In many cases, people would see only a small increase in income by working full-time, and in some situations, they could actually end up worse off.
This also relies on the very unrealistic assumption that people currently considered unable to work can suddenly take on a full-time job. For many, part-time work is a more realistic option than full-time employment. But moving into part-time work is more likely to result in a loss of income, and the financial impact is typically much greater.
For example:
a single claimant losing PIP daily living and universal credit health would be £114 per month worse off if they worked full-time, and £359 per month worse off if they worked part-time for 20 hours per week.
a couple claimant where one partner loses PIP daily living and universal credit health, while the other remains in full-time employment, would only gain £112 a month if the partner that lost their benefits worked full-time. And they would be £272 per month worse off if the partner worked part-time for 20 hours per week.