I filed my HST but I missed some invoices, how do I adjust an HST return that has been filed

Hi cathy-cathykorpi,

Welcome to Community!  QuickBooks Online provides the features you need to ensure you're sales tax is recorded accurately.  I'd be glad to assist!

Initially, I suggest unfiling the return, if you you haven't made payment.  This will allow you to ensure all transactions have been recorded, so your sales tax filing is accurate.  Follow these steps to unfile the sales tax;

1. From the left menu, open Taxes and then Sales tax

2. Select the Filings tab

3. Click on the ▼ dropdown menu to the right of the item to be unfiled and select Undo filing

4. When you're ready, select Prepare return

5. Review the information and hit Adjust for Tax Collected, as you see necessary

6. Hit Save and then Mark as filed

Here's a valuable guide, for your reference.

Should you require additional assistance, please don't hesitate to contact us.  We'd love the opportunity to work with you in real time and ensure you're able to meet your sales tax goals as soon as possible!

Schedule a Callback or start a Chat: click (?) Help in the upper right in QuickBooks Online > enter "Contact support" > hit Contact Us > provide a brief summary of your situation > hit Let's Talk > choose Get a callback or Start a Chat.
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Feel free to reach back out with other questions.  We're always happy to help!