The new W-4 form for 2020 and later doesn't use allowances anymore, so you no longer "claim 0 allowances" or any other number of allowances. The new form works differently. Use the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 forms. It will let you adjust your withholding to get the approximate refund amount that you want.
Tax Withholding Estimator
