by dutchman » Thu Sep 14, 2017 5:50 pm
It's so people are eventually forced to pay any cash savings they have into the bank. The bank informs HM Revenue and the DWP of any large cash deposits, they in turn then investigate the saver for having possible undeclared earnings or undeclared savings. It doesn't have to be a huge amount, just enough to tip someone over the earnings or savings limit.