Confirm the period and calculation method
Use the reporting period assigned to the business, rather than assuming every taxpayer follows calendar quarters. Confirm whether the regular method or an elected method applies. Sales, credits and adjustments should be prepared consistently with that method.
For an Ottawa consultant, Ontario’s ordinary 13% HST rate may apply to relevant taxable supplies, but destination and supply facts still matter. Zero-rated or exempt items need their own classification. A software total is useful only after the underlying records have been reviewed.
Worked example: a regular-method quarter
Assume a hypothetical Ottawa business has $28,000 of sales fully subject to 13% HST for the quarter ended June 30, 2026. HST charged is $3,640. With $940 of eligible input tax credits and no other adjustments, net tax is $2,700.
If a verified $700 payment is already allocated to that period, the remaining unpaid amount would be $2,000 before any account charges or other items. A payment to personal income tax or payroll cannot simply be deducted from this GST/HST calculation.
Apply the actual due date
The June 30, 2026 quarter’s ordinary filing and payment date was July 31, 2026, now past. A calendar quarter ending September 30 ordinarily points to October 31; because October 31, 2026 is Saturday, CRA’s next-business-day rule makes November 2 the practical date.
Annual reporting follows different rules and some annual filers have instalments. Do not reuse this quarterly deadline for an annual sole proprietor. Registered businesses generally still file for a reporting period with no activity or no net tax to pay.
Close the return and payment trail
Retain the reconciliation, material invoices and credits, filed return and confirmation number. Record the payment amount, program account, period and bank confirmation, then verify posting. A planned transfer or a prepared return is not proof of completion.
If the account does not match the worksheet, investigate adjustments, prior balances, interest and allocation rather than changing sales figures to force agreement. The completed record should explain the business calculation and the authority’s account separately, with remaining differences assigned for review.
Put this into practice
Sources and current guidance
A practical next step
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