can filed t4's be reversed

Hello there, Christine. You can’t unfile T4s once they are submitted, but you can correct them. After you file your original information return, you may need to make corrections to slips and file amended or cancelled slips.

You may want to visit these pages from the CRA for guidance:

• Make corrections after filing
• Amending, cancelling, adding, or replacing slips
• Choose the filing method to amend, add, replace, or cancel T4 slips

Should you have any other questions, feel free to leave a message.