If you are doing a spousal return which is 2 returns being done at the same time, you would pay the price of 2 returns. Depending on the software you are using it will be that amount times 2. It seems you used the free version last year and if any of these below have changed, you were upgraded to a higher version.
There might be donations in box 46 of your T4 or Employee-paid premiums (medical) in box 85 of your T4 which would require an upgrade to allow you to claim additional credits not included in the free version. Please see the list below enumerating what is or is not included in the free version.