Turbo tax.. I have to wait by mail to get my AGI from last year.. Do I have to start my taxes all over, or will it still be there?

When using the TurboTax online editions the tax data you enter is saved automatically.  You can sign off your online account and the data will be there when you return.  Just remember your User ID and Password for the online account.

you should file Form 4868   request for extension.

it may take some time to get a response from IRS.

@jackson_0320 

Yes, your information will still be there when you sign back into your TurboTax account. Make sure your return is saved in your TurboTax account before you sign out. When you sign back in you will be able to continue where you left off on your return.