One of the less-discussed obligations of self-employment in Canada is the quarterly tax instalment system. Unlike employees whose taxes are withheld from every paycheque, self-employed Canadians receive their full income without any tax deducted at source. The CRA addresses this through a system of quarterly instalment payments — essentially pre-paying your expected annual tax bill in four chunks throughout the year.
Missing instalments or paying the wrong amount triggers interest charges. This guide explains who must pay, when, how much, and how to do it efficiently.
You're required to make quarterly instalment payments if your net tax owing exceeds $3,000 (or $1,800 in Quebec) in the current year AND in either of the two previous years.
"Net tax owing" means your total federal and provincial income tax plus CPP contributions, minus any amounts withheld at source (e.g., from a part-time T4 job).
In plain terms: if you're a full-time freelancer earning meaningful income, you'll almost certainly be required to pay instalments after your first or second year.
Quarterly instalments are due four times per year:
These dates are fixed regardless of weekends or holidays (the CRA adjusts slightly if the date falls on a weekend). Mark them in your calendar at the start of every year.
The CRA allows three methods for calculating how much to pay each quarter. You can use whichever results in the lowest payments — as long as it avoids instalment interest.
The CRA sends instalment reminder notices in February and August suggesting amounts based on your prior year's tax return. If you pay exactly the amounts shown on these reminders, you will not be charged instalment interest — even if you end up owing more at filing time.
This is the safest and simplest approach for most freelancers. Pay what the CRA tells you, no calculation required.
Pay one-quarter of last year's net tax owing with each instalment. If you owed $8,000 last year, pay $2,000 per quarter this year. This protects you from interest as long as your income doesn't drop dramatically.
Estimate your current year's tax liability and pay one-quarter per instalment. This is the most accurate method if your income is significantly different from last year — higher (pay more to avoid a big April bill) or lower (pay less and preserve cash flow). However, if you underestimate and your final tax owing exceeds what you paid, interest applies on the shortfall.
Several payment methods are available:
When paying through online banking, use your SIN as the account number and select the correct tax year and instalment type.
Missing or underpaying an instalment triggers instalment interest charged at the CRA's prescribed rate (currently 9% annualized, compounded daily). Interest accrues from the due date until you pay.
If your instalment interest for the year exceeds $1,000, the CRA may also charge an instalment penalty — 50% of the interest charged minus the greater of $1,000 or 25% of the interest that would have been charged had you made no instalments at all. This penalty can add up quickly.
The CRA sends two instalment reminder letters each year:
These are sent to your registered address or available in My Account. Not receiving a reminder doesn't exempt you from the requirement — if you're required to pay, you must pay on time regardless.
The simplest approach: maintain a dedicated tax savings account and deposit 28–32% of every client payment into it immediately. By the time each instalment is due, the money is already set aside. Don't wait until March to start saving for March.
If you use online banking, you can automate a transfer to your tax savings account every time income arrives — making the process completely hands-off.
Instalment payments reduce — but rarely eliminate — your April 30 balance owing. You still file your T1 return and pay any remaining balance by April 30. If you've overpaid through instalments, you receive a refund. The goal is to have instalments cover roughly your full tax liability so the April balance is minimal.
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