I was using UFile for several years, it's fine in general, but if you try to submit your taxes on April 30th - forget it, it's slow and crashing all the time. Also it seems running on outdated Microsoft web server with some documentation missing for some fields returning 404 error.I probably should try other solution next year.
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Prepare Canadian federal and Quebec tax returns online and file them electronically to the CCRA and to the MRQ via Netfile.