Taxed to each partner at individual rate. Taxed at individual rates unless IRS rules LLC is a corporation. Yes, except on reasonable compensation paid to owners employed by the corporation. No, depending on IRS ruling. Limited Partners, in most cases, limited to amount invested.
Corporation deducts losses.
Yes, for federal taxes. Yes, in general, if IRS treats as partnership. Same as corporation if IRS treats as corporation. Social Security Taxes on Owner's Earnings Full amount, one-half of which may be deducted on income tax form. Same as Proprietor.