I recently got my first payment statement for Universal Credit and it awarded me the full standard amount because I don't have savings over £6000 and have not made above the minimum income in the assessment period.
This is based on information I declared and is all truthful, but they did not ask for any proof. So, it makes me wonder how they would know if I or someone else were not to tell the truth.
Also, since I am not employed anymore I did not make any money and that was reported in the statement i.e. 'you have made income of £0.00 in the assessment period" but if I did have a job, how would they find out how much money I was earning? Would HMRC tell them in the form of taxes or would an employer tell them?