Overtime help

[FREYASMUMMY2015]

Hi I am a single mum I work 30 hours a week and I currently get child tax and working tax but with the debt I have been left with when my LO dad left I just don't earn enough and I am really struggling. I am looking into working over time but I know I have to be awful BecuSe I am on tax credits does anyone know how many more hours o
Can do before it becomes an issue with tax credits I am only talking like 1/2 extra shift a month.

Thank you