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Depending on the number of slips you are filing, choose from these options.

T4 Web forms You can file 1 to 3 T4 slips	T4 Desktop application You can file 1 to 70 T4 slips
Internet file transfer (XML) If you use prepared payroll, commercial, or in-house developed software, you can submit files of up to 150 MB in XML format	Filing electronically If your file is more than 150 MB, you can either compress your return or you can divide it so that each submission is no more than 150 MB
Amending returns There are several ways to amend your return (cancelling or amending slips) after you have filed.	My Business Account You can file a return through T4 Web forms or Internet file transfer (XML) (up to 3.5 MB), check a return's status, view your account balance and transactions, and more.
Need to retrieve your Web access code?

Videocast: T4 Web Forms and T4 Desktop Application (FLV, 9.3 MB)
Watch a video to find out how you can create your original or amended T4 information return for up to 70 employees with the CRA's free software. (Transcript and Videocast help)