Yes. While it may be best to keep most finances separate in the early stage of a relationship, it makes sense to pay jointly for some household expenses and even other lifestyle expenses like travel. In a financial planning perspective, it is easier, more convenient and it offers some advantage at tax time as well. Overtime, if you see your relationship evolve and feel that you truly are a “team” for the long-term, joining all finances with the exemption of weekly allowance, make sense.

Here an article written on the subject.

http://www.theglobeandmail.com/globe-investor/personal-finance/household-finances/should-we-open-a-joint-bank-account/article2367925/