President Obama’s expansion of overtime pay goes into effect on December 1. But what happens if it gets rolled back in 2017? Here are some of the Department of Labor’s takeaways from a Congressional Budget Office report:

1. CBO finds that reversing the rule would strip nearly 4 million workers of overtime protections. According to the report, there are nearly 4 million workers whose employers will be required to pay them overtime when they work more than 40 hours a week when the rule goes into effect.
2. CBO finds that reversing the rule would reduce workers’ earnings while increasing the hours they work. The report finds that if the rule is reversed, the total annual earnings of all affected workers would decrease by more than $500 million in 2017. Further, these workers would earn less money while working more hours.
3. At a time when income inequality is already of great concern, CBO finds that reversing the rule would primarily benefit people with high incomes. If the rule were reversed, affected workers, most of whom have moderate incomes, would experience a loss in earnings. These losses would be accompanied by an increase in firms’ profits, of which the vast majority (CBO estimates 85 percent) would accrue to people in the top income quintile.
4. CBO finds that reversing the rule would not create or save jobs. The report finds no significant impact on the number of jobs in the economy.

Nearly 4 million workers.

Laura Clawson is a Daily Kos contributing editor since December 2006. Labor editor since 2011.