I have got a notice of proposed assessment for year 2015, from California. I would like to know more about it.

[Critter]

If you purchased Audit Defense for your tax return, call Tax Resources, Inc. at (877)-829-9695, or report your notice on their web site at http://intuit.taxaudit.com/. Do not contact the IRS. Let Tax Resources contact them for you.

This is the membership email you should have gotten:  https://ttlc.intuit.com/questions/1901569-when-will-i-get-my-audit-defense-membership-kit

Also read the member agreement at this website -https://turbotax.intuit.com/corp/auditdefense.jsp

If you did not purchase Audit Defense:

TurboTax has a special phone number for help with IRS 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/

[xmasbaby0]

No one at TurboTax knows about the letter you got from CA.  The state does not share information with TurboTax after you file your tax return.  What does the letter say?  Read it carefully.  There is likely to be a phone number on it which you could call to ask someone in CA to explain it to you.