How can I find out if someone hacked my turbotax account & changed information on previous tax return such as residence and head of houehold status?

You can check activity in your account.

• Log into your TurboTax account
• Click on Intuit Account in the lower left corner (See the screenshot below)
• Click on the Security tab
• Click View on the Account Activity line.  (See the second screenshot below)

If there was an attempt to log into your account not by you and/or you are concerned about possible fraud we can help you with that.

• Please look at the information below and click on contact us right away.
• This will take you to a Contact page (Please see the third screenshot below)
• Enter your contact information, and in the Additional Notes box, enter an explanation (such as what is written in your question above).

https://ttlc.intuit.com/replies/3301430

Please click here for information on how to change the password and/or set up two-step verification if not already set up.