Business, HST and payroll

What is the Business number (BN)?

The nine-digit number CRA uses to identify your business. Program accounts hang off it, like RT0001 for HST and RP0001 for payroll.

Good to know

One business, one number, even with several accounts.

Also called: BN, CRA business number.

Reviewed by the Done Right Accounting team. Last reviewed October 2026.