Whether it affects your social security depends what type of social security you are receiving. If you are getting SSI then yes. Otherwise no.
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You will need to report the winnings as income. It is likely some of the money has or will be withheld from the winnings for the anticipated taxes. Whether this will affect your social security and medicare benefits depends on your exact situation. You should personally consult with an elder law attorney for advice specific to your situation.
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Social Security and Supplemental Security Income (SSI) are two different things. Many confuse the two due to the name similarity and because both programs are managed by the Social Security Administration. Social Security and Medicare are insurance programs (unlike SSI and Medicaid which are means-tested welfare programs). You can be a millionaire and receive the full Social Security and Medicare benefits for which your premiums have paid.
For tax reporting advice, you should consult with a tax accountant or IRS enrolled agent.
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