GST/HST Filing Frequency

Definition

Every GST/HST registrant is assigned a reporting period by CRA under ETA s.245 based on its "threshold amount" for the fiscal year, which is essentially prior-year taxable supplies. The three periods are annual, quarterly, and monthly. Registrants may elect a more frequent period than the default, but cannot elect a less frequent one. Filing deadlines and any installment obligations flow from the assigned period.

Key rules

• Assigned reporting periods (ETA s.248):

• Filing deadlines under ETA s.238:
  • Annual filer (non-individual, not a December 31 year-end): return and balance due three months after the fiscal year end.
  • Annual filer who is an individual with a December 31 year-end: return due June 15, balance due April 30.
  • Quarterly and monthly filers: return and balance due one month after the end of the reporting period.
• Installments: an annual filer whose net tax for the previous year (or estimated for the current year) is $3,000 or more must pay quarterly installments under ETA s.237 by the last day of the month following each fiscal quarter. Each installment is 25% of the lesser of prior-year net tax and estimated current-year net tax.
• Election to file more often (Form GST20) is useful for registrants in a refund position, because faster filing means faster refunds.
• Late filing: penalties under ETA s.280.1 apply, plus interest on unpaid net tax.

Example

A BC corporation with a December 31 year end has $800,000 of taxable revenue in 2025. It is assigned the default annual reporting period for 2026. In 2025 its net GST owing was $12,000.

2026 obligations
Reporting period:  Jan 1, 2026 to Dec 31, 2026
Return due:        March 31, 2027 (3 months after year-end)
Balance due:       March 31, 2027

Installment obligation (ETA s.237)
Prior-year net tax: $12,000 (exceeds $3,000 threshold)
Quarterly installment: $12,000 / 4 = $3,000

Installment due dates
Q1 installment: April 30, 2026
Q2 installment: July 31, 2026
Q3 installment: October 31, 2026
Q4 installment: January 31, 2027
Final reconciliation and top-up with return filed March 31, 2027.

If 2026 turns out to be a refund year the installments are returned with the reconciliation. If 2026 tax exceeds the installment total, the shortfall is paid by March 31, 2027.

Common mistakes

• Confusing the return filing deadline with the balance-due date for an individual annual filer. The return is due June 15, but balance is due April 30.
• Skipping installments because the business "always gets a refund". The requirement is based on prior-year net tax, regardless of cash flow expectations.
• Missing a quarterly installment and incurring installment interest even though the annual balance is small.
• Electing a shorter reporting period and then not filing on the tighter schedule. Monthly missed returns compound penalties quickly.
• Forgetting that the $1.5M and $6M thresholds are based on taxable supplies of the registrant and its associates, not net tax.

Related concepts

Filing frequency is set at registration. The return nets GST collected against ITCs. Review the overview for how remittance flows to participating provinces.