The USAA site will allow you to sign in and access the discounted rate for Turbo Tax.
You can check out all the FAQ for this at this website, https://www.usaa.com/inet/wc/advice-tax-center?showtab=turbotax
USAA provides a number to call regarding any discounts for TurboTax. It's 800-531-6347
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And when you access TTX thru that USAA website, it takes you to the "Online" software selection page. Don't login there if you want to use the Desktop/Download product. select the pulldown menu and go to the CD/Download page to select and purchase the download (don't get the CD, get the download)...as shown below:......... (and the discount is "Up-to" $20.....$10 Deluxe, $15 Premier, $20 H&B )