No, you need to send only last year of your tax return. you would have to explain to teh officer why you stayed outside of teh U.S. for more than six months. If it was only one time, four years ago, I do not think it will be a problem.
Elkhalil Law Firm, LLC
Disclaimer: This answer is for informational and educational use only. This answer does not create attorney-client relationship. For more details, I recommend a private consultation with an immigration lawyer.
You should be prepared for the naturalization interview. Make sure you have your tax returns and tax return transcripts for the last five years. USCIS requests your transcripts to make sure that you have filed on time and to make sure that you don't have any unpaid tax obligations. If you don't have this information at the interview, it could delay the naturalization process.
Be sure that you know the exact dates that you were not in the United States as you may be questioned about your absence.
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I agree with Barbara. You should at least have them for the interview, as you never know what the officer may request.
It is better to come prepared for anything then to delay the decision because you did not bring documents that the officer wanted to see.
Marc Taylor, Esq.