How do I open last year's tax return on my Mac?

If you were using TurboTax Online last year, first, make sure you’re in the same TurboTax account as previous years. Then, if you haven’t already, you’ll need to upgrade (if you're in Free Edition) and pay for TurboTax before getting access to your filed return.

Payment instructions:

1. Sign in to your return (past the Take me to my return button).
   (Then, Upgrade in the left-hand menu if you haven’t already done so.)
2. Select File in the left-hand menu and continue until you get to Review your order.
3. Select Start and follow the on-screen instructions to pay for the product you have chosen.

If you paid for TurboTax this year, you can download all of your returns, including prior years, until October 2018. (If you filed with Free Edition this year, you can get your current year return without paying until October.)

To access your current (if available) or prior year return:

1. Sign in to TurboTax using the same login information you used for last year.
2. Go to Your tax returns & documents at the bottom of the main screen (if you're already in your return, select Tax Home in the left-hand menu first).
3. If not already visible, select Show and then the year you're looking for.
4. Now select:

• Download/print return (PDF) to get a PDF copy you can view or print
• Download .tax file to get the data file, which you can open and edit in the TurboTax CD/Download software.

From TurboTax FAQ:
https://ttlc.intuit.com/questions/1900748-how-do-i-get-a-copy-of-a-return-i-filed-in-turbotax-online

 Another option to get your previous year return is through the IRS. More details are available in this FAQ: https://ttlc.intuit.com/questions/1901218-can-i-get-a-copy-of-my-tax-return-from-the-irs