Federal Tax Withholding 2020

We update the Federal tax table prior to the first payroll of 2020 using the rates from www.irs.org.  On Friday 02/28/2020, we applied tax update
20A.  Employees that updated W4 for 2020 and compare check from before 20A applied to the check after 20A are seeing a
decrease in the withholding amount for the same taxable gross.  When I calculate, what the withholding should be using the worksheet, we think that before 20A the calculation was not using the employee’s marital status. 

Has anybody had this issue?

Thanks,

Esperanza Torres