I got a letter stating I got audited and now owe $663. I never got notice I was being audited. I had an easy, one w2 filing. What do I do and how did this happen?

[Anonymous]

we can not see your return or the letter. is the letter legit? 

if you paid for Audit Defense, you should contact them if not for a fee you can contact them to look into the matter

The Audit Defense service is provided by TaxResources, Inc., also called TaxAudit.com, in partnership with TurboTax. If you paid for Audit Defense and you received an IRS notice, call TaxResources, Inc. at 877-829-9695, or report your IRS notice on their web site at http://intuit.taxaudit.com/. Do not contact the IRS until you have spoken to TaxResources. They may contact the IRS on your behalf.

if you don't have AD and do not want to pay for their services you can call the IRS

Rather than calling the number in the letter which will be fake if the letter is not legit, call 800-829-1040

First choose your language.
Then 2
Then 1
Then 3
Then 2
You should then be transferred to an agent, but could be put on hold.  The agent will be able to tell you if the letter is legit and if so, what the IRS changed.  

another way to check would be to go to irs website

https://www.irs.gov/ 

and use view your account or get your tax record which will have a transcript of your return.  the transcript will show on some lines what was reported and right below that a line ending with "per computer" - what the IRS says is correct 

[xmasbaby0]

TurboTax does not receive any information from the IRS or your state after your return was filed, so no one at TurboTax knows about a letter you received from the IRS or the state.

(what the letters from the IRS mean)

I GOT A LETTER FROM THE IRS   

https://ttlc.intuit.com/questions/3605673-i-got-a-letter-or-notice-from-the-irs

I AM BEING AUDITED

If you purchased Audit Defense:

https://ttlc.intuit.com/questions/2924451-i-bought-max-or-audit-defense-and-now-i-m-being-audited

AUDIT SUPPORT

TurboTax has a special phone number for help with IRS/state tax letters, which will be easier than going through regular Customer Support.   At the page below, click on the blue button that says "Get Help from TurboTax Support".  Then it will ask you what tax year is your letter.  Then it will ask you what the letter concerns. Then it will show you the phone number during posted business hours.

https://support.turbotax.intuit.com/irs-notice/audit-support/