I feel the root cause of this error may be the on the back of the T3 slip issued by institutions. I just read mine and the formula doesn't make sense. It's no wonder the code developed is giving an error message disallowing online submission but pushing us to mail it in. Maybe if Turbo allows users to bypass the errors for boxes 52 and 53 we could submit electronically instead of mailing. A lot of work for footnotes, doesn't even impact the bottom line.
