@Lynn James You have not mentioned what kind of income you are receiving. It seems like you are saying your son gets SSI. Do you also receive SSI or do you have some other kind of income? If so---what income are you receiving? There are no credits or deductions unless you have taxable income.
And as for the effect on your son's SSI if you claim him as a dependent----that is a question to ask Social Security. We cannot say if his benefits would be affected by being claimed as a dependent.
And.....is he receiving SSI or Social Security? They are not the same thing, but people often mix up those terms. When we are trying to answer a tax question we need to know which one you really have.
WHAT IS THE DIFFERENCE BETWEEN SOCIAL SECURITY BENEFITS AND SSI?
https://www.ssa.gov/ssi/text-over-ussi.htm
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
