How do I access tax returns from 2006 to 2010?

The IRS site below has information on obtaining a transcript and also a photocopy of your return.

https://www.irs.gov/individuals/get-transcript

Thank you.  But, they only have the current, and last 3 years available.

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@elisehogan wrote:

Thank you.  But, they only have the current, and last 3 years available.

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Tax return and tax account transcripts are also limited to the current and prior three tax years when using Get Transcript by Mail. However, you may be able to get older tax account transcripts by calling our automated phone transcript service at 800-908-9946. Otherwise, you must submit Form 4506-T.