For an anecdotal example, when I was in my 20s I worked with an old lady at a fish market who had to strictly regulate the number of hours she worked in a year because she couldn’t afford to make above a certain amount of money. If she went into the next higher tax bracket, she would’ve been kicked off her social security, and regardless of how many hours she worked, wouldn’t be able to make up for the lost money.
Another interesting benefit I’ve heard of from a similar study that gave everybody above a certain age in a town $1,000 a month, but was focused on the impact to the labor pool, was that almost everybody continued to work except for in two categories: pregnant women and high-school students. This coincided with an increase in the average grades of high-school students, the number of kids who graduated, and the number of kids who continued on to college. The theory was that the kids who would normally have to work to help put food on the table were instead able to focus on their studies.