Why after submitting proof of union dues am I still owing money on my return

The CRA conducts a number of different types of reviews annually in which the taxpayer must submit some type of documentation to back up or substantiate a credit or deduction they have claimed.

 

When you receive a letter requesting more information or receipts, you usually must respond to that letter within 30 days or request an extension that allows you to gather your information. You can submit your documents via mail, fax, or sign in to your CRA My Account and upload any scanned documents.  Quite often CRA does not receive your documentation in time and they will reassess your tax return and disallow the credit.

 

When this happens, you need to contact them directly. It's best to contact them via the phone number on the review letter you received. If you do not have this number, contact CRA General Enquiries: 1-800-959-8281. It's important that you use the Case/Reference Number from the original letter you received, and if you submitted your documents online you should have a Confirmation Number showing your submission was successful.

 

You should always receive a letter or Notice of Reassessment in regards to your review showing it is complete.

 

• Sometimes the information is not received in time and the reassessment takes place before the documents can be reviewed. This can usually be fixed with a call to them.
• At other times, they may review your information and decide that you do not actually qualify for the claim you were trying to make and "disallow" it. 
• If your documents were received on time and CRA finds them to be acceptable to substantiate the claim, you should receive a letter saying no further action is needed. 

In your particular case, I would suggest you call CRA and enquire with them what the status of your review is.