Hello. I was made redundant in June 2010, but due to long length of service and it being 'voluntary' it was a very generous settlement. The problem is HMRC wrote to me on January 31st this year to say that I had underpaid tax on it by £6,833.60. This was set out with a P800 form. The tax year in question is quoted as year ended 5 April 2011. After speaking to them, they advised I go back to my employer and check with them as to how they based their calculations at the time of my final payment, and to provide breakdowns of this. I have written to them twice now, and have had no reply. Obviously HMRC are keen for a resolution on this. I would therefore be grateful for any advice on how I should proceed. Having re-read my separation agreement, their is a clause in there that absolves my ex-employer from any problems that may arise with regards to PAYE tax claims from HMRC, which pretty much seems to rule out taking up any complaint with them. I am also a bit annoyed that it has taken HMRC this long to get around to notifying me of the problem. I appreciate that at the end of the day the only advice may be that there is nothing I can do other make arrangements with HMRC to pay this amount. If so, please feel free to tell me that! What I would like to know particularly is how I can ensure that they are entitled to this full amount, and if there is any way for me to register a strong complaint over their delay in handling this (a delay which has caused me some frustration, and put me a bit in a hole regarding my current plans).