GST/HST Return Filing Dates 2026: Your Exact Deadline by Reporting Period

Your GST/HST Filing Deadline, by Reporting Period

Every GST/HST-registered business is assigned a reporting period — monthly, quarterly, or annual — based on annual taxable supplies from the prior fiscal year. That reporting period determines your due date, and the rule is different for each tier. Here's the deadline structure straight from CRA's reporting-requirements page:

Two things trip people up in that table. First, for monthly and quarterly filers, the filing deadline and payment deadline are the same date — there's no split. Second, for most annual filers the same is true: file and pay on the same day, 3 months out. The split only shows up for one specific group, and it's worth its own section because it's the single most common source of confusion in the GST/HST filing calendar.

Worked Examples: Your Exact Deadline for a December 31 Year-End

Most small businesses in Ontario run a calendar fiscal year. Here's what that means concretely for each filer type, based on CRA's own quick-reference examples:

If your fiscal year-end isn't December 31, the same logic applies — just count forward from your actual year-end. An August 31 corporate year-end means a November 30 filing and payment deadline. If any calculated due date falls on a Saturday, Sunday, or a CRA-recognized public holiday, CRA treats your return or payment as on time as long as it's received the next business day.

The Self-Employed June 15 Quirk — Why Two Different Dates Exist

This is the part that catches self-employed Ontarians every year: your GST/HST payment is due April 30, but you have until June 15 to actually file the return. It only applies if all three of these are true — you're an individual with a business (a sole proprietor), your fiscal year-end is December 31, and you had business income for tax purposes that year.

CRA built this exception to line up with the personal income tax filing deadline for self-employed individuals, which is also June 15. But the payment deadline for any balance owing — income tax or GST/HST — stays at April 30 for everyone, self-employed or not. The result is a gap: you can legally wait until mid-June to file the paperwork, but if you owe net tax, interest at the CRA's prescribed rate (7% for Q3 2026) has already been accruing since May 1.

The practical move: calculate your net tax owing by April 30 and pay it even if you're not ready to file the full return yet. Most GTA bookkeepers who work with self-employed clients treat April 30 as the real deadline and June 15 as a paperwork buffer, not a genuine extension. If you don't meet all three criteria — say, your sole proprietorship had a loss and no business income for the year — you lose the extension and revert to the standard 3-months-after-year-end rule, which for a December 31 year-end is March 31.

How CRA Assigns Your Reporting Period

You don't choose monthly, quarterly, or annual by default — CRA assigns it based on your annual taxable supplies (total revenue from taxable and zero-rated sales in Canada) from your preceding fiscal year, combined across your business and any associated entities:

You can voluntarily elect a more frequent reporting period than assigned — filing Form GST20 to move from annual to quarterly, for instance — which some businesses do specifically to get input tax credit refunds faster rather than waiting up to a year. Moving to a less frequent period only works after your taxable supplies have stayed below the threshold for a full 12 months, and CRA will not do this automatically. If you don't file the election, you keep your previously assigned reporting period indefinitely, even after your revenue drops.

Instalments: The Deadlines Inside the Deadline

Filing once a year doesn't always mean paying once a year. If you're an annual filer and your net tax for the previous fiscal year was $3,000 or more, you likely have to make quarterly instalment payments during the current fiscal year — estimated payments toward the tax you'll owe on your eventual annual return. Each instalment is due 1 month after the fiscal quarter ends:

If your business has branches or divisions filing separate returns, the $3,000 threshold applies to the combined net tax across the whole business, not each branch on its own. There's also a special rule for businesses in their second fiscal year of operation, which uses a different calculation to determine whether instalments apply — worth confirming directly with a bookkeeper or accountant if you registered partway through last year. Underpaying or missing an instalment doesn't trigger the late-filing penalty, but it does trigger interest on the shortfall at the same prescribed rate as a late annual balance.

What a Missed Deadline Actually Costs

Two separate charges can apply if you miss a GST/HST deadline with money owing: a late-filing penalty and interest. They stack.

The late-filing penalty formula is A + (B × C), where A is 1% of the amount owing, B is 25% of A, and C is the number of complete months the return is overdue, capped at 12 months. Worked out: a business that owes $8,000 and files 3 months late pays $80 (1% of $8,000) as the base penalty, plus 25% of that $80 — $20 — multiplied by 3 months, adding another $60. Total penalty: $140. There's no late-filing penalty at all if you owe $0 or are due a refund — but a nil return still has to be filed on time to avoid a demand-to-file penalty.

Interest applies separately and compounds on any unpaid balance from the day after the payment due date, at the CRA's prescribed rate — 7% annually for Q3 2026 (July 1 – September 30), reviewed and reset every calendar quarter. On that same $8,000 balance sitting unpaid for 3 months, interest alone adds roughly $140 more, on top of the $140 penalty. Filing electronically when you're required to (which is now every registrant except charities and selected listed financial institutions, for periods ending in 2024 and later) is a separate obligation with its own penalty — $100 for the first paper-filed return, $250 for each one after that — regardless of whether tax is owed.

Common Mix-Up: This Is a Different Deadline Than the GST/HST Credit

If you searched for GST return dates hoping to find when your next personal payment lands, you're looking for a different program. The GST/HST return is a business filing obligation — a registered business collects GST/HST on sales, claims input tax credits on eligible purchases, and remits the net difference to CRA by the deadlines above. The GST/HST credit is an income-tested benefit CRA pays directly to individuals and families to offset sales tax on everyday purchases, with no business registration required. See our full breakdown of the GST/HST credit for eligibility, the exact 2026 payment amounts, and the quarterly payment dates — or the related Canada Groceries and Essentials Benefit, which replaces the GST/HST credit starting July 2026 with a 25% higher benefit amount.

Building Your Own Filing Calendar

The fastest way to avoid a missed deadline is to know your exact assigned reporting period and fiscal year-end, then work forward from the rules above rather than guessing. Your CRA My Business Account shows your specific due dates and reporting period directly — it's worth checking once a year even if your revenue hasn't changed, since CRA won't notify you if a threshold crossing changes your assignment. (Our CRA My Account guide covers how to find these screens.) If you also run payroll, the July 2026 CRA payroll changes land on a separate remittance calendar worth syncing at the same time.

• Monthly or quarterly filer: mark 1 month after every period-end, filing and payment together.
• Annual filer (corporation or no-income sole proprietor): mark 3 months after your fiscal year-end.
• Self-employed with business income, calendar year-end: pay by April 30, file by June 15 — but don't wait for June 15 if you owe money.
• Annual filer with $3,000+ prior-year net tax: add the four quarterly instalment dates on top of your annual filing deadline.

The businesses that get penalized aren't usually the ones that can't pay — they're the ones that lost track of which deadline applied to them after a reporting period changed, a fiscal year-end shifted, or a sole proprietor mistakenly applied the June 15 exception to a year they weren't eligible for it.