snail mail

TurboTax does not mail returns on your behalf. You will have to sign and date your tax forms and send documents such as W-2s that TurboTax does not have. You do not need to be in the U.S. to mail your tax returns.

If you are living overseas and are not enclosing a payment, send your return to:
 

Department of the Treasury
Internal Revenue Service
Austin, TX  73301-0215
USA

If you are living overseas and are sending a payment, send your return to:

Internal Revenue Service

P.O. Box 1303
Charlotte, NC 28201-1303
USA

See: International - Where to File Form 1040 Addresses for Taxpayers and Tax Professionals

Automatic 2-month extension

If you are a U.S. citizen or resident alien residing overseas, or are in the military on duty outside the U.S., on the regular due date of your return, you are allowed an automatic 2-month extension to file your return without requesting an extension.

See: U.S. Citizens and Resident Aliens Abroad

TurboTax has links to state tax websites at How do I track my state refund? You can find state mailing information from your state website.

I read that taxes can be mailed using Private Delivery Service - PDS.  Which PDS's and which of their specific services are IRS approved?  Or, if not using a PDS which other options are IRS approved?

Thank you for the help.  

Please see the IRS list of PDS which includes the services of DHL Express, FedEx, and UPS. The USPS with tracking is also an accepted way to mail returns to the IRS.

@ineed