My 18 yr old son still live at home and work part of the year can I still claim him as a dependent and does he file separately or with me

You can still claim your 18-year-old son as a dependent if he did not provide more than half of his own support in 2018.

You do not report your son's income on your tax return.

He has to file his own tax return and indicate in the My Info section of TurboTax that he can be claimed as a dependent by someone else.