You cannot go back and forth from one computer to the other for the same tax return when you are using desktop software, like you can with online software. If you want to use two computers to work on the same tax return (a recipe for confusion) you have to save the return to a device like a flash drive to put the changes into the other computer when you go back and forth.
When you use Online TurboTax, you get one return per fee. Each return needs its own account and user ID. If you use the same account and user ID for a second return, you overwrite the first one and lose it forever.
When you use Desktop TurboTax, which you install from a CD or download to your own hard drive, you can prepare and e-file multiple returns for the cost of the software. You can e-file up to 5 Federal returns—more if you mail the additional ones. If you have multiple returns to prepare for family members, Desktop is more cost effective.
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