zibi762 said:
We have our official document from we filed as domestic partners at City Hall.
What does this mean? Do you mean the stat declaration of common-law form? There is really no formal step like this required when you become common-law.
Right now you have 2 issues:
1. With CIC. They may question why you are claiming common-law on your PR app, but filed taxes as single. It may not be a big deal, or it may cause them to scrutinize your app more. Nobody can really say for sure.
2. With CRA. By filing taxes as single when you were in fact common-law, you have actually committed tax fraud. I would suggest to do a re-assessment of your taxes for that year as common-law. If you weren't getting any benefits as single that you wouldn't get as common-law, or you aren't claiming your partner in the spouse/common-law amount, then the net difference will be zero. But it's still important to do.