There are more perverse options with housing, childcare and income benefits being removed which I believe can lead to a negative income.
In the US the Benefit Cliff is real:
"There is this issue of the benefits cliffs, where some programs are designed so just a very marginal increase in earnings can result in a loss of a very important benefit. And a lot of states, unfortunately, have structured their childcare subsidies programs that way," explains Skinner.
"Typically, pay rises, income rises, but at some point you lose eligibility for a subsidies all together and it's an abrupt reduction in that family's resources," Skinner says.
https://www.theguardian.com/money/2014/jul/20/benefits-cliff...