Commission Pay in Quebec: Estimating Your Net Income

With commission pay, no two months look alike: a record month, a slow month, and the same question on every cheque — how much will actually be left once tax is taken out? The good news is that, to the tax authorities, a commission is ordinary employment income. The rules are the same as for a fixed salary; you just need to know where to look to estimate your net.

A commission is a salary in the eyes of tax

Whether you are paid entirely on commission or with a base salary plus commissions, all of that money is employment income. It is added to your income for the year and taxed at the same federal tax brackets and provincial brackets as any salary.

One useful point, because many people picture it backwards: tax is progressive. That means your income is sliced into brackets, and each bracket has its own rate. Your first few thousand dollars are taxed at the lowest rate, and only the dollars above a threshold move up to the higher rate. A large commission therefore never pushes your whole income into a higher bracket: it only touches the dollars at the top.

What gets taken off your commissions

Just as with an ordinary salary, on every commission cheque your employer must withhold at source income tax, QPP and EI — and in Quebec, QPIP is added on top. Here is what that looks like, for example, on a total of $70,000 earned over the year:

Four deductions, four different logics:

• Income tax (federal and Quebec): the biggest share, calculated from your brackets.
• QPP (Quebec Pension Plan): it funds your future retirement pension; it is a percentage of your pay, up to an annual ceiling.
• EI (Employment Insurance): it pays benefits if you lose your job.
• QPIP (Quebec Parental Insurance Plan): it covers maternity, paternity and parental leave.

These three contributions stop once their ceiling is reached: above it, only the tax keeps climbing.

Why a commission cheque can surprise you

On a fixed salary, the employer knows exactly how much to withhold: the same amount every cheque. On a commission, it is trickier. When the commission is paid separately or varies a lot, the employer uses a withholding method known as the "irregular payments" method: it calculates as if you earned that amount on every cheque of the year, which temporarily inflates the rate applied.

If you claim employment expenses (see below), you can give your employer Form TD1X, on which you estimate your own net commission income for the year. The employer then uses it to withhold an amount of tax closer to reality, instead of taking off too much.

The marginal rate: the true cost of one more commission

This is what disappoints salespeople most. When you land an extra commission, it is not added to your net at the average rate you pay on your whole income: it is taxed at your marginal rate, meaning the rate that hits the very last dollar earned.

At $70,000 of income in Quebec, that marginal rate sits around 36% once federal and provincial are combined. In concrete terms, on an extra commission of $1,000, you will keep about $640 net. It is not a penalty: that commission simply stacks at the top of your income, where the rate is highest. We spell out this mechanism in our article on marginal versus average tax rates.

Deducting your sales expenses

Here is an advantage specific to commission employees: you can sometimes deduct the expenses you incur to earn your commissions — travel, business meals, a home office. These expenses reduce your taxable income, and therefore your tax. To do so, the Canada Revenue Agency sets three conditions: your contract must require you to pay these costs yourself, you keep your receipts, and you keep a Form T2200 signed by your employer. One important limit: the total deducted cannot exceed your commissions for the year (apart from certain vehicle expenses).

In practice: set tax aside and estimate your net

Because withholding on commission rarely matches the exact amount, it is common to owe a balance of tax in April. If that balance climbs, the CRA can even ask you to pay your tax in advance, in four tax instalments: the threshold is $3,000 of net tax owing, lowered to $1,800 for Quebec residents, on March 15, June 15, September 15 and December 15.

The safeguard comes down to three habits:

1. Estimate your total annual income (base salary plus expected commissions) and enter it in the Salarium calculator to see your net, your monthly figure and your marginal rate.
2. Keep your receipts for sales expenses: they can bring your tax down.
3. Set aside a share of every commission — often 25 to 30% — in a separate account, to absorb any balance owing without pain.