Business Expenses in Canada: What the CRA Lets You Deduct

By OptiVal Editorial Desk

Business expenses in Canada follow one simple-sounding rule from the CRA: you can deduct any reasonable current expense you paid or will have to pay to earn business income. Simple to say, and easy to get wrong. Most reassessments we see do not come from owners hiding income. They come from expenses claimed with no clear business purpose, no receipt to back them up, or a full claim on something that was only partly for business.

This guide walks through the one test every claim has to pass, the expenses that usually qualify, the ones the CRA will refuse, and the bookkeeping habits that keep your deductions safe if you are ever asked to prove them.

The one test every business expense in Canada has to pass

Section 18 of the Income Tax Act is the gatekeeper: no deduction except for an outlay made for the purpose of gaining or producing income from the business. In plain language, the CRA asks two questions about every dollar you claim:

1. Was it reasonable? Would a sensible business owner pay that amount in your situation?
2. Was it incurred to earn business income? Does it connect to the income-earning process, not to your personal life?

If either answer is no, the deduction fails. And when an expense serves both purposes, only the business portion counts. If the family car is used for client meetings 40 percent of the time, your claim is 40 percent, not 100. “Incurred” simply means you paid it or you will have to pay it, so you do not need to wait for the cash to leave your account.

The CRA’s full rules on this live in Guide T4002, Chapter 3 on business expenses.

Common deductible business expenses in Canada

Most small businesses land in the same buckets. Here is what typically qualifies, and the fine print that trips people up:

• Advertising and promotion: Google ads, flyers, a website refresh. If it markets the business, it is deductible.
• Office supplies and software: printer paper, printer ink, and your cloud accounting subscription. Subscriptions count as long as they serve the business.
• Rent: office, shop, or warehouse rent is fully deductible.
• Insurance: business liability and commercial property premiums qualify. Life insurance on the owner does not.
• Professional fees: your accountant, your lawyer, your business consultant. Yes, our own fees are deductible too.
• Bank charges and interest on business borrowing: account fees and interest on a business loan or line of credit. Interest and penalties charged on your income tax bill are specifically not deductible.
• Business travel: flights, hotels, and taxis for business trips. Commuting from home to your regular workplace is personal, not business.
• Vehicle expenses: fuel, maintenance, insurance, and capital cost allowance on the vehicle, limited to the business-use percentage and supported by a logbook.
• Home office: the business-use portion of rent, utilities, and maintenance for the space you work in.
• Meals and entertainment: generally limited to 50 percent of the cost, with the business purpose documented. A dinner with no note about who attended and why is a denied claim waiting to happen.
• Phone and internet: the business-use portion of your plan.
• Wages paid to employees: fully deductible. Wages or drawings you pay to yourself are not an expense of the business at all.
• Subcontractors: fees paid to contractors who do work for the business.

If an expense is not on this list, go back to the two-question test. The list is illustrative, not exhaustive: the rule matters more than the label.

Expenses the CRA will not let you deduct

Some items are denied no matter how carefully you document them. The main ones from the CRA’s own guidance:

• Salary, wages, or drawings paid to yourself or your partners. That is a personal draw, not a business expense.
• Personal and family living costs: groceries, home maintenance for your residence, clothing (unless it is protective gear required for the work).
• Donations and political contributions. Charitable donations generate a tax credit on a separate schedule, not a business deduction.
• Interest and penalties on income tax owing. Being late costs you twice.
• Fines and penalties, including parking tickets picked up on a business trip.
• Life insurance premiums where the owner is the insured.
• The personal portion of any mixed-use expense. Only the business part survives.

Current expense or capital expense: do not expense your laptop

Here is the mistake that costs owners the most. A $2,400 laptop is not a $2,400 deduction this year. It is capital property: something that gives you lasting benefit beyond the year. Capital property is claimed gradually through capital cost allowance (CCA), year by year, not written off in one shot.

The same treatment applies to office furniture, machinery, and vehicles. The quick rule of thumb: if it will still be working for you next year, it is probably capital. Supplies that get used up, like paper and ink, are current expenses and deductible right away. Getting this line wrong is one of the fastest ways to trigger an adjustment, because the dollar amounts are large and easy for a reviewer to spot.

The 4 mistakes that get business expenses denied

1. Mixing personal and business spending. One bank account for everything forces you to reconstruct the business portion later, and reconstructions rarely survive scrutiny. A separate business account is the cheapest audit insurance there is.
2. No receipts. The CRA expects every claim to be supported. A bank statement proves you paid someone; a receipt proves what you bought and that it was for the business. Photograph receipts the day you get them.
3. Writing off capital purchases in full. As above, big-ticket items go through CCA. Claiming the whole cost at once is an automatic adjustment if it is reviewed.
4. Claiming 100 percent of a mixed-use expense. The car, the phone, the home internet. Pick a reasonable business-use percentage, document how you got it, and claim only that.

How to keep your business expenses CRA-ready

You do not need a complicated system. You need three habits: a dedicated business account so personal spending never mixes in, a receipt captured for every purchase, and a simple log for anything split between business and personal use. Review it monthly, not once at tax time when the details are gone.

That monthly review is exactly what a good bookkeeper does. If your expense tracking is currently a shoebox of crumpled receipts, our bookkeeping services start at $199 a month (CAD, HST extra), and we clean up messy books at $45 an hour. See the full rate card here.

Not sure whether your expenses would survive a CRA review? Book a free consultation and we will look at your books together, no obligation. Clean records now are far cheaper than a reassessment later.