Do all of my employees need to redo their W-4 form now that there is a new one in 2020?

Only new hires will have to complete the 2020 version of the W-4.  Existing workers aren't required to complete a new W-4 form until they adjust their withholding. They can leave their 2019 (or prior) forms W-4 and withholding allowances unchanged.

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