Sorry, those were supposed to be "not equal" signs. In other words, each is taxed differently. Interesting exercise - take a tax form (or software) - enter usual income and deductions. Add some interest income, see what it does to your tax owing. Take it out, add the same amount of capital gains. This is hard to do with dividends unless you actually have some, because they play games with it to account for corporate taxes already paid. But interesting, because total income on different lines affects credits.
Renting versus owning in Canada, tax-wise. I think there was something on here at one point. Maybe one of Frugal Toque's guest blogs? And this is one reason American personal finance books should not be read by Canadians, unless they really know the Canadian situation already. Capital gains and losses on a principle residence are not part of your income tax - make money, how nice, lose money, too bad. Secondary residences (i.e. a cottage) are treated like any other investment. No benefits on the mortgage interest, since it is not for investment purposes. Unless you take out a new mortgage to buy an investment, then the mortgage loan was for an investment and the interest is an investment deduction. But if you had to liquidate an investment to do the original mortgage, you will have capital gains to pay tax on (unless you liquidated them because they were losses and good to get out of).
Own versus rent - To me the one thing that can affect us is, that you are paying your mortgage or rent with after-tax dollars. So say you suddenly have a chunk of money - you can pay off some or all of your mortgage, or invest it. Most of the discussion here is about the relative yield - mortgage at 4% say, versus an investment at 7%, and they say go for the investment. But to me (this is my personal opinion, not an expert's) you need to look at that investment income in terms of its after-tax value, at your highest marginal rate (because it will be new income on top of what you already have). So if you are in Ontario, normally make $100,000 (for simplicity) you are at the marginal tax rate of 26%. Then in Ontario you are at 11.16%. So your total tax on $5000 of extra income would be 5000*(.026+.1116) = $1858. Your original chunk of money was $71428 because 7% of that is $5000. How much money will you save this year on your mortgage interest if you put this on your mortgage? And of course the same scenario happens every year. Then if you cash in that investment, you will possibly have capital gains that will be taxed as well.
So from that logic, having a chunk of money and investing it is going to be the same whether you are renting or owning, your tax implications don't change. The only thing that changes the situation is putting potential investment money towards your mortgage, which means it is in a very not-liquid asset. And this is ignoring the fact that when you do come to sell that house, you may end up with a net positive or negative result.
Sorry this was so long, you can see why mortgage versus investment generates whole threads. But it is a really country-specific and income and tax level specific topic.
#6. ... Interest =/= dividend =/= capital gains though, figure out which is best for you.
I'm a little unclear about #6. I guess the signs threw me off. Are you saying that the interest I receive from the bank and/or dividends from my portfolio are all considered capital gains?
Side question: Do you get any tax benefit if you own a home vs. renting in Canada?