I'm a single mum and I currently get working tax credit and child tax credit working 30 hours a week. I did a quick calculation on line to see if I would be better off on universal credit and all it says if 'you could be better off' not 'you will be better off' !! I'm scared to move over in case I find that I'm worse off than before. Has anyone else been in this situation? Don't the tax credits people work it out for you before they change you over ? Also how do I change over if I choose to ? Sorry for all the questions.