My 28 yr-old son gets SSI 4 total & perm disability.I provide >1/2 his supp.He lived with me 4 >1/2 of ‘18.He made 4K frm a job temporarily.What tax benefits r avail 2me?

I believe I can file head of hhld.Is EITC lmt’d by my agi? Will taking any tax benefits effect his SSI status?