Just had my renewal pack through, i know it goes on last years earnings but dh got a payment in his wages in March of 3 1/2k, it was a backpayment for for the last 4 years because his company have been re assesing jobs and roles, i didnt inform tc of this because i totally forgot, i know there is a limit in the ammount you can earn before they reduce your payments but dont know how much per year, will they just cancel my TC im not going to get this extra ammount in his salary this year, just a bit confused about the whole tax credit system.