It is important to ask yourself questions and even more important to answer on them sincerely. What is your long-term company vision? Try to project your goals and connect them with the form of the company to whom gravitate.
For income tax from self-employment (samostalne delatnosti) all adult household members of the main household are potential taxpayers and guarantees of the business. (Zakon o porezu na dohodak građana, član 157)