A CRA business number is easy to treat as a registration detail and forget about. In practice, it controls how your business reports GST/HST, remits payroll deductions, and files corporate income tax. This guide to CRA business numbers explains what to register, when to register it, and how to keep each account aligned with your bookkeeping.
What a CRA business number does
A business number, often called a BN, is a nine-digit identifier assigned by the Canada Revenue Agency. It identifies the legal business to the CRA. The number itself does not automatically mean you are registered for every tax program.
Program accounts are added to the BN based on your business activities. Each program account uses a two-letter code and a four-digit reference number. For example, a GST/HST account may appear as RT0001, while a payroll account may appear as RP0001.
For most Alberta small businesses, the relevant program accounts are GST/HST, payroll deductions, and corporate income tax. A corporation will generally have a corporate income tax account as part of its CRA setup. A sole proprietor may only need a BN when registering for GST/HST or payroll, unless another federal program applies.
Your BN is not the same as your Alberta corporate registry number, trade name registration, or personal Social Insurance Number. Keeping those identifiers separate prevents avoidable filing errors, especially when a bookkeeper, accountant, or payroll provider needs access to the right records.
Guide to CRA business numbers: choose only the accounts you need
Opening accounts you do not use creates more compliance work, not more flexibility. Each active CRA program account can come with filing obligations, due dates, and potential penalties for missed returns. Register based on what your business does now and what is reasonably expected in the near term.
GST/HST account
Most businesses must register for GST/HST once taxable revenues exceed $30,000 in a single calendar quarter or across four consecutive calendar quarters. Taxable revenue includes sales of most goods and services before GST, not your profit after expenses.
Some businesses register voluntarily before reaching the threshold. This can make sense when you buy equipment, materials, software, or subcontractor services with GST and want to claim input tax credits. The trade-off is that you must charge GST on taxable sales and file returns on time, even during slow periods.
Alberta does not have a provincial sales tax, but GST still applies to many sales made in the province. Businesses selling across Canada may need to consider whether HST applies to customers in participating provinces. The correct treatment depends on what you sell and where the supply is considered to occur.
Your GST/HST account is usually listed as RT0001. Once registered, record GST collected and GST paid separately in QuickBooks Online. Combining tax with income or expenses may make a bank balance look reasonable while producing an incorrect GST return.
Payroll deductions account
Register a payroll program account before paying salaries, wages, bonuses, or other employment income. The account is normally shown as RP0001. It allows you to remit income tax, CPP contributions, and EI premiums, then issue T4 slips at year-end.
Do not assume that calling someone a contractor removes payroll responsibilities. Worker classification depends on the actual relationship, including control over the work, tools, financial risk, and opportunity for profit. If the arrangement looks like employment, obtain professional advice before processing payments as contractor expenses.
Payroll creates a regular cash commitment. The amount withheld from employee pay is not operating cash available for materials, rent, or owner draws. A practical cash forecast should show upcoming payroll remittances alongside supplier payments and GST installments so the funds remain available when due.
Corporate income tax account
If your business is incorporated, it generally has a corporate income tax program account, commonly identified with RC0001. This account is used for the corporation's T2 income tax return and related CRA correspondence.
A corporate tax account does not replace the need for organized monthly records. Your year-end accountant can prepare a T2 return more efficiently when transactions are reconciled, expenses are categorized consistently, shareholder activity is clearly documented, and sales tax balances agree with filed returns.
Sole proprietors typically report business income on their personal income tax return rather than filing a T2. That distinction matters when you are reviewing CRA notices or setting up access. An incorporated company and its owner are separate taxpayers, even if the owner is the only person working in the business.
Registering and confirming your account details
You can register a business number and program accounts through CRA registration channels. Before starting, confirm the legal name of the business, business structure, physical and mailing addresses, business activity, anticipated revenue, and the effective date of registration.
For a GST/HST registration, the effective date matters. It determines when you begin charging tax and when you may begin claiming eligible input tax credits. For payroll, the effective date should match the date you first pay employees, not the date you decide you may hire later in the year.
After registration, retain the confirmation details and verify the reporting frequency assigned to each account. GST/HST filers may be annual, quarterly, or monthly depending on revenue and elections. Payroll remitters may have different remittance schedules based on their remittance history and average monthly withholding amount.
Use the full program account number on returns, payments, and CRA correspondence. The nine-digit BN alone is not always enough. A payment sent to the wrong account can still require follow-up, even when it was paid under the correct legal business name.
Build your bookkeeping around CRA deadlines
CRA registrations work best when they are reflected in your regular bookkeeping process. Waiting until a filing deadline to identify GST, payroll, or corporate tax activity often leads to rushed coding decisions and incomplete records.
Start by connecting each business bank account and credit card to your bookkeeping system. Reconcile them monthly against statements, not just against the feed balance. Reconciliation catches duplicate entries, missing expenses, unrecorded deposits, and payments that may have been posted to the wrong tax category.
Then review sales tax balances before each GST/HST filing. GST collected should be supported by sales records, and input tax credits should be supported by valid business expenses. Personal purchases, shareholder withdrawals, meals with limited tax recovery, and exempt expenses require careful treatment. The answer is not always to claim the GST shown on a receipt.
For payroll, reconcile payroll reports to bank payments and the payroll liability account each month. The balance should tell you what is owed for recent payroll activity. If it grows unexpectedly or turns negative, investigate before the next remittance date.
Monthly profit-and-loss statements also provide a useful compliance check. If revenue is increasing toward the GST registration threshold, you can prepare before the deadline rather than retroactively correcting invoices. If payroll costs rise quickly, your forecast can account for larger remittances and vacation pay obligations.
Common business number mistakes that create extra work
The most common problem is registering an account and then overlooking its return requirements. A nil return may still be required when there was no activity. Ignoring CRA mail because the business had no sales can result in late filing penalties or account follow-up.
Another issue is using a personal bank account for business activity after obtaining a BN. The CRA business number does not create clean records by itself. Separate banking gives you a clearer audit trail, reduces time spent sorting owner transactions, and produces more reliable financial statements.
Business owners also sometimes continue using an old BN after a structural change. Incorporation is a common example. A new corporation is generally a new legal entity and needs its own CRA registration and records. The sole proprietorship's GST history, bank activity, and invoices should not simply be carried forward without considering the transition date and tax treatment.
Finally, make sure authorized representatives have the access they need, but no more. Your bookkeeper may need information to prepare records and returns, while your accountant may need access for tax filings. Review authorizations when staff, providers, or business ownership changes.
A CRA business number is most useful when it becomes part of a disciplined financial process. Keep the registrations current, reconcile the accounts every month, and use your reports to plan for the cash obligations that come with growth. That approach gives you more than compliance - it gives you numbers you can use to run the business with confidence.