The new W-4 form doesn't use allowances anymore, so you no longer claim 0 or 1 or any other number of allowances. The new form works differently. Use the IRS Tax Withholding Estimator at the link that Critter-3 posted above to figure out what to put on your W-4 form. It will show you how to adjust your withholding to get the approximate refund amount that you want.
