When Is GST Due in Canada? Filing Dates

A GST/HST deadline can arrive before a business owner has finished reconciling the prior month’s bank activity. Missing it can mean interest, penalties, and a preventable cash-flow problem. If you are asking when is GST due Canada, the answer depends on your GST/HST reporting period, fiscal year-end, and whether you are an individual registrant with a December 31 year-end.

For most registrants, the rule is straightforward: your GST/HST return and any net tax payment are due one month after the end of the reporting period. Annual filers have important exceptions, particularly sole proprietors and certain partnerships.

When Is GST Due in Canada by Reporting Period?

Your GST/HST reporting period is assigned by the Canada Revenue Agency, although some businesses can elect to file more frequently. Check the reporting period printed in your CRA business account or GST/HST return rather than assuming it matches your income tax filing cycle.

Monthly GST/HST filers

Monthly registrants must file their GST/HST return and pay any amount owing one month after the end of the reporting period.

For example, a return for the reporting period ending January 31 is generally due February 28 or 29. A return for the period ending June 30 is generally due July 31.

Monthly filing is common for larger businesses and can also be elected by businesses that want to recover input tax credits more quickly. The trade-off is administrative: bookkeeping must be current every month, with sales tax coded correctly and receipts retained for eligible expenses.

Quarterly GST/HST filers

Quarterly registrants also file and pay one month after the end of each quarter. If your quarter ends March 31, the return and payment are generally due April 30. A quarter ending September 30 is generally due October 31.

Many growing businesses prefer quarterly reporting because it reduces filing volume while avoiding the larger GST/HST balances that can build up under annual reporting. It can be a practical fit for contractors, professional practices, real estate businesses, and incorporated businesses with consistent bookkeeping.

Annual GST/HST filers

Most annual registrants must file their GST/HST return and pay the net tax owing three months after the end of their fiscal year. For a corporation with a December 31 year-end, that generally means a March 31 filing and payment deadline.

However, annual reporting does not mean a business can ignore GST/HST until year-end. If annual net tax is above the CRA threshold, GST/HST installments may be required during the year. Installments are generally due one month after the end of the first, second, and third fiscal quarters. Businesses that underpay installments may face interest even if the annual GST/HST return is filed on time.

The December 31 Exception for Individuals

The most commonly missed GST/HST deadline involves individuals with a December 31 fiscal year-end. This category can include sole proprietors, self-employed consultants, and certain partnerships where all partners are individuals.

If you are an annual GST/HST filer and are an individual with a December 31 year-end, your GST/HST return is due June 15. But any GST/HST amount owing is generally due April 30.

That split deadline matters. Filing by June 15 does not stop interest from accruing after April 30 on an unpaid GST/HST balance. A sole proprietor who waits until their personal income tax return is ready in June may file the GST/HST return on time but still incur interest if no payment was made by April 30.

A practical approach is to estimate the GST/HST payable as soon as year-end bookkeeping is complete, pay by April 30, and then finalize the return before June 15. If the final amount differs, the balance can be adjusted when the return is filed.

How Your GST/HST Filing Frequency Is Set

The CRA generally determines a registrant’s reporting frequency from annual taxable supplies, including zero-rated supplies. The standard thresholds are:

• Annual reporting is generally assigned when taxable supplies do not exceed $1.5 million.
• Quarterly reporting is generally assigned when taxable supplies exceed $1.5 million but do not exceed $6 million.
• Monthly reporting is generally assigned when taxable supplies exceed $6 million.
• Businesses may often elect a more frequent reporting period, subject to CRA rules.

A business with lower revenue may choose monthly reporting to claim input tax credits sooner, especially if it has substantial startup costs, equipment purchases, or ongoing subcontractor expenses. On the other hand, an annual filer must plan carefully because GST/HST collected from customers is not operating income. It should be tracked separately and reserved for the eventual remittance.

Filing Late or Paying Late: What Happens?

A GST/HST return must be filed even when there is no tax owing and no business activity for the period. This is commonly called a nil return. Failing to file a nil return can trigger CRA follow-up and may lead to an estimated assessment.

When a return is late and an amount is owing, the CRA may assess a late-filing penalty. Interest can also accrue on unpaid balances and, where applicable, on missed or insufficient installment payments. The cost can increase quickly when a business has several unfiled periods.

Late filing also creates operational problems beyond penalties. A lender, buyer, investor, or government program may request current tax compliance information. Unfiled GST/HST returns can delay financing, corporate transactions, and efforts to bring bookkeeping up to date.

If a business cannot pay the full balance by the deadline, filing the return on time is still generally the better choice. It establishes the actual amount owing and may reduce late-filing exposure. Payment arrangements may be available in appropriate situations, but they do not automatically eliminate interest.

Deadline Rules That Can Change the Actual Date

If a GST/HST due date falls on a Saturday, Sunday, or public holiday recognized by the CRA, the return and payment are generally considered on time if received on the next business day. Do not rely on this rule as a reason to wait until the last minute. Electronic payments can have processing times, and a payment initiated on the due date may not always be treated as received that day.

The reporting period end date also controls the deadline. A business with a non-calendar fiscal year should calculate its due date from that actual year-end, not from December 31. This is particularly relevant for corporations, partnerships, and businesses that changed their fiscal period as part of a restructuring or acquisition.

A Reliable GST/HST Compliance Process

The simplest way to avoid missed deadlines is to close bookkeeping before the GST/HST period ends or immediately afterward. Reconcile bank and credit card accounts, review sales tax collected on invoices, confirm input tax credits are supported by vendor documentation, and identify items with special treatment such as meals, mixed personal-use expenses, real property, or cross-border transactions.

Construction companies, trucking operators, medical professionals, real estate investors, and online businesses often need added attention because the GST/HST result may not match the cash in the bank. Holdbacks, deposits, rebates, exempt supplies, and sales across provincial tax rates can all affect the return.

BOMCAS Canada helps businesses across Canada prepare GST/HST returns, organize books, manage installments, and address overdue filings. The right filing frequency and deadline process should fit the business’s cash flow, recordkeeping capacity, and industry-specific tax obligations.

Treat GST/HST collected from customers as a liability from the moment it is received. A separate reserve account, a recurring bookkeeping review, and a calendar reminder ahead of each reporting deadline can turn GST/HST from a last-minute scramble into a routine part of financial administration.