In most states, SSI is not considered income for child support. The exceptions being Illinois and Florida.
To qualify for SSI, you must have limited income and assets. Because of this, most beneficiaries of SSI will be eligible for child support modification, some may not have to pay support at all.
If you are already paying child support, you will need to get the obligation amount changed in state court.
Child support benefits cannot be taken from your SSI amount, or “garnished” in legal terms.