I just discovered that the SSN my employer has for me is incorrect. The last digit in my SSN is and "8" and they show it as a "0". I have already filed my 2004 and 2005 returns. I did not notice the error and filled out the returns with my correct SSN, but attached the W2 showing the incorrect SSN. I was never informed by the IRS that there was a conflict.

I have not yet filed my 2006 return. What should I do?

Your IRS obviously know its you and have the correct number. Did you inform your employer of the correction? Just file your tax return with your SSN as usual. It will all correct itself, unless you want to inform the IRS of the mistake, but how many times will you have to call to do this ? :)

Have you had your 2006 W2 from your employer yet? If your number is still incorrect on it, just correct it.

Agree with Tickle; the IRS probably corrected it and, for some reason, neglected to tell you.