If you are using TurboTax Online, the program automatically saves as you progress. You don't have to take additional steps to save your progress. When you log back in, you will be able to pick up where you left off.
If you are using TurboTax Desktop (for Windows) you can click on File at the top left of your TurboTax screen (in the black bar that goes across the top) and then use save or save as to save your return. TurboTax Desktop usually saves files in your Documents in the folder TurboTax.
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