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If you receive your Social Security Disability benefits based on your earnings - your assets including your IRA saving would not affect your SSD benefits.
You may not - however add funds to your Roth IRA if you do not have any earned income - wages or self-employment income.
If - however all or part of your disability benefits are based on your needs - so called supplemental security income SSI - saving in Roth IRA may reduce your benefits.
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