Do I need to file an amended tax return? Please Answer ASAP!?

You claimed nothing of the sort on an I-9. An I-9 is proof of your right to work in the US and has nothing to do with taxation. The only tax form that you typically file with your employer is Form W-4.

You claim withholding allowances on Form W-4 to tell your employer how much tax to withhold. There is no place on it that states you are a dependent or not a dependent. What you put on Form W-4 does not determine how you file your tax return, only how much tax your employer withholds.

If you lived in your parents home for more than half of the year, were under age 19 as of the end of the year or under 24 and a full time student for any part of any 5 months, you are a dependent unless you can prove that you provided more than half of your OWN support. The fair rental value of your parents home (which is going to be substantial if it's adequate for 13 people) as well as a portion of all of the total household expenses enter into the support calculations. Most teens don't come close to providing more than half of their own support even in the year that they move out if it's after July or August.

Conversely, if you were 19 or older at the end of the year and NOT a full-time student for any part of at least 5 months, you are not a dependent if your gross income is more than the personal exemption amount ($3,600 for 2010 and $3,700 for 2011) or if your parents didn't provide more than half of your support. You need to sit down with your parents and a copy of IRS Pub 501 http://www.irs.gov/pub/irs-pdf/p501.pdf and run the numbers in the support worksheet on page 20. Then you both need to review ALL of the rules on claiming dependent exemptions.

One of you will need to amend your 2010 return, but it's not clear from the information that you provided as to who that will be. If you can be claimed as a dependent, you lose your personal exemption even if nobody claims you. If you can't be claimed as a dependent, you can't "allow" anyone to claim you.

IRS Pub 501 explains it all. You and your parents need to read the whole thing and then proceed accordingly.

The support consists of your portion of rent, utilities, home phone, food, clothing, medical, entertainment and transportation if there are 20 other children, your parents and you that would amount to 1/13th of their household expenses if you can prove that you paid your share the 8 months you lived in their house you should not have a problem they have 10 children and two parents x $3700, $44000, and standard deduction of $11600. A total of $56000 not taxable, they really must make a whole lot of money to be worried about one exemption of $3700.

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