Tax Preparation Tip #4: Withhold way more than you need to. This is a two-fer. It ensures that you will get a nice, fat refund after your interest free loan to the Government (See Tip #2 for the benefits of not earning interest) for you and the spouse to spend (See Ancillary Tip #2b), and it will ensure that you do not have to make estimated payments for the next year.
Uncle Sugar likes his crack cocaine, and isn't willing to wait a year for it. Not only will you have to write a check every three months, but you will also get to fill out yet another form detailing that you did. That's a lose-lose situation if I ever saw one. Better to let the Uncle spend your excess withholding, then go further in debt paying you back at the end of the year. It's the PayDay Loans model of governance!