Filing Information Returns Electronically (T4/T5 and other types of returns) – How to amend

  1. Overview
  2. What you should know before
  3. How to file
  4. How to amend

4. How to amend

After you file your information return, you may notice that you made an error when preparing the slips. To correct these errors you will have to file amended or cancelled slips.

You can file amended or cancelled slips electronically using the Internet file transfer or Web Forms applications.

Amending or cancelling slips using the Internet file transfer application

When you are filing amended slips

  • include only the slips that need to be amended
  • use the report type code “A” on the summary and slips
  • enter all data that has not changed for the slip and make changes to fields that require corrections
  • include only the totals from the amended slips on the amended summary

When you are filing cancelled slips

  • include only the slips that need to be cancelled
  • use the report type code “A” on the summary
  • use report type code “C” on the slips
  • enter all data that was on the original slip
  • include only the totals from the amended slips on the amended summary

Start Internet file transfer (XML)

Amending returns using the Web Forms application

Start a new Amendment

  • select the amended  option
  • input information for only the slips that need to be amended
  • enter all data that has not changed for the slip and make changes to fields that require corrections
  • cancel slips by entering the exact data you had previously reported and choose the cancel option
  • review the amended summary that Web Forms creates for you
  • submit your return

Importing a submission that was previously filed using Web Forms

If you have saved a return that was filed using Web Forms you can import it to create your amendment.

When you are filing amended slips

  • import the original file
  • select the amending slips option
  • choose the slips you want to amend
  • remove the slips that do not require amending
  • correct the information or financial fields that require corrections
  • review the amended summary that Web Forms creates for you
  • submit your return

When you are filing cancelled slips

  • import the original file
  • select the “cancelling slips” option
  • choose the slips you want to cancel
  • remove the slips that do not require cancelling
  • keep the information that is on the slip
  • review the amended summary that Web Forms creates for you
  • submit your return

Start Web Forms

Cancelling an entire return you have filed using the Internet File Transfer or Web Forms applications

To cancel an entire return, mail or fax your request to your Tax Centre, to the attention of Employer Services.

To find your Tax Centre, see Tax services offices and tax centers - Addresses, office hours, and fax numbers.

Filing Additional slips

If you need to send additional slips after you have filed your information return. You must send a new original return.

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