Filing your GST/HST return in Canada? A 2026 walkthrough: GST/HST NETFILE step-by-step, the 4-digit access code (and how to get a new one), exact filing deadlines by frequency — including the October 31 quarterly deadline — input tax credits, and the mistakes that trigger penalties.
Applies in: across Canada
File with GST/HST NETFILE — it is free, needs no CRA login, and takes about fifteen minutes. You need three things: your business number, the 4-digit access code the CRA printed on your return package (or shows in your CRA account), and the reporting period's from/to dates. Enter your amounts, review, check the certification box, submit, and keep the 6-digit confirmation number. You must file every period even when you owe nothing, and filing is separate from paying.
Your next deadline depends on your reporting period. Monthly and quarterly filers file and pay one month after the period ends. Annual filers follow the table below. Confirm your expected returns and due dates in CRA My Business Account — the CRA's reporting requirements and deadlines page sets out the same deadlines by frequency. That list is the final word when it disagrees with your memory. When a due date lands on a weekend or public holiday, the CRA treats payment as on time if it arrives the next business day. The nil-return rule still applies. If a period was zero, file the nil return rather than skipping the period. Bank-initiated payments need their own transit time, so start the payment a few business days before the due date rather than on the day.
The CRA assigns your reporting period from your annual taxable supplies, rechecked against the previous fiscal year:
| Annual taxable supplies | You file | Optional |
|---|---|---|
| $1,500,000 or less | Annually | Can elect quarterly or monthly |
| Over $1.5M to $6M | Quarterly | Can elect monthly |
| Over $6M | Monthly | None |
Elections go through the CRA's File an election service or Form GST20. New registrants pick based on estimated supplies. One honest reason to file more often than assigned: refund timing. ITC claimants who spend more tax than they collect get their money back at the frequency they file — monthly filing returns a $5,000/month refund position across the year instead of one cheque twelve months later.
| Frequency | File by | Pay by |
|---|---|---|
| Monthly | 1 month after the period ends (January period → February 28) | Same day |
| Quarterly | 1 month after the quarter ends (Q1 Jan–Mar → April 30) | Same day |
| Annual (corporations and others) | 3 months after fiscal year-end (Dec 31 year-end → March 31) | Same day |
| Annual (individuals with a Dec 31 year-end and business income for the year) | June 15 | April 30 |
The individual exception mirrors income tax: sole proprietors with business income for the year get extra time to file, not extra time to pay. With no business income for the year, an individual filer's deadline is three months after year-end for both filing and payment. Interest starts on any unpaid balance May 1 even though your return is not due until June 15. When a due date lands on a weekend or public holiday, the CRA treats payment as on time if it arrives the next business day.
Your filing frequency is your reporting period, and the CRA assigns it from your annual taxable supplies. At $1,500,000 or less you file annually. Over $1,500,000 and up to $6,000,000 you file quarterly. Over $6,000,000 you file monthly. Charities and listed financial institutions file annually. The count behind those thresholds is taxable supplies made in Canada in your previous fiscal year, including zero-rated supplies and the supplies of your associates. It leaves out supplies made outside Canada, zero-rated exports, zero-rated financial services, exempt supplies, sales of capital real property, and goodwill.
An assigned period is a floor, not a lock. You can elect to file more often than assigned. An annual filer can move to quarterly or monthly reporting. A quarterly filer can move to monthly. Monthly filers have no shorter period to move to. The usual reason to file more often is a refund position. If you pay more GST/HST on purchases than you collect on sales, a monthly return brings that money back twelve times a year instead of once.
To make the change, file an election with the CRA. Online, sign in to CRA My Business Account, or Represent a Client if an accountant files for you, and use the File an election service to submit the GST20 election. On paper, complete Form GST20, Election for GST/HST Reporting Period, and mail it to your tax centre. Keep a copy of the submission with your tax records. Once the CRA processes the election, your account shows the new reporting periods and their due dates, so check the expected-returns list before your next filing date rather than assuming the old calendar still applies.
Going the other way is harder. You cannot simply decide to file less often because a year was slow. A monthly or quarterly filer can elect a less frequent period only after 12 months, and only if taxable supplies have fallen below the threshold for the assigned period. Nothing adjusts on its own. If your sales fall below a threshold and you file no election, the CRA keeps your existing reporting period in place. Plan a change around a period boundary, file the election first, and file every return that falls due under the old period until the new one starts.
The CRA's Instructions for preparing a GST/HST return page publishes a printer-friendly working copy of the GST/HST return (PDF, 116 KB) for exactly this: do the line-by-line math on paper first, check it, then key the numbers into NETFILE. The working copy is a calculation aid, not a form you send — the CRA says not to mail it back. Why it matters for NETFILE filers: NETFILE sessions expire after 35 minutes of inactivity and nothing is saved until you certify, so walking in with completed line totals (total sales on line 101, tax collected on line 103, adjustments on line 104) turns the online session into a copy-and-submit job instead of a scratch-paper scramble. Quebec-administered accounts: the working-copy shortcut still helps, but you file with Revenu Québec, not NETFILE.
1. GST/HST NETFILE — the direct form. Free, no CRA account needed. The CRA's own filing walkthrough runs: enter your business number, access code, and reporting period from/to dates → select options (including the nil-return checkbox and email-notification opt-in) → enter amounts → review → check the certification box → submit. The session expires after 35 minutes of inactivity and nothing is saved if you walk away before certifying. The 6-digit confirmation number after submit means the return is accepted for processing.
You cannot use NETFILE when: you do not have an access code, you need to file an election with the return, your account is administered by Revenu Québec, or the rebate you are claiming is outside the short approved list (GST66, GST189 — Ontario First Nations point-of-sale relief, reason code 23 only — and GST190). File through My Business Account or on paper instead.
2. CRA My Business Account. Once you have the login, this is the most convenient route: the "File a return" link files without an access code, and the same portal holds your balance, payment history, direct-deposit enrolment, pre-authorized debit, and return adjustments (through "Adjust a return" in My Business Account, or by letter to your tax centre).
3. Accounting software / EDI. Cloud accounting platforms (QuickBooks Online, Xero) prepare the return from your books and generate the CRA submission; accountants file through the Represent a Client portal. Useful once the return has more than a handful of lines — and it means your province-level rate split (the place-of-supply numbers) reconciles before you submit, not after.
Paper is the exception, not a fourth way. For reporting periods beginning on or after January 1, 2024, all GST/HST registrants other than charities and selected listed financial institutions must file electronically. Filing on paper when the mandate applies draws a penalty; a registrant who genuinely cannot file electronically can ask the CRA for an exemption in writing.
The 4-digit GST/HST access code is printed on the electronic filing information package (Form GST34-3) or the personalized return (Form GST34-2) the CRA mailed you, and it has been shown under your GST/HST details in your CRA account since October 2025. Lost it? Change it online at Get a GST/HST access code (works if you filed a return in the last 3 years) or call CRA business enquiries at 1-800-959-5525. Treat it like a password — anyone with your business number, access code, and period dates can file in your name.
ITCs are the return's reward side: the GST/HST you paid on business purchases reduces what you remit, or comes back as a refund. Three discipline rules from the CRA's own playbook:
If you file annually and your net tax was at least $3,000 last year and is estimated at $3,000 or more this year, you pay quarterly instalments: due one month after each fiscal quarter end (a fiscal quarter ending June 30 pays by July 31). Instalments are usually one quarter of last year's net tax each; you can base them on a lower current-year estimate, with instalment interest charged on any shortfall — Guide RC4022 sets out the test and the calculation. The $3,000 threshold mirrors income tax's instalment trigger. Instalments are payments only, not returns — the return still comes once a year. Miss the trigger or miss an instalment and interest accrues; the instalment payments net against the final balance.
The penalty formula: 1% of the amount owing, plus 0.25% for each full month the return is late, up to 12 months — plus interest on the unpaid balance. Three points the CRA's GST/HST filing penalties page makes plain:
For the full picture — worked cost examples, the $250 demand-to-file penalty, and the recovery sequence — see What Happens If You File Your GST/HST Return Late in Canada.
If your GST/HST account is administered by Revenu Québec, you do not file with the CRA at all — your returns (GST/HST and QST) go through Revenu Québec (clicSÉQUR). NETFILE's eligibility list explicitly excludes Quebec-administered accounts, and Guide RC4022 states the underlying rule: in Quebec, Revenu Québec generally administers the GST/HST, and a business physically located in Quebec files its returns with Revenu Québec using its forms, unless it is a selected listed financial institution. Registering with the CRA when you carry on business in Quebec is the mistake our registration guide warns about: it leaves the QST half undone.
Treating the return and the payment as one act. Filing without paying is legal and penalty-free; paying without filing leaves an overdue return. Do both, but never skip the return because the cash is tight.
Forgetting the nil return. Zero-balance periods still need filing. NETFILE's nil checkbox takes seconds; a missed nil return creates a gap the CRA chases.
Claiming ITCs without the paperwork. The receipt does not travel with the return — but if the CRA asks and you do not have the supplier's GST/HST number on a $100+ invoice, the ITC is denied. Rebuild the document file every quarter, not every audit.
Forgetting that ITCs expire. Four years feels generous until the supplier closes or the receipt lives in a box from 2022. Unclaimed credits from old periods are money left on the table; claim them on the next return.
Re-filing instead of adjusting. A second return for the same period does not fix the first — it creates a conflict. Adjust through My Business Account ("Adjust a return") or by mailing a signed letter to your tax centre.
| Monthly filer — over $6M annual taxable supplies | File and pay 1 month after each period ends |
|---|---|
| Quarterly filer — $1.5M to $6M | File and pay 1 month after each quarter ends |
| Annual filer — corporation / other | File and pay 3 months after fiscal year-end |
| Annual filer — individual with Dec 31 year-end | Pay April 30, file by June 15 |
| Annual filer + net tax ≥ $3,000 | Quarterly instalments: 1 month after each fiscal quarter end |
| Deadline on a weekend or public holiday | Rolls to the next business day |
Frequency is assigned from the previous fiscal year's taxable supplies. File more often if you like (Form GST20 election); you cannot file less often than assigned. Net tax ≥ $3,000 for annual filers triggers quarterly instalments.
Yes. You must file every return for every reporting period, even when every field is zero. NETFILE has an explicit 'I am filing a nil return (all fields are $0)' checkbox to speed that up. Skipping periods you owe nothing on is still late filing, and it creates gaps in your account the CRA will chase.
Yes, two ways: file through CRA My Business Account (the 'File a return' link files without a code), or get a new code — it is shown under your GST/HST details in your CRA account, you can change it online if you filed a return in the last 3 years, or call the CRA at 1-800-959-5525. The standalone NETFILE form needs the 4-digit code; your account login substitutes for it inside My Business Account.
Monthly and quarterly filers: one month after the period ends. Annual filers: three months after fiscal year-end — except individuals (sole proprietors) with a December 31 year-end who had business income for the year, who pay by April 30 and file by June 15 — with no business income for the year, the three-month deadline applies instead. A deadline that lands on a weekend or public holiday rolls to the next business day.
If you owe a balance: a penalty of 1% of the amount owing plus 0.25% for each full month late, up to 12 months, plus interest on the unpaid balance. If you owe $0 or are due a refund there is no penalty, but a late refund return delays your money. File on time even when you cannot pay in full — an on-time return with an unpaid balance skips the late-filing penalty entirely and you only carry interest until you settle up.
Yes, to a shorter period. Use the CRA's File an election service or Form GST20 to move from annual to quarterly or monthly, or from quarterly to monthly. Why would you? Refund claimers file more often to get their money back sooner — a business owed $5,000 in ITC refunds a month gets $60,000 back across a year on monthly filing instead of one year-end cheque.
File an election. In CRA My Business Account or Represent a Client, use the File an election service and pick GST20, Election for GST/HST Reporting Period. On paper, fill out Form GST20 and mail it to your tax centre. An annual filer can elect quarterly or monthly reporting, and a quarterly filer can elect monthly. The new period takes effect at the start of a reporting period, and the CRA shows your updated filing obligations in your account once the election is processed.
Only in narrow cases, and never automatically. If you were assigned monthly or quarterly filing, you can elect a less frequent period only after 12 months and only if your taxable supplies have fallen below the threshold for your assigned period. If your sales drop and you file no election, you keep the period you already have. Electing to file more often is the easy direction. Coming back down takes the 12-month wait plus the lower sales to support it.
Confirm or change it rather than re-filing. In My Business Account use the 'Adjust a return' option, or mail a signed letter to your tax centre with the corrected amounts. Do not file a second return for the same period — an adjustment request changes the original.
Most registrants have four years — the deadline is the due date of the return for the last reporting period ending within four years after the period the credit could first be claimed. Listed financial institutions get two years, and so do businesses whose threshold amounts exceed $6 million in both the current and the previous fiscal years, subject to a 90%-taxable-supplies exception (charities keep four). Missed ITCs are not lost if you are inside the window: claim them on a later return. Outside it, they are gone.
No. If your account is administered by Revenu Québec, you file your GST/HST (and QST) returns with Revenu Québec — GST/HST NETFILE explicitly excludes Quebec-administered accounts. You also cannot use NETFILE when you need to file an election with the return, or when the rebate you are claiming is not on NETFILE's short approved list (only GST66, GST189 (Ontario First Nations point-of-sale relief, reason code 23 only), and GST190 can be claimed during filing).
They are separate acts, with the same deadline. Filing tells the CRA what you owe; paying is its own step — CRA My Payment, online banking bill payment, pre-authorized debit in your CRA account, or in person at your financial institution with a remittance voucher. Filing without paying is legal and avoids the late-filing penalty; paying without filing leaves the return overdue.
Only the calendar date. October 31, 2026 falls on a Saturday, so the CRA's weekend rule rolls your filing and payment deadlines to Monday, November 2, 2026 — the same nil-return, frequency, and penalty rules apply to the rolled date. Treat the roll as breathing room for the payment to clear, not as an extension: initiate bank payments a few business days before November 2 rather than on the day itself.
The filing mechanics are the same, but the numbers you enter are harder: you charged different rates by customer province under the place-of-supply rules, so your return totals blend 5%, 13%, 14%, and 15% lines. Keep province-level sales records so the return is a summary, not a reconstruction. If you are registered under the simplified GST/HST regime, you file the simplified return using GST/HST NETFILE.
The tiers run on the invoice total, and they exist so your customer can claim input tax credits: under $100, your business or trading name, the date, and the total; at $100 or more, add the GST/HST charged — or a statement that the total includes it — and your GST/HST registration number; at $500 or more, add the buyer's name, a description of each supply, and the payment terms. Show HST as one combined line, never split into federal and provincial parts. The worked version, including the Quebec difference, is in [How to Charge GST/HST in Canada](/guides/how-to-charge-gst-hst-in-canada/).