Social Security Questions? Ask a Social Security Expert
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Per the SSA information
If you need proof you get Social Security benefits, Supplemental Security (SSI) Income or Medicare, you can request a benefit verification letter online by using your my Social Security account.
This letter is sometimes called a "budget letter," a "benefits letter," a "proof of income letter," or a "proof of award letter."
To set up or use your account to get a benefit verification letter, go to the following SSA page
You can create an account then make your request for the letter your bank needs.
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I am checking back to see if you were able to create that account on SSA page and request your statement.