Ok I worked on the tax credit "helpline" for a year. Any dispute form goes into an ENOURMOUS que and is dealt with in dte order. Last time i worked on that department it was 6 months behind and they are dealt with in date order.
the training the staff get was supposed to be 3 months but now you get a 3 week course. We have NO way of contacting the actual tax credit office. The estimates you are given over the phone are from software tht is broken daily and is often totally out of whack (i used to calculate my own based on my salary and it was different everyday) I would advise Anyone claiming to get a claim form and claim it rather than getting an estimate over the phone or have someone tell you your not entitled.
As far as overpayments go so many are being disputed now and with the problems they have had alot are being written off. If you are persistent you can get it written off but it takes time and red tape.
They managed to overpay me by £300. They paid my Salary.
I now work on the PAYE desk so any tax issues anyone may have i can try and help

Self assesment and what not i have to do them every day :"( or i did before lil one
