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GST/HST basics

Understand GST/HST terms, account numbers and everyday calculations.

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GST/HST basics

Updated October 16, 2026 ยท 2 min read

HST Number Example and GST Number Format in Canada

A GST/HST account is a 9-digit Business Number plus RT and a 4-digit reference number. See an illustrative format and how to verify a supplier in the CRA registry.

HST in Canada

Answers about GST/HST for self-employed Canadians. Information, not tax advice. Rates and rules checked against the CRA.

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