I vastly underestimated my income for the last financial year. Thankfully I only claimed FTB A for half the year, but I have been claiming FTB B all year and have to pay it all back. My tax return has gone in today and as I understand it they will work out my overpayment for last year and let me know soonish. However, will they automatically adjust my claims for 2011/2012 based on this year's tax return or will I need to phone them? I have tried to adjust this online but I can't get in to do it and I am keen to avoid phoning them as I know they will be busy at this time of year.