As part of the Tax Cuts and Jobs Act, the IRS and Treasury adjusted the tax withholding tables, which affects the amount of income taxes withheld from your pay. For 2020, W4's have been completely redesigned. Exemptions or Allowances are no longer applicable.
My suggestion is to use the IRS Tax Withholding Estimator here. This will help you figure if you need to make estimated payments and the amounts.
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