You can prepare as many returns as you want with the CD/Download version of TurboTax. It's just that you can only e-file five returns. The rest can be printed and mailed.
You would have to buy another TurboTax product, with a different email address, to file five (5) additional income tax returns. However, you could file as many paper returns as you like and mail them in.
If you want to use any of the "pro" tax software you will need an Electronic Filing Identification Number (EFIN) in order to efile any returns.
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