<prompt> Human: Hi PF, I just got 2 pieces of mail from the state of CA:1A letter stating that I have taxes due from 2013. I had no prior notice and theres no explanation other than a line item of tax year due and the amount. I checked my return from that year TurboTax PDF and actually had a refund on state taxes that year.2A letter stating that my tax return for this year was intercepted and sent to the IRS... and apparently not applied to this state tax-due, so maybe for something else?So I went to the IRS refund tracker for this year, and see that some of my federal refund was also intercepted diverted to pay a past due IRS obligation. Is this a normal situation? Does it mean they think I messed up on my 2013 return and have adjusted backcharge? How would I should I have found out about this otherwise? I am a bit confused and this situation is frustrating, thank you for any advice.  <response>: Call 1-800-829-1040 M - F 7am - 7pm local time and speak with a representative. They will ask some verification questions and research your federal tax account. Yes, IRS sends notices when they change a tax account to assess a balance due. Depending on how much you owed, seven or more notices addressing the issues at hand would have been sent to your last known address. 