I started my own business in 2012 and have since had an ongoing Tax Credits award. My business has made a loss each year and on completing the TC application form it says in such a case to put down £0 for income, which I did. What isn't made clear, and what I have since discovered is that the actual loss made can be deducted from other income of self and partner, meaning that I would have received a higher award. Can I ask them to reconsider and backdate any underpayment to or is there a time limit, does anyone know?