About 4 weeks ago i filled out a ne tax credit form as my partner ha moved in. The tax creds only recieved it this week and said it could take a few weks to sort... Will they backdate my money to the date i changed my claim i.e. The day my partner move in or is it only from the dte tgey recieve it. I am.sure they only back date up to 4 weeks but was unsure from when. Does anyone have any ideas?