You’ll usually need proof of identity, your National Insurance number, bank or building society details, and information about your rent, earnings, savings and other income. If relevant, you may also need details of childcare costs, your partner and children, or a health condition. You can start a claim online even if you do not have every document ready, but the Department for Work and Pensions may ask for evidence later. Check your online account and journal, or the official GOV.UK Universal Credit guidance, for what applies to your circumstances.