A DBA is just a name under which your son can do business. Registering it in the state of Texas means no one else can call their business the same name in Texas. It has nothing to do with his federal taxes. He needs to register as a corporation or partnership or something to effect his federal taxes.
Here is an FAQ for registering a DBA in Texas. The filing fee is $25. Here is the form to file.
And, again, none of this has anything to do with his federal tax return.
@trberkovich
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