Can anyone help me with my tax credits for 2012/2013. I'm a single parent working 40hrs per week and my annaul income is £18,000 before tax. I do not have any child care costs as my mother looks after my son. I'm concerened about the changes to tax credit as currently I only have about £150 left from my wages plus my TC each month after I have paid my rent and bills etc. I'm not sure if this makes a difference but I don't receive any child maintence payments.