TurboTax Premier is a good choice for people with rental income and expenses.

If you choose to prepare your return with your spouse, you'll actually be preparing 2 returns at the same time. When it's time to pay, you'll be charged for Premier ($39.99) + one spouse return (which is always just $19.99).

If you're considering purchasing a prepayment code as part of an email promotion, you'll need the 2-return option.

I did purchase a prepaid premier (single return), only to realize there was another option for spousal returns right after. Would I be able to use my prepaid code, and pay for spousal return separately? Alternatively, is there a way to switch to the second option (with spousal return) and pay the difference now?

Yes, if use the code you purchased, TurboTax will take off the price of your return and just charge you the balance ($19.99). Alternatively, you could give us a call and exchange your 1-return code for a 2-return code. Here's how to reach us by phone: https://turbotax.community.intuit.ca/replies/3152013