1. Bill Gates [about.com], age 39. 2. Larry Page [go.com], age 34. 3. Sergey Brin [washingtonpost.com], age 33. 4. Steve Jobs [about.com], 36. 5. Larry Ellison [wikipedia.org], 23, 33, 39, 59 (currently divorced).

As professionals are either of you self employed? This changes how the taxes you owe will appears to you as you will see all the money getting paid and have to do quarterly estimates, etc.

But if you both work jobs where taxes are automatically deducted from a pay check, simply choosing one for the number of dependents for both of you should put you right where you need to be.

You do still get screwed over if you own a home because if you were living together but not married you could file separately and do a itemized deduction on one of your taxes, and tax a standard deduction on the other. You can't do that when you're married.