Canada Tax Installments

When the CRA stops waiting until April

Salaried employees rarely think about instalments because their employer withholds tax from every paycheque. But if you earn income with little or no tax withheld at source, rental income, self-employment, investment income, pension payments, the CRA does not want to wait for one big payment the following spring. It requires you to prepay your tax in four quarterly instalments during the year itself. The trigger is specific: you must pay by instalments if your net tax owing exceeds $3,000 in the current year and in either of the two preceding years. Below that threshold you are off the hook and can settle up at filing as usual. Quebec residents face a lower $1,800 threshold because the federal and provincial systems run separately there.

This tool answers the immediate question: am I required to pay instalments, and if so, how much per quarter using the simplest method. It takes your prior-year net tax owing and divides by four, which is the no-calculation prior-year option the CRA offers.

A $12,000 prior-year bill, quarterly

Suppose last year you owed $12,000 in net tax after withholding. That clears the $3,000 threshold, so instalments are required, and the prior-year method simply spreads it evenly.

Four payments of $3,000, due on the fifteenth of March, June, September, and December. Pay those on time and you have met your obligation regardless of how your actual income turns out this year. That predictability is the appeal of the prior-year method.

Three ways to figure the amount

The CRA gives you three options and lets you pick whichever suits you. The prior-year method, shown here, divides last year’s net tax by four and is safest because following it never attracts interest, even if you end up owing more. The no-calculation method is what the CRA prints on the instalment reminders it mails you, based on your two prior returns. The current-year method lets you estimate this year’s tax and pay a quarter of that, which is the right choice when your income has clearly dropped, say after retiring or losing a major client, so you are not overpaying based on a fat prior year. The trade-off is that if you lowball the current-year estimate and end up owing more, the CRA can charge instalment interest.

What missing one actually costs

There is no flat penalty for a missed instalment, but the CRA charges instalment interest at the prescribed rate plus 4 percentage points, compounded daily, on any shortfall from the date the payment was due. Because it compounds daily, falling behind early in the year is more expensive than it looks. There is a relief valve: you can reduce or eliminate the interest by overpaying or prepaying a later instalment, since the CRA awards contra-interest on early payments that offsets interest on late ones. If your interest charge climbs high enough, the CRA can also levy an additional instalment penalty, so it is worth catching up rather than letting a missed payment ride.

I am newly self-employed. Do I owe instalments in my first year?

Usually not. The requirement depends on net tax owing exceeding $3,000 in the current year and in one of the two prior years. If you were a salaried employee last year with tax fully withheld, you likely had little net tax owing then, so you fall outside the rule for your first self-employed year. The instalment obligation typically kicks in the following year, once your first big tax bill establishes the prior-year figure. Many new freelancers get the instalment reminder as a surprise in their second spring.

Can I just pay it all in one lump instead of quarterly?

You can pay the full year’s instalments early in a single payment, and doing so generates contra-interest in your favour, but you cannot simply wait and pay everything at filing without risking instalment interest. If cash flow is tight, paying as close to each due date as possible is fine; what the CRA penalizes is paying late relative to the schedule, not paying in a lump sum ahead of it.