brisanje preduzetnika

1. closing a sole proprietorship; deregistration of a sole trader
   Predala sam registracionu prijavu za brisanje preduzetnika u APR-u. — I submitted the application to deregister my sole proprietorship at the APR.
   Pre brisanja preduzetnika proveri da li imaš poreske dugove. — Before closing your sole proprietorship, check whether you owe any taxes.

In speech people more often say zatvoriti radnju / zatvaranje firme.