My wife and I had a nasty surprise a few years back when we way under withheld. We thought claiming "married" and zero deductions would be sufficient. Wasn't even close. Evidently, the typical withholding formula doesn't work so well for relatively high earning dual income couples. So now we withhold extra in addition to no exemptions, and we get a lot back. I know it's stupid to not use a CPA to better ascertain how much to withhold, but it is nice getting a big chunk of change in the spring you're not counting on.