Gather recent bank statements, payslips or benefit statements, and details of regular income. Include household bills such as rent or mortgage, council tax, utilities, insurance, childcare, travel and subscriptions. Add statements for credit cards, loans and other debts, plus records of less frequent costs such as car repairs, annual memberships and school expenses. If you cannot find everything, estimate initially and replace figures with accurate amounts when you can; bank statements and bills can help check your entries.