Operating Costs)

These are day-to-day costs to keep your business running and are fully deductible in the year incurred. Examples include:

• Office supplies (paper, pens, printer ink)
• Legal and accounting fees
• Utilities and internet (business-use portion)
• Vehicle costs (gas, insurance, maintenance – only the business-use portion)
• Advertising and promotion
• Business insurance premiums

Capital Expenses (Long-Term Assets)

These are larger purchases with a lasting benefit and must be deducted over time using the Capital Cost Allowance (CCA). Examples include:

• Computers, furniture, or equipment
• Vehicles used for business
• Leasehold improvements
• Specialized tools or machinery

Each asset falls into a CRA-defined class with a specific depreciation rate. For instance, computer equipment often falls into Class 50 and may be deducted at a rate of 55% per year on a declining balance basis.

Prepaid Expenses: What to Watch Out For

Prepaid expenses are costs you pay upfront for goods or services to be used in the future—like insurance, subscriptions, or rent. These must be allocated appropriately based on your accounting method (cash vs. accrual).

For example, if you pay for a 12-month insurance policy in July, only half the expense is deductible in the current tax year if you’re using accrual accounting.

Maintain Proper Records

The CRA requires you to keep detailed records of all your business expenses for at least six years. This includes:

• Receipts and invoices for all expenses
• Bank and credit card statements
• Mileage logs for vehicle-related claims
• Documentation showing how much of your home or vehicle is used for business
• Details of capital assets purchased, including date and cost

Without proper documentation, the CRA can deny your deduction—even if the expense was legitimate.

Common Misconceptions: What You Can’t Claim

Not everything you spend money on qualifies as a business expense. Here are some items that are frequently misunderstood:

Personal expenses: Only the business portion of shared costs (like cell phone bills or home internet) can be deducted.

Mortgage principal payments: You can deduct mortgage interest for a home office, but not the principal.

Capital expenses (immediate full deduction): You can’t deduct the entire cost of a long-term asset in the year of purchase—you must use CCA.

Home renovations: Unless specifically for your business space, they’re generally not deductible.

Entertainment: Meals and entertainment are only 50% deductible and must be directly related to earning income.

Best Practices for Claiming Write-Offs

• Classify each expense correctly as either current or capital.
• Track all business usage separately, especially for vehicles, phones, and home offices.
• Keep digital or physical copies of every receipt.
• Use CRA’s CCA rules to determine how much of each asset can be deducted annually.
• Calculate home office claims based on square footage and exclusive use for business purposes.

Write-offs are a powerful way to reduce your tax burden, but only when used properly.

Understanding the difference between allowable current expenses and capital expenditures—and documenting your spending—will help you maximize deductions while staying compliant with CRA rules.

At RHN, we help small business owners and self-employed professionals confidently navigate their finances. If you’re unsure about what you can and can’t claim, or you want to ensure your books are audit-ready, we’re here to help.

Book a consultation with RHN today and make your deductions work smarter for you.

 

This post has been prepared for general information purposes. It is not advice. The information presented may not fit your unique situation. Please consult one of our trusted business advisors at RHN CPA for further clarification and interpretation of your circumstances.