You’ll usually need your National Insurance number, bank or building society details and the date you want your State Pension to begin. It may also help to have details of any time you have lived or worked abroad, your most recent marriage or civil partnership, and benefits you receive. You normally do not need to send original documents unless the Department for Work and Pensions asks for evidence, such as proof of identity. Check the latest requirements and claim options on GOV.UK, as the documents needed can depend on your circumstances.