ssi is not taxable. Do you mean Social Security Benefits? ssi is Supplemental Security Income not Social Security.
You pay tax on your total income for the year including Social Security. You can have withholding taken out or not.
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
