TurboTax retains online tax returns for the current and prior 7 tax years, the same as the IRS.
The IRS only retains tax transcripts for the past 10 years - https://www.irs.gov/individuals/get-transcript
For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf
