Certainly. The amount of money it costs a Canadian pension couple to have widely unequal incomes can easily equal their property taxes. In my case, for example, the amount of money I pay in income tax yearly compared to any other couple of the same total household income, simply because my wife and I have widely different pension incomes, is equal to my property taxes of $2,400.
The largest percentage that unequal-income pension couples pay extra in income tax is about 45% to 46%, and that's in the $32,000 household income range. In other words, where spouses are getting $21,000 and $11,000 respectively, that couple is paying about $600 more income tax yearly than a couple of the same household income who are getting $16,000 each.