Beginning of tax year I worked part time hours and estimated income was correct. I am now working full time hours and have also worked a lot of overtime and my estimated income has gone up to over £8000 more than previously. This is as of beginning of November. I notified them straight away of the changes. Does this mean I will now need to pay back everything from this year? Will this be asked for as a lump sum or will this be taken back gradually next year. I dont believe I will entitled next year. Thanks for your help, it's a worry.