If your business operates in Canada, GST/HST compliance starts with three questions: whether you must register, which reporting period the Canada Revenue Agency (CRA) assigned you, and whether your records prove every number on your return. Most businesses use a $30,000 small-supplier threshold, but the calculation and registration date depend on the type of supply, associated persons, and how the threshold was exceeded.
Once registered, you must file every assigned GST/HST return—including a nil return when there were no sales or net tax—and pay by the applicable deadline. Keep invoices, receipts, calculations, and electronic return copies so the CRA can verify tax collected and input tax credits (ITCs). The rules below are for Canada; other countries use different GST systems and deadlines.
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Do you need to register for GST/HST?
Registration is generally mandatory when a business is no longer a “small supplier” under the CRA rules. The test is not simply your total annual sales. For most businesses, you examine taxable supplies in one calendar quarter and in the four consecutive calendar quarters that came before it.
The general $30,000 small-supplier test
The CRA’s current guidance identifies $30,000 as the general small-supplier threshold for most businesses. You must assess taxable supplies over the relevant quarter and the preceding four-quarter period. The calculation can be affected by supplies made by associated persons and by exclusions in the CRA rules, so do not apply a simple “calendar-year sales under $30,000” shortcut.
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- Include the taxable supplies that the CRA says belong in the small-supplier calculation.
- Review whether corporations, partnerships, or other persons are associated with your business for this test.
- Separate supplies that are excluded or treated differently under the CRA’s registration rules.
- Document the period-by-period calculation so you can explain why you did or did not register.
When you cross the threshold
Registration timing depends on how the threshold is exceeded. If taxable supplies exceed the threshold in a single calendar quarter, registration generally takes effect on the supply that causes the business to go over the limit, and GST/HST generally applies from that point. If the threshold is exceeded by adding supplies across four consecutive calendar quarters, the effective date follows a different CRA rule. Confirm the exact date in the CRA registration guidance before charging tax or issuing invoices.
Public service bodies and special cases
The CRA identifies a separate $50,000 small-supplier threshold for public service bodies. Charities and public institutions can have additional conditions. Businesses with unusual structures, exempt and taxable activities, or related entities should verify the applicable rule rather than relying on the general $30,000 figure.
What registration changes
After registration, you account for GST/HST on taxable supplies, file returns for the reporting periods assigned to your account, and may claim ITCs for eligible GST/HST paid or payable on purchases used in commercial activities. Registration also creates an ongoing filing obligation: closing the account or having no activity does not automatically remove the requirement to submit the final or nil return for the relevant period.
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Keep the CRA account information that states your reporting period and filing deadlines. The period is assigned under CRA rules based in part on revenue, and changing frequency is subject to eligibility and account-specific conditions; it is not an unrestricted choice among monthly, quarterly, and annual filing.
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Reporting periods and deadline differences
Your reporting period controls both the administrative rhythm and the date by which the return and payment are due. The table shows the CRA’s general timing rules; your personalized CRA account and the instructions for your period control if they differ.
| Reporting period | General filing and payment timing | Cash-flow effect | Administrative workload |
|---|---|---|---|
| Monthly | Generally one month after the period ends | Tax collected is remitted quickly, reducing the time funds can remain in the business | Frequent reconciliations and twelve returns each year |
| Quarterly | Generally one month after the quarter ends | More time between remittances, but larger amounts may be due at once | Four returns each year; records still need to be kept continuously |
| Annual | Generally three months after fiscal year-end | Longer interval before a regular remittance, requiring disciplined cash segregation | One return, but a year of transactions must be complete and reconciled |
These are general rules, not a guarantee that every account qualifies for a particular cadence. Check the due date shown in the CRA account for each reporting period. When a due date falls on a CRA-recognized weekend or public holiday, the CRA says the next business day is timely.
The annual sole-proprietor exception
A qualifying sole proprietor with business income, a December 31 fiscal year-end, and the other conditions in the CRA guidance generally has a split deadline: payment is due April 30, while the return is due June 15. This exception applies only when the stated eligibility conditions are met. Do not use June 15 as a universal GST/HST payment deadline.
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- Confirm the period and deadline. Open the CRA account and identify the reporting period ending, filing due date, and payment due date. Note whether the account has any special instructions.
- Close the books for that period. Reconcile sales, refunds, credit notes, purchases, and tax amounts to your bank, point-of-sale, invoicing, and expense records. Keep adjustments tied to the original transaction.
- Total GST/HST charged or collectible. Include tax on taxable supplies according to the applicable rules, whether or not a customer has paid you. Review invoices for missing or duplicated tax.
- Determine eligible ITCs. Identify GST/HST paid or payable on qualifying purchases used in commercial activities. Match each claim to an invoice or receipt containing the information needed to substantiate it.
- Calculate net tax. The return compares GST/HST collected or collectible with eligible ITCs and any permitted adjustments, rebates, or deductions. Preserve the worksheet that ties the reported figures to your ledger.
- File by the stated deadline. CRA guidance says registrants generally must file electronically for reporting periods ending in 2024 and later. Charities and selected listed financial institutions are exceptions, and a person unable to file electronically can request an exemption that is considered case by case.
- Pay any balance and retain proof. Keep the confirmation, payment record, and a working copy of the electronically filed return with the period’s supporting documents.
Nil returns are still required
Not trading does not cancel a filing obligation. The CRA states: “You must file a return for each reporting period even if you: Have no business transactions or income; Have no net tax to remit; Are closing a GST/HST account (you need to file a final return).” Submit the nil or final return for the assigned period instead of leaving it outstanding.
Filing and payment are separate actions
A return can be filed without the amount owing being paid, so track both tasks. For monthly and quarterly filers, the general rule is one month after period-end for both filing and payment. Most annual filers have three months after fiscal year-end. The qualifying sole-proprietor exception described above separates the April 30 payment date from the June 15 filing date.
What records must you keep?
The CRA says, “You must keep certain records to support your GST/HST returns and claims.” A useful record system lets an independent reviewer trace each return line to an underlying transaction and see why tax was collected, remitted, or claimed as an ITC.
Core GST/HST records
- Sales invoices, receipts, contracts, and credit notes showing the supply, date, customer information where required, price, and tax charged.
- Purchase invoices and receipts supporting GST/HST paid or payable on commercial purchases.
- Import, customs, and other documents that substantiate tax paid on goods or services brought into the business.
- Bank, payment-processor, point-of-sale, and cash records that reconcile to reported sales and refunds.
- General ledgers, journals, spreadsheets, and workpapers showing how collected tax, ITCs, adjustments, rebates, and deductions were calculated.
- Copies of filed returns, including working copies of electronically filed returns, plus payment confirmations and CRA correspondence.
- Records explaining changes in use, bad debts, returned goods, asset purchases, or other adjustments included in a return.
Retention period
The usual CRA retention period is six years after the end of the year to which the records relate. The CRA’s GST/HST Memorandum 15-1, dated September 2026, notes that special circumstances can require longer retention. If a dispute, objection, appeal, or audit remains open, preserve the relevant records until the matter is resolved and the CRA’s retention requirements are satisfied.
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Electronic records must remain electronically readable throughout the required period. A file that exists but cannot be opened, searched, or connected to the transaction it supports is not a practical compliance record. Maintain reliable backups and preserve exports when changing accounting systems.
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How input tax credits work
An ITC generally recovers GST/HST paid or payable on eligible purchases used in commercial activities. It is not an automatic deduction for every business expense. The purchase must meet the commercial-use and documentary requirements, and the tax amount must be supported by acceptable supplier documentation.
Build an ITC file for each claim
- Store the supplier invoice or receipt with the transaction date, supplier identity, description, amount, and tax information required for the claim.
- Mark the business purpose and, where an item has mixed personal and commercial use, retain the allocation method and calculation.
- Match the document to the ledger entry and the reporting period in which the ITC is claimed.
- Keep evidence for adjustments, returned purchases, credits, and later changes in use.
Most registrants generally have four years to claim an ITC, although exceptions apply, including for some larger registrants and listed financial institutions. The deadline to claim does not remove the requirement to prove eligibility, so do not postpone document collection.
A practical deadline and records workflow
At the end of every month
- Reconcile sales and tax collected to invoices, payment systems, and bank deposits.
- Capture supplier documents while they are available and flag missing invoices.
- Separate GST/HST from the underlying expense in the ledger.
- Set aside collected tax so a later remittance does not become a cash-flow surprise.
Before each return is filed
- Confirm the reporting period and account-specific due date.
- Run an exception report for transactions without tax codes or supporting documents.
- Review unusual refunds, credits, large asset purchases, and mixed-use expenses.
- Prepare a reconciliation from gross sales to taxable supplies, tax collected, ITCs, and net tax.
- File electronically when required, save the confirmation, and schedule payment separately if needed.
After filing
- Store the final return, working papers, payment proof, and supporting invoices together by period.
- Record any balance paid or refund received and reconcile it when it appears in the bank account.
- Calendar the next filing date immediately; do not rely on memory.
- Keep the record set readable and backed up for the full retention period.
Common compliance mistakes and fixes
Using annual sales as the only registration test
Problem: A business stays below $30,000 for the calendar year but crossed the threshold in one quarter or through the preceding four-quarter test. Fix: Recalculate taxable supplies by the CRA periods, review associated persons and exclusions, and determine the effective registration date from the way the threshold was crossed.
Charging tax before confirming the effective date
Problem: Invoices show GST/HST from an unsupported date, or the business fails to charge it after registration became required. Fix: Document the threshold calculation and registration effective date, then correct invoices and bookkeeping consistently.
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Skipping a no-activity return
Problem: The owner assumes no sales means no filing. Fix: File the required nil return for every assigned period, including the final return when closing the account.
Claiming ITCs without invoices
Problem: A bank statement proves payment but does not contain all information needed to substantiate the tax claim. Fix: Obtain and retain the supplier invoice or receipt and document any commercial-use allocation.
Confusing the filing date with the payment date
Problem: A return is filed on time but the remittance is late, or the annual sole-proprietor exception is misunderstood. Fix: Calendar both obligations and verify the dates in the CRA account.
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Small-business GST/HST checklist
- Identify that the rules being applied are Canadian GST/HST rules.
- Calculate taxable supplies for the relevant calendar quarter and preceding four consecutive quarters.
- Check the general $30,000 threshold, the $50,000 public-service-body threshold where relevant, associated persons, and exclusions.
- Determine the registration effective date based on how the threshold was exceeded.
- Record the CRA-assigned reporting period and every account-specific due date.
- File every return, including nil and final returns.
- Reconcile tax collected or collectible, eligible ITCs, adjustments, rebates, and deductions.
- Retain sales and purchase documents, ledgers, workpapers, electronic return copies, and payment proof.
- Keep records usually for six years after the end of the related year, extending retention when CRA rules or an unresolved matter requires it.
- Verify electronic-filing requirements for each period and request an exemption if genuinely unable to file electronically.
Late filing or payment can result in penalties and interest. If a deadline has been missed, file the outstanding return promptly, pay what you can, preserve the explanation and supporting records, and check the CRA account for the balance and any notices. For a registration date, reporting-period assignment, or ITC issue that depends on your specific facts, use the current CRA guidance or obtain professional tax advice rather than applying a general rule mechanically.
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