An unpaid customer invoice can still create a GST/HST reporting obligation. Under the general timing rule, tax is generally reported in the period when it becomes collectible—not necessarily when the customer’s money reaches your bank account. For many ordinary business invoices, that means the HST is reported in the period that includes the invoice date, even if the customer pays weeks later.
This matters for cash flow. A business may have to remit HST before it has received the full invoice amount. The exact timing can depend on the transaction, the written agreement and special rules, so do not apply the same assumption to every contract or payment arrangement.
The general rule: when does HST become collectible?
For a typical taxable sale, the general rule looks to the earlier of when consideration is paid and when it becomes due. Consideration can become due on the day an invoice is first issued, the date of the invoice, the date an invoice should have been issued if there was an undue delay, or the date payment is required under a written agreement. The precise facts matter.
If an invoice is issued before payment, the CRA says the GST/HST charged on that invoice is generally included in the reporting period covering the invoice date, even if the business has not collected the tax. This is why an owner should not use only the bank statement to decide what belongs on the return.
A simple example: the customer pays next month
Suppose an Ontario consulting business completes work and issues an invoice on September 28 for $10,000 plus 13% HST of $1,300. The total invoice is $11,300 and the customer has 30 days to pay. The customer does not pay until November 15.
Under the general rule for this ordinary invoice, the $1,300 HST is included in the GST/HST reporting period that contains September 28. The business does not wait until November simply because the payment has not arrived. The $10,000 receivable remains open in the books until it is collected, adjusted or written off.
The example assumes a standard taxable service and the general timing rule. A written payment agreement, progress payments, real property leases, special accounting methods or other statutory timing rules may change the analysis. Review the contract and transaction details where the timing is not straightforward.
Why this creates a cash-flow problem
The business has recorded a sale and an amount due from its customer, but it may not have received the cash needed to pay the HST. If the owner spends the amount received from other customers without setting aside the tax associated with outstanding invoices, the remittance can become difficult to fund.
This is one reason bookkeeping should track both accounts receivable and HST payable. The bank balance shows the cash available today. The receivables report shows amounts expected from customers. The HST records show tax that may already be reportable even though some customer invoices remain unpaid.
What if the customer pays only part of the invoice?
Partial payments can have timing consequences. The GST/HST rules generally consider when each amount is paid or becomes due. If a contract requires deposits or progress payments on separate dates, do not assume the whole contract follows the same date as the final invoice. Track the agreement, payment milestones and invoices so the correct period can be identified.
For example, a contractor may agree in writing that a customer pays a deposit when a project begins and a second amount when a milestone is reached. The tax timing for each portion should be assessed under the applicable rules. A bookkeeping system should preserve the supporting agreement and link the payment and invoice records.
What if the customer never pays?
If the business has already reported and remitted the GST/HST on an arm’s-length credit sale and the amount owed becomes a bad debt, the CRA provides a mechanism to recover the GST/HST as a bad debt adjustment. The business generally needs to write off the amount owing as a bad debt in its records and meet the applicable conditions.
A payment that is merely late is not automatically a bad debt. Sending a reminder or moving an invoice into an overdue column does not, by itself, establish that the balance qualifies. Keep evidence of collection efforts, the write-off decision and the accounting entry. If the customer later pays some or all of the amount, the recovered portion may need to be accounted for in a later return.
How to manage unpaid invoice HST in practice
Issue invoices promptly and use clear payment terms in the customer agreement.
Record the invoice date, taxable amount, tax rate, HST amount and due date.
Review aged receivables every month and follow up before balances become seriously overdue.
Reconcile sales invoices to the GST/HST return, not only to bank deposits.
Maintain a separate cash reserve for tax that may be due before customer cash arrives.
Document credit notes, cancellations, write-offs and later recoveries.
Check unusual contracts or payment schedules against the CRA’s timing rules.
Scenario A: A marketing consultant with one overdue customer
A consultant bills $6,000 plus $780 HST on October 30 and the client has 30 days to pay. The client asks for extra time and pays in December. If the general timing rule applies, the consultant reports the $780 in the period that includes the invoice date. The receivable remains outstanding in the accounting records until payment is received.
The consultant should not delete the invoice or change its date simply because the customer is late. Doing so can make sales reporting, receivables and the tax return inconsistent. The better approach is to keep the invoice intact, track the overdue balance and plan the cash required for the remittance.
Scenario B: A customer pays after the debt was written off
A business reports and remits HST on a $2,260 invoice, including $260 of HST. After reasonable collection efforts, it writes off the qualifying bad debt and claims an adjustment under the CRA rules. Several months later the customer pays $1,130. The business must review the bad-debt recovery rules and account for the recovered amount appropriately; it should not keep the original adjustment without considering the later payment.
Scenario C: Several invoices are unpaid at quarter-end
A service business has $25,000 of invoices outstanding on the last day of its HST quarter. Some invoices are new, one is disputed and another is several months old. The owner should not treat all $25,000 as one tax adjustment. Each invoice should be reviewed for its issue date, agreement terms, tax treatment, payments, credit notes and whether any debt has actually been written off.
How bookkeeping helps prevent surprises
A monthly bookkeeping process should connect each sales invoice to the accounts receivable balance and the sales tax records. It should also distinguish payments received from invoices still outstanding. That gives the owner a clearer view of tax obligations and makes it easier to explain why HST payable does not move in line with cash deposits.
Presyz provides bookkeeping support to help organise sales, customer balances and the records behind GST/HST reporting. For businesses that need help preparing or reviewing their tax returns, see the
What should you do before filing?
Before filing, compare the sales ledger with invoices and credit notes for the reporting period. Confirm that tax was applied to the correct supplies, that invoice dates and written payment terms have been reviewed, and that bad-debt adjustments are supported. Check that amounts already paid or refunded have been posted to the correct accounts.
If an invoice is disputed, cancelled or partly paid, document what happened and obtain advice before changing the tax treatment. If the business uses a special method or the contract contains unusual payment terms, confirm which timing rule applies rather than relying on a general online example.
Frequently asked questions
Do I wait until the customer pays before reporting HST?
Not necessarily. Under the general rule, the invoice date or another earlier due date can determine the reporting period even where the customer has not paid. Check the transaction and agreement for special rules.
Can I claim a bad debt adjustment for any overdue invoice?
No. The debt must meet the applicable conditions. An invoice being past due is not enough by itself; the business should document the write-off and review the CRA requirements.
What if I receive payment after a bad debt adjustment?
A later recovery generally needs to be accounted for. Keep a record of the amount recovered and review the relevant return instructions before filing.
Official references
CRA: When to report charging and collecting discrepancies, including unpaid invoices and bad debts.
General educational content only. Verify current CRA and provincial guidance before acting.