Swift Accounting & Business Solutions Ltd.
2440 Kensington Rd NW, Calgary, AB T2N 3S1
(403) 999-2295 · mailbox@swiftltd.ca
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CRA Tax Instalment Calculator (2026)
Work out instalments for personal tax, a corporation or GST/HST. Enter your net tax owing and see the three payment methods with due dates.
* A weekend due date moves to the next business day.
Estimate based on 2026 rules. Not tax advice.
How it's calculated
- Personal: instalments are required when net tax owing is over $3,000 this year and in either of the last two years ($1,800 in Quebec). CRA collects federal and provincial tax together, so enter one combined amount.
- Corporate: payments are monthly, or quarterly for qualifying CCPCs. The balance is due 2 months after year end, or 3 months for a CCPC claiming the small business deduction.
- Alberta and Quebec collect their own corporate tax, so each gets a separate schedule paid to Alberta TRA or Revenu Quebec.
- GST/HST: an annual filer pays four quarterly instalments when last year's net tax was $3,000 or more.
- The three methods are no-calculation (based on the two prior years), prior-year and current-year. The lowest total avoids instalment interest when paid on time.
Frequently asked questions
Who has to pay personal tax instalments?
You do if your net tax owing is over $3,000 this year and in either of the last two years. The limit is $1,800 for Quebec residents. It mostly affects the self-employed, landlords, investors and retirees with little tax withheld.
Do I pay Alberta personal tax instalments separately?
No. CRA collects Alberta personal income tax together with federal tax, so you make one payment to CRA. Only Quebec residents also pay a separate provincial instalment, to Revenu Quebec.
Can my corporation pay quarterly?
Yes, if it is a CCPC, has filed and paid on time for the last 12 months, and with associated corporations has taxable income of $500,000 or less and taxable capital of $10 million or less. Otherwise payments are monthly.
When are GST/HST instalments due?
An annual filer pays on the last day of the month after each fiscal quarter. For a December year end that is April 30, July 31, October 31 and January 31.
What interest applies if I pay late or pay too little?
CRA charges interest from each due date at the prescribed rate, which is 7% in 2026, compounded daily.
Talk to a Swift accountant
Not sure which method saves you interest? We can set up your instalments and check the amounts each quarter.