You should hold on to any bank statements and credit card statements that show your balance as at the end of your financial year (for most people this will be 31 March).
A screen shot of your bank account on balance date will do, but for credit cards we will need a copy of your statement. If your credit card has no statement on that date, please provide the first available directly following the end of your financial year.
If you have any loans, you'll also need to provide a loan statement, which you can find out more about here.
If you're a RightWay customer have any questions you can contact your RightWay accountant, email email@example.com or call 0800 555 024