Self-Employed Deductible Expenses in Quebec

When you work for yourself, every business expense you deduct lowers the tax you owe. But by how much? Plenty of self-employed people assume a $1,000 invoice saves them $1,000 in tax. The gap with reality is wide. Here is what your car, your cellphone and your home office are really worth, and the rules the Canada Revenue Agency applies to each one.

A deduction does not give you the amount back: it gives you your marginal rate

First thing to understand, because everything else follows from it: a deduction and a tax credit are not the same thing.

A credit is subtracted from the tax you owe. A deduction is subtracted from your income before the tax is calculated. So you never get the expense itself back: you get back the tax you would have paid on that slice of income.

How much? Your marginal rate. The marginal rate is the percentage of tax that applies to the next dollar you earn — or, the other way round, to the last dollar you take away. It is not the average rate you pay on your whole income: it is the rate on your top slice, and it is always higher.

In Quebec, that marginal rate adds up two taxes. The federal brackets run from 14% on the first $58,523 of taxable income to 33% above $258,482. On top of that come the Quebec brackets, which the federal page does not give: it sends Quebec residents to Revenu Québec for their provincial rates. And one feature pulls the other way: the calculation then applies the 16.5% Quebec abatement, which reduces federal tax for residents of the province by that much.

Put end to end, here is what a deductible expense actually returns.

These are the rates Salarium's calculation engine applies for Quebec, rounded to the percentage point. They climb in steps: crossing a step changes what each deducted dollar is worth.

The basic rule: reasonable, and incurred to earn income

The CRA sums it all up in one sentence: "as a rule, you can deduct any reasonable current expense you incur to earn income".

Two words carry the weight in that sentence.

Current. A current expense is used up within the year: gas, paper, a software subscription. Buying something durable — a computer, a vehicle — does not follow that path. The CRA makes it a separate category in its list, capital cost allowance, which spreads the deduction over several years instead of giving it all in the first one.

Reasonable. There is no table setting out where the limit sits. An expense out of all proportion to the income it helps earn simply risks being denied.

To that add a third rule, which applies to almost everything below: only the business part counts. The CRA is explicit — "enter only the business part of expenses on Form T2125". If your car is used 40% for work, you deduct 40% of its costs, not the car.

The car: prorated, line item by line item

The deductible vehicle costs are listed by the CRA: licence and registration fees, fuel and oil, electricity for a zero-emission vehicle, insurance premiums, maintenance and repairs, leasing costs, and the interest on money borrowed to buy the vehicle.

Buying the vehicle itself is not on that list. It goes through capital cost allowance, which the same page sends to line 9936 of the return.

The prorating is the sensitive part here. You do not deduct "your car": you deduct, line item by line item, the percentage matching your business use. And you have to be able to back that percentage up.

A worked example

You drive 20,000 km in the year, 8,000 of them for work. Your business share is therefore 40%. If gas, insurance, maintenance and registration add up to $6,000, you deduct $2,400. At a 36% marginal rate, that deduction is worth about $864 less tax.

Cellphone, home phone and utilities

Same prorating logic, with two rules the CRA states in black and white.

For a cellphone, you can deduct "the percentage of airtime expenses for a cellphone you use to earn your business income". If half your use is professional, you deduct half.

For a home telephone, the rule is blunter: "do not deduct the basic monthly rate of your home telephone". The household's basic plan stays a personal expense, even if you take business calls on it. If you have a separate line used only for business calls, on the other hand, its basic monthly rate is deductible.

On utilities — gas, oil, water, electricity, cable — there is a trap. If they relate to a workspace in your home, they are not deducted in this category: the CRA sends you instead to business-use-of-home expenses, which follow their own rules. That is the next section.

The home office: two conditions, a ceiling, a trap

This is the most claimed and the most misunderstood deduction of them all.

The conditions. You have to meet one of two, not both: either the space is your principal place of business, or you use it only to earn your business income and, on a regular and ongoing basis, to meet clients, customers or patients there. The first one settles the case for most self-employed workers.

What goes in. Part of your maintenance costs — heating, electricity, cleaning materials — plus part of your home insurance, your property taxes, your mortgage interest, and capital cost allowance.

Working out the share. The reasonable basis the CRA suggests is the area of the workspace divided by the total area of the home. If the room is also used for something else, you instead divide the number of hours a day devoted to the business by 24, then apply that result to the costs. And if you run the business only part of the week or the year, the claim is reduced accordingly.

The ceiling. The deduction cannot be more than "your net income from the business before you deduct these expenses". In other words: it can bring your business income down to zero, never below. It does not create a loss.

The trap. This one is expensive and only surfaces years later. If you deduct capital cost allowance on the business-use part of your home and later sell it, "the capital gain and recapture rules will apply". That is why that particular piece of the deduction deserves some thought before you claim it: the rest of the home expenses raise no such problem.

These costs are reported on line 9945 of the return.

Meals and entertainment: half of it

A simple rule, often missed: the maximum you can claim for food, beverages and entertainment is 50%, and that 50% applies to the lesser of two amounts: what you actually spent, or an amount that is reasonable in the circumstances.

A $120 business lunch therefore gives you a $60 deduction, not $120. At a 36% marginal rate, the real tax saving is about $22. Still a gain, but not the one many people picture.

What about the Quebec side?

Everything above comes from the Canada Revenue Agency and applies to your federal return. In Quebec, you file a second one. The federal rates page says so itself: Quebec's rates are published by Revenu Québec, not by the CRA.

Quebec's rules on business expenses broadly follow the same logic, but they have their own forms and their own lines. For the provincial side, go to Revenu Québec: this article only repeats what the CRA states on its own pages.

One point is worth adding, and it works in your favour. The expenses you deduct lower your net business income — which is also the base used to calculate your Quebec Pension Plan contributions. And a self-employed worker pays both halves of that contribution, the employee's and the employer's. So a deductible expense is worth slightly more than the marginal tax rate alone.

And if your revenue is climbing, the other article to read is the one on the $30,000 threshold that triggers sales tax registration.

Before you deduct anything: three habits

• Separate your accounts. A bank account and a card kept for the business make the business share obvious, instead of leaving you to reconstruct it from memory in the spring.
• Record the percentage, not just the amount. For the car, the cellphone and the home, what gets questioned is the prorating, not the invoice.
• Keep your supporting documents. An expense with no paperwork behind it is an expense that is hard to defend.

That leaves the question that decides everything: your marginal rate. It is what turns an expense into a tax saving, and it depends only on your income level. The Quebec net salary calculator shows it for a given income.