Your new employer needs to know how much money to withhold from your paycheck for federal taxes and is required to remit those accordingly. To determine the withholding use TurboTax's W-4 Withholding Calculator.
Your employer is likely referring to a change the IRS made which replaced the method for determining the amount to withhold beginning in 2020 to reduce the complexity of calculating how much to withhold from each paycheck. This relates to the W-4 as the W-2 is your year end statement of earnings and withholdings.
Here is a link for further details. https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-is-a-w-4-form/L2NapDzX2
Have an amazing day. Evelyn M (CPA 20+ years)
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