Filing taxes in Canada is relatively simple compared to the USA. See the site for various options, but try to find ones not operated by American firms such as H&R Block and TurboTax.
From a cursory search, TaxTron, GenuTax, Better Tax appear Canadian. Many are Pay-What-You-Want model.
If you have a complex tax situation and/or can’t file online, and/or don’t want to do the paper return yourself, consider seeing an independent Canadian accountant.
I can vouch for GenuTax, https://www.genutax.ca/Home/About
Positives:
Negatives:
SimpleTax used to encrypt your data they store (if you lose your password, you lose your data). They changed that, then they changed their terms so they can sell your data to partners. Simple tax is now Wealthsimple.
If you decide to use an online or mobile tool, make sure to check if you agree with their terms, and you are comfortable with their security measures.
Personally, this is not the kind of data that I would be comfortable sharing with unknown actors.