Welcome to the QuickBooks Community. I know how busy this time of year can be for business owners, so it's crucial that you know which forms you're supposed to file with the CRA or not. Your situation sounds fairly unique, so I advise you to check in with an accounting professional, or even with the CRA directly. I found this resource on the CRA website that may be helpful in your situation: What to do if an employee leaves. Here's where you can find the information to get in touch with the CRA if you decide that you'd like to go that route: Contact the CRA.
If you'd prefer to reach out to your accountant about this, that's also a smart choice. Your accountant can actually join you directly in QuickBooks to take a look at your payroll information so they can help you make an informed choice. Just navigate to the My Accountant tab within QuickBooks Online and send an invite. You'll also see the Find a pro to help button on that page which is great if you're not working with an accountant just yet. This'll take you to our database of QuickBooks-certified ProAdvisors who can give you a hand with questions like these.
Take care. I know you'll have this sorted out in no time.
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