After you register your business, you may need to get an employer identification number (EIN) from the IRS. While this is not required for sole proprietorships with no employees, you may want to apply for one anyway to keep your personal and business taxes separate, or simply to save yourself the trouble later if you decide to hire someone else. The IRS has provided a checklist to determine whether you will require an EIN to run your business. If you do need an EIN, you can register online for free.
obrt: ≈ sole proprietorship; several types: slobodni, vezani, and povlašteni obrt (free, tied, and privileged proprietorship registered according to profession; tied and privileged proprietorships are those only master craftsmen can register,) paušalni obrt, obrt-dohodaš, obrt-dobitaš (flat-rate proprietorship, income tax p., profits tax p.; these are registered according to the type of taxation; first two are obligated to pay income tax and the last one is obligated to pay profits tax), sezonski obrt (seasonal proprietorship, that runs for a limited number of months during a year)