Hi. I am needing some advise and do not know who to ask. I work 24 hours a week, I am a single parent to 3. In the 6 wks holidays I have been asked to work full time (40 hrs) for the holidays then back to 24 when kids back to school. I am a shoe fitter and it is our busiest time for back to school kids. Now, I do not know if I should do this as it may mess my tax credits up . Also to add is the extra childcare costs. Would i be paying more in tax and NI? Is it worth doing? I really do not know where to turn or who to ask. Please help. Thank you.