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The U.S. Internal Revenue Code (IRC) requires the Social Security Administration (SSA) to withhold nonresident alien tax from certain Social Security monthly benefits. If you are a nonresident alien receiving retirement, disability or survivors benefits, SSA will withhold a 30 percent flat tax from 85 percent of those benefits unless you qualify for a tax treaty benefit. This results in a withholding of 25.5 percent of your monthly benefit amount.
However - your ACTUAL tax liability is determined on your tax return - and specifically is based the country where you are a resident.
As you might know - there is a tax treaty in effect between th US and Mexico
Here is the document - see page 21
ARTICLE 19Pensions, Annuities, Alimony, and Child Support1. Subject to the provisions of Article 20 (Government Service):b) social security benefits and other public pensions paid by a Contracting State to a resident of the other Contracting State or a citizen of the United States shall be taxable only in the first-mentioned State.
Thus your social security benefits are taxed in the US only and not taxable in Mexico.
Under the US tax law - 85% of the U.S. social security and equivalent railroad retirement benefits you received are taxable. This amountis treated as U.S. source income not effectively connected with a U.S. trade or business. It is subject to the 30% flat tax rate.
Thus - based on your information - you are NOT entitled fro any refund.
Your tax liability is exact the same as your withholding. Filing your tax return would not make any difference.
Sorry if you expected differently.