Hoping that someone may be able to help me out as i am completely Confused lol. My tax credits claim was checked last year and wasn't processed until dec. Tax credits said to issue me with an award they would need to estimate my earnings for 2013/2014. They came up with 15000. I have now recieved my p60 and the actual fugure is 3000. I called them up in feb to try and make them aware of this and.my payments went up by 8 pound a week. Will i be due a lump sum when i renew? Any opinions would be greatly appreciated. Thanks