Sole proprietorship or corporation ?

I have a candid question that might sound very basic and stupid to a lot of you, please don’t obliterate me.

It’s about creating your company. My husband works in insulation and he has a good relationship with his boss who told him to create his own company to do a partnership with him instead of being just an employee, so I’m doing these papers for him right now.

I read online that there are 2 options : sole proprietorship or corporation. In the first case the company is himself, and all his profits will be taxed at the income tax rate. So between 20-30% depending how much he makes. All good until then.

This is where I’m lost. I read everywhere that for small Canadian business in Ontario (where we live) with a corporation the maximum tax rate is 12% which is pretty good. But for any money he takes out of the company he alsohas to pay either: - income tax and CPP contribution if he pays himself a salary - or a ~15% dividend tax if he pays himself dividends

So I just don’t understand how a corporation is worth it. It just looks to me as if you’re always gonna pay more taxes than with a sole proprietorship. I know I must be missing something here because I also read that it is supposed to be a more interesting option but I don’t understand how?

Thank you so much for hearing with me. Any input from all of you will be immensely appreciated.