Normally, what gets the withholding closer to the tax liability is for the parent with the highest income to claim the dependents in step 3 on the W4. The other parent should skip steps 3 and 4 on the form W4.
Having said that the most accurate way to complete the new W4 is using the IRS estimator tool. The same rules should apply. Only the parent with the higher income should enter dependent information.
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