I need to include additional informatio on the 2021 W-2 for 3 employees. How can I complete this in QB's online?

I'm here to ensure you can include additional information on your employees' W2 form, @lroliver321.

Correcting your employees W2 depends on your payroll service and if the form has already been filed. If we pay and file for you, you’ll need to reach out to our Payroll support team to request a correction.

If you pay and file electronically or manually and need to update the W-2s before you file it, you'll just need to correct the form in your product. Then, file your W-2 forms. However, if you have filed it, you need to manually create and file a W-2c form with the Social Security Administration. For the instructions, please proceed to the General Instructions for Forms W-2c and W-3c section in this article: General Instructions for Forms W-2 and W-3.

Also, for your reference about the process, feel free to visit this link: Fix an incorrect W-2.

You'll want to run payroll reports to easily view your employee data and monitor your business finances in QuickBooks Online. The link will provide you with a list of those reports and an overview of what data they display.

I got your back if you ever need additional assistance in resolving any QuickBooks-related concerns. Please post again here. Have a good one.