You can file the tax returns, proof of employment, I864 with the other docs. Don't forget the medical
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You should file the I-864 concurrently with the rest of the forms. USCIS will want most recent tax returns and W2 or 1099. Current employment letter/proof of employment will be needed at the time of the interview. Job letter will likely be considered dated if you send it now. Also, keep in mind the interview will probably occur after April 15 (IRS deadline), so if you file now, USCIS will likely want to see 2102 tax returns (and W2 or 1099) at the interview. If you already have them, file the I-864 with 2012 tax returns. If you haven't filed 2012 taxes yet, you can file the I-864 with 2011 tax returns and bring the 2012 with you to the interview.
William M. Cavanaugh Law Office of William M. Cavanaugh www.wmc-law.com (561) 283-2196 This posting does not create an attorney-client relationship and the answer is general in nature. You should contact an experienced Immigration attorney with the specific facts of your case.