GST compliance is jurisdiction-specific. This checklist uses Canadian GST/HST rules as its primary example and labels UK VAT rules separately for comparison. If your business is registered in Canada, the core routine is: confirm the reporting period in your Canada Revenue Agency (CRA) account, reconcile tax charged with eligible purchase tax, file a return for every period (including a nil return), remit the amount due by the applicable deadline, and retain the supporting records.
Do not assume that being a small business makes you an annual filer or that a customer’s late payment postpones your tax liability. The invoice date generally determines the Canadian reporting period, and GST/HST charged is payable even when the customer has not paid.
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1. Identify the tax authority and your filing status
Canada: GST/HST
GST/HST obligations depend on Canadian registration and the reporting period assigned to your business. Confirm that your business is registered, which provinces’ HST rules apply to your transactions, and the reporting period shown in your CRA account. A small business is not automatically an annual filer; the default period depends on revenue and some businesses can change their period through the CRA account.
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United Kingdom: VAT is a comparison, not a substitute
UK VAT is a different consumption-tax regime. Its registration, digital-record and deadline rules do not replace Canadian GST/HST rules. Use the UK section below only if your business reports to HM Revenue & Customs (HMRC).
2. Put every reporting period and deadline on a control calendar
Start each period by recording its start date, end date, filing due date, payment due date and the person responsible for review. Check the dates in your CRA account rather than relying on a generic calendar. The following are the general Canadian timings described by the CRA:
| Canadian reporting period | General filing timing | General payment timing | Important qualification |
|---|---|---|---|
| Monthly | One month after the period ends | Generally one month after the period ends, with the return | Confirm the exact date in the CRA account. |
| Quarterly | One month after the period ends | Generally one month after the period ends, with the return | Confirm the exact date in the CRA account. |
| Annual | Generally three months after fiscal year-end | Generally three months after fiscal year-end for most annual filers | Some annual filers have a separate payment date; exceptions apply. |
If a Canadian deadline falls on a Saturday, Sunday or CRA-recognized public holiday, the return or payment is considered on time when received on the next business day. Build in processing time instead of waiting until the final day. Some businesses may also owe instalments, so check the account for additional amounts.
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The December 31 sole-proprietor example
A sole proprietor with a December 31 year-end who had business income for tax purposes generally pays GST/HST by April 30 and files the return by June 15. This example is an exception to the simple “three months after year-end” description and should not be generalized to every annual filer.
3. Assemble the evidence before calculating the return
Capture every taxable sale
Collect sales invoices, receipts and other transaction records for the period. Records must describe the goods or services well enough to determine whether GST/HST applies and to support the tax charged. Separate taxable, zero-rated and non-taxable transactions according to the rules that apply to your business; do not infer the treatment solely from whether cash was received.
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Use the invoice date for the Canadian period
For Canadian GST/HST, the invoice date generally controls which reporting period includes the tax. Include GST/HST charged on an invoice even if the customer has not paid. This creates a cash-flow exposure: the tax can be due before the related receivable is collected.
Document eligible purchases and input tax credits
Gather supplier invoices and payment records for business purchases on which GST/HST was paid or became payable. Correct supplier information supports an input tax credit (ITC) claim. Keep enough detail to show that the expense was for the business, identify the supplier and tax, and connect the amount to the period and return calculation.
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4. Reconcile collected tax, purchase tax and the net amount
Perform the reconciliation before opening the filing screen. Your working papers should bridge the underlying transactions to three outputs: GST/HST collected or collectible on sales, GST/HST paid or payable on eligible business expenses, and the resulting net amount to remit, refund or claim. Include adjustments and prior-period corrections in a separately documented schedule so a reviewer can trace them.
- Agree the sales-tax total to the sales ledger and invoice sequence.
- Check that credit notes, refunds and cancelled invoices are reflected in the correct period.
- Match each claimed ITC to a supplier document with the required details.
- Investigate unusual differences between accounting totals, bank deposits and tax totals rather than forcing the numbers to balance.
- Save the reconciliation with the return working copy and the source-invoice folder.
Canadian GST/HST collected is not ordinary operating cash. The CRA states: “You are responsible to hold the GST/HST in trust until you send it to the Canada Revenue Agency (CRA).” Treat the balance as restricted cash in your forecast so payroll, inventory or other bills do not consume money reserved for remittance.
5. File the return, including a nil return when required
- Open the GST/HST account and select the reporting period that matches the invoices and purchase records you reconciled.
- Enter the sales-tax, ITC and adjustment amounts from your signed working papers.
- Review the resulting amount: it may be payable, refundable or zero.
- Submit the return by the period’s CRA deadline. A zero result still requires submission; use the nil-return process when there is nothing to report.
- Save the confirmation, the submitted figures and the final working copy in a read-only or otherwise controlled location.
Do not file from an unreconciled bank feed or from a draft report that can change after submission. If a correction is needed, preserve the original return and document the correcting entry and the period to which it relates.
6. Remit the amount due and protect cash flow
The CRA says most GST/HST payments are due with the return, although some annual filers have a different payment date. Arrange the payment using the method available in your CRA account and verify that the amount, reference and settlement date are correct. A payment that is initiated but does not clear by the deadline can still create a late-payment problem.
Because tax on an unpaid invoice is generally included in the period of the invoice, monitor receivables separately from GST/HST. Before issuing a large invoice, estimate the tax that will have to be held for remittance. Late or insufficient payments can incur interest, so escalate a shortfall as soon as it is identified rather than waiting for a notice.
7. Keep a complete Canadian GST/HST record file
Records to retain
- Sales invoices, receipts, credit notes and other evidence of tax charged.
- Purchase invoices and import or expense records supporting GST/HST paid or payable.
- General business records needed to explain the goods or services and their tax treatment.
- Reconciliation schedules, adjustment explanations and calculation workbooks.
- Working copies and submission confirmations for electronically filed returns.
- Evidence of payments, refunds or rebates connected with the return.
The records should support the calculation of tax collected, tax paid or payable on eligible business expenses, and any amount refundable, rebated or deductible from net tax. A spreadsheet total without the underlying invoices is not a defensible audit trail.
Retention period
The CRA’s usual rule is to keep records for six years from the end of the year to which they relate. The CRA can require longer retention in particular circumstances, and exceptions or extensions can apply. Do not destroy a file merely because a return has been filed or paid; preserve it for the full applicable period and for any open review, objection or request.
8. UK VAT comparison: different deadlines and digital rules
If your authority is HMRC, use your business tax account for the exact date and allow time for payment to clear. UK VAT returns and payments are usually due one calendar month and seven days after the accounting period. The Annual Accounting Scheme has a different deadline.
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| UK VAT control | General HMRC guidance |
|---|---|
| Return and payment date | Usually one calendar month and seven days after the accounting period; Annual Accounting Scheme arrangements differ. |
| VAT account | Tracks sales VAT, purchase VAT, amounts owed and amounts reclaimable. |
| Digital records | Businesses covered by Making Tax Digital generally must keep specified VAT records digitally in functionally compatible software; exemptions exist. |
| Retention | Generally at least six years; specified OSS/MOSS cases can require ten years. |
Do not transfer Canadian invoice-period assumptions or CRA deadlines to a UK VAT return. Confirm the applicable HMRC scheme, accounting period and digital-record obligation in the business tax account.
9. Choose recordkeeping controls that support compliance
A paper ledger can organize transactions or serve as a working aid, but it is not a compliance solution by itself and cannot replace required digital records. For any bookkeeping system, test the controls rather than choosing on appearance:
- Can it preserve the original sales and supplier invoices and their dates?
- Can it distinguish reporting periods and expose upcoming CRA or HMRC deadlines?
- Can it reconcile sales tax, purchase tax, adjustments and the filed return?
- Can you export working papers and submission evidence for the required retention period?
- For UK businesses covered by Making Tax Digital, does it meet the applicable functional-compatibility and digital-link requirements?
Retain an independent backup of source documents and filed returns. Access controls, a documented review step and a named owner reduce the risk that a changed spreadsheet silently alters a submitted figure.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.10. Troubleshoot the failures that cause most small-business errors
“There was no activity, so we skipped the return.”
Submit the required Canadian nil return for the period. Filing obligation follows the reporting period, not the amount of activity.
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Rebuild the period using invoice dates for Canadian GST/HST, then assess whether a correction is required. Keep the original calculation and the correction trail.
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“The customer has not paid, so we have no GST/HST cash.”
Separate receivable collection from tax liability. Forecast the tax charged on outstanding invoices and reserve it for remittance.
“Our annual deadline was later than expected.”
Check the CRA account for the assigned period, any separate payment date and instalment requirement. The December 31 sole-proprietor dates are not universal.
“The ITC was rejected because the invoice was incomplete.”
Obtain corrected supplier documentation and retain the correspondence. Do not claim an amount that cannot be tied to adequate evidence.
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Compare the deadline with the actual receipt or clearing date, including weekends and CRA-recognized holidays. Keep proof of initiation and settlement and contact the authority if the account does not reflect the payment.
11. A practical close-of-period routine
Assign one person to prepare and another to review, even in a very small business. At each close, lock the transaction period, check invoice numbering, reconcile collected and purchase tax, review unpaid invoices for tax already due, confirm ITC evidence, approve adjustments, submit the return, make the payment and archive the complete file. At year-end, verify that the retention clock is understood and that no records are scheduled for destruction while an authority request or review remains open.
Guidance and deadlines can change. The CRA and HMRC accounts are the controlling sources for your current reporting period, due dates, payment instructions and exceptions; verify them before every filing.
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