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I am afraid that he cannot work under some other party's DBA. He can switch the company over to his name, since he purchased the company and he would have to obtain his own EIN number from the IRS and file taxes under his own EIN.
If he had a contract
with the former owner, even a verbal contract, then both your son and the former owner must honor that contract I am afraid, which means your son has to pay his bills and if he does not the owner can shut him down and can sue your son for all money he owes.
Your son has an option of filing for bankruptcy
, which would extinguish those debts to the former owner and everyone else he owes. If your son does not file for bankruptcy for whatever reason, his only other option I am afraid is to negotiate some deal with the former owner or come up with some investors in his business who can put up some money for a share of any profits when he finally starts to make money. These are his options.
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