Hi folks, For a married couple with a single income, I would like to know what is the difference when we W4 is being filled as single. W4 is being filled as Married, with 0 allowances. Do both (1) and (2) withhold the same amount from the paycheck? or (2) by default, results in less amount being withheld (even with 0 allowances) ? Is there any tool that I can use to give me approximate calculations ? please let me know. From the W4 worksheet, Married with single income looks like max allowances possible is 3, with 2 being a safer choice with a possibility of a refund. Thanks.