Nonprofit 501c3 refers to the U.S. Internal Revenue Code (IRC) and a specific tax category for nonprofit organizations which is under section 501(c)(3). To start a non-profit law firm you need to hire skilled manpower to assist you. You’ll need someone to draft documents and file forms for you. You’ll also need someone to help you with your legal questions. Public charities, foundations, social advocacy groups, and trade organizations are mainly four types of nonprofit organizations. The profit earned from all these institutions is not distributed to shareholders or owners. Any religious organization such as mosques, or churches, or synagogues, and other places of worship are listed in nonprofit organizations. They are automatically considered tax-exempt by the IRS.