You can make a self-assessment using on-line tools recommended by the government. These can help you work out if you are entitled to benefit, how much you will get and how much better off you would be if you took on some extra paid work - https://www.gov.uk/benefits-calculators

Aster staff use the Policy in Practice tool and if you want help using this do phone our contact centre and ask to speak to a benefits advisor or your Customer Accounts Team.