How to amend a T4?

Hello cornwallis82,

Welcome to Community!   QuickBooks Online Payroll, is a dynamic way to pay your staff with confidence.  I can understand that some circumstances require attention, and adjustments to T4 slips may be required. I would be glad to assist!

Although there isn't a way to edit the forms in QuickBooks Online, you can amend them on the CRA website. Once completed you'll have the option to print or download them, for your records.  

If you have any other questions, feel free to reach back out.  We would be happy to help!