what happens if you've changed your name (ie got married) It's just occured to me, while filling in an application form, that my NI card is still in my maiden name. I get my tax credits, and child benefit in my married name, so obviously they've got my NI number - are you supposed to apply for a new card with the correct name on, or would it just "show up" on the system when they check for your details that you are now who you say you are?