Alwyn is correct when he says that there is no need to separately file the T4 summary when filing electronically.  The electronic file includes (a) a header that says what you are filing, (b) the T4 slips, and (c) the T4 summary - all in one .xml file.  If you want to reassure yourself of what's there, you can make a copy of the .xml file and open it with your web browser.  (I prefer using a copy, so that I can't accidentally change the real file).  It's a bit ugly looking, but is actually quite easy to read.  Each piece of data has a label telling you what it is - and, near the bottom of the file, you should find the T4 summary.

Thanks to you both. Another question, do you know why I can't select box 40 for an employees RRSP deduction when filing electronically in sage? Do I need to complete any T4s by hand for every employee who is contributing by hand?

Thanks to you both. Another question, do you know why I can't select box 40 for an employees RRSP deduction when filing electronically in sage? Do I need to complete any T4s by hand for every employee who is contributing by hand?