i had my 2006 taxes prepaird by my tax man. the gov. sent a form saying i left out taxable income. whos falt?

I know this has been answered twice already, but I feel there's more to be said. As VB pointed out, the standard practice is for the preparer to pay any penalty or interest if the error is his or her fault. Now if the preparer failed to ask you about other income, or after asking about it, neglected to include it on the return, it's preparer negligence. You still owe the tax, for the reasons the other answerers pointed out. On the other hand, if the preparer did ask you about other income and you failed to inform him, intentionally or not, you are ultimately responsible. Very few preparers, in my experience, make this clear. My advice, don't use any "store front" preparers such as H&R Block, Jackson Hewitt, or Liberty. Ive worked for all of them and found that few of their seasonal preparers are adequately trained.

Both of you are at fault. Who signed your tax returns? Read the statement above the signature line on the tax forms.

I seriously doubt you had provided your tax man all your tax information. Your are responsible because was your obligation to review the return for an errors before signing and sending it to IRS.

Does it matter whose fault? Just fix pay what you owe.

If you really need to assess blame for some reason, look at the bottom of the form to see whose signature is below the part that says "Under penalties of perjury, I declare that I have examined this return and accompanying schedules and statements, and to the best of my knowledge and belief, they are true, correct, and complete." It is yours!!

At best you could ask him to pay any penalties you owe--which he'll promptly ask the IRS to waive.

As the first poster said, it's your money and your tax return. So it's your tax liability. If you failed to catch it when you reviewed the return, it's your fault too.