GST/HST Filing Frequency Explained: Monthly, Quarterly or Annual?

How the CRA assigns GST/HST reporting periods, when each return and payment is due, and how to keep every client’s schedule straight.
CRA Late-Filing Penalties: What a Missed Deadline Really Costs Your Clients

How CRA late-filing penalties and interest work for T1, T2, GST/HST, instalments and payroll, with simple examples to share with clients.
2027 CRA Tax Deadlines Calendar for Accountants (2026 Tax Year)

Every key CRA deadline for the 2026 tax year in one place: RRSP, T4 and T5 slips, T1, self-employed, T2, GST/HST, payroll and instalments.