A letter from the government agency issuing the pension as to the monthly amount, etc., as well as proof of her US citizenship (either certified copy of her U.S. birth certificate or copy of valid US passport, or copy of Naturalization Certificate, if applicable), as well as her most recent Federal Tax Return (Form 1040).
Behar Intl. Counsel 619.234.5962 Kindly be advised that the answer above is only general in nature cannot be construed as legal advice, given that not enough facts are known. It is your responsibility to retain a lawyer to analyze the facts specific to your particular situation in order to give you specific advice. Specific answers will require cognizance of all pertinent facts about your case. Any answers offered on Avvo are of a general nature only, and are not meant to create an attorney-client relationship.
Tax return and proof of citizenship is usually sufficient.
My answering this question does not form an attorney-client relationship. Always retain a qualified attorney before taking any action. My office offers free consultations.
One note of caution. Make sure that your mom meets 125% of the poverty guidelines when counting the total members in the household PLUS one for an intending immigrant.
Check out this post on I-864 issues:
Dhenu Savla, Esq.
This answer does not create an attorney-client relationship and is not meant to be relied upon as legal advice.
I agree with my colleague that tax return is often sufficient, but if the officer asked for it, then provide it. For the pension, you will need to show some proof of the pension. Your mother probably has documents telling her how much her pension is and for how long she will receive it. Make copies and submit them. If she has no such documents, she should call her former company's HR department and ask for a letter or other document verifying her pension.
You should always consult with an experienced immigration attorney to make certain that the advice you received is appropriate for your particular immigration case.
The tax return and its attachments should suffice to prove her income.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.