GST/HST bookkeeping for small businesses

Short answer: Keep GST/HST on sales, eligible input tax credits, adjustments and payments traceable to your records for each reporting period. Reconcile the tax accounts before preparing a return, then confirm filing and payment separately. Not every tax amount on a purchase is claimable, and a balanced ledger alone does not establish the correct tax treatment.

This article explains general bookkeeping practice. For rules specific to your situation, always confirm with the CRA. Sales-tax rules and rates change, so verify current details on Canada.ca.

Do you need to charge GST/HST?

You generally must register if you are no longer a small supplier and make taxable supplies in Canada. For most businesses, the $30,000 test considers worldwide taxable supplies, including those of associates, subject to the CRA’s calculation rules. The charging start date depends on how the threshold is exceeded:

• Over $30,000 in one calendar quarter: you stop being a small supplier on the supply that takes you over, and must charge GST/HST on that supply.
• Over $30,000 over consecutive calendar quarters, but not in one quarter: you stop being a small supplier at the end of the month following the quarter in which you exceed the threshold. Your registration takes effect no later than your first supply after that, and charging begins on the effective date.

Exceptions and different tests apply, including for taxi/ride-share businesses, charities and public institutions. Confirm the calculation, effective date and registration deadline using the CRA’s When to register for and start charging the GST/HST.

What GST/HST bookkeeping actually tracks

Two sides, kept current all period long:

• GST/HST collected — the tax you charge customers on taxable sales.
• Potential input tax credits (ITCs) — eligible GST/HST paid or payable on purchases used in commercial activities, subject to the applicable rules, timing and supporting documents. The CRA’s ITC guidance explains the conditions.

Under the regular method, tax collected or collectible, eligible ITCs and applicable adjustments contribute to the net-tax calculation. Do not simply subtract all tax on purchases from tax on sales. Special methods and situations can change the calculation; confirm which applies with your accountant. See the CRA’s guide for GST/HST registrants.

The rate depends on the province

The type of supply and applicable place-of-supply rules determine whether and at what rate GST/HST is charged. A customer’s province alone is not a complete rule for every transaction. Keep the delivery, service or other location information needed to support the treatment, and check the CRA’s charging and collecting guidance. Separate PST, QST or RST obligations need their own review where applicable.

Your reporting period is not a cash-flow choice each month

Check the reporting period and due dates in your CRA account. The CRA assigns a reporting period; eligible elections may allow a different period, but you should not change your schedule informally. Use the GST/HST registrants’ guide to check the available elections.

Keep a separate filing date and payment date in your task list. Monthly and quarterly returns are generally due one month after the reporting period; annual rules and exceptions differ. For example, certain individual annual filers with a December 31 year-end have an April 30 payment deadline and June 15 filing deadline. Confirm your own dates against the CRA’s reporting requirements.

Records to keep

• Sales invoices showing the GST/HST charged
• Receipts and invoices for expenses, showing the GST/HST paid (needed to support your ITCs)
• Your GST/HST number on invoices once registered
• A running total of tax collected and paid, reconciled to your books

The CRA expects you to keep supporting records — generally for six years. See how long to keep business records.

Common GST/HST mistakes

• Not registering on time after crossing the $30,000 threshold.
• Applying a tax code without checking the supply and place-of-supply rules.
• Missing input tax credits because expense receipts weren’t kept — leaving money on the table.
• Claiming ITCs without proper documentation to support them.
• Not reconciling GST/HST to the books, so the return doesn’t match what was actually collected and paid.
• Mixing personal and business purchases, which muddies which tax is claimable.
• Using the wrong reporting period or assuming filing and payment always share a deadline.

How to make filing painless

Prepare a period summary showing sales tax, potentially eligible ITCs, adjustments, the opening liability and payments already made. Link the totals to ledger detail and retain the records behind unusual transactions. Keep a separate review list for missing invoices, mixed personal/business purchases and uncertain tax codes.

Once the return is approved and filed, retain its confirmation and reconcile the payment or refund to the tax account. A prepared worksheet, a filed return and a cleared payment are three different completion checks. This fits the owner-and-frequency workflow in our bookkeeping checklist.

Where Avora fits

Avora can organise supporting records, reconcile the GST/HST accounts and prepare a review package within an agreed scope. Confirm who reviews tax treatment, approves the return, files it and makes the payment. See our GST/HST support service, or discuss your records.

Avora provides bookkeeping support, not tax or legal advice. For advice specific to your situation, consult your accountant or the CRA.

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Reviewed October 16, 2026 against the linked CRA guidance. Confirm the method, eligibility, place-of-supply treatment and deadlines for your circumstances.