interest in the partnership which provides the taxpayer with a right to share in partnership capital commensurate with— (i) the amount of capital contributed (determined at the time of receipt of such partnership interest), or (ii) the value of such interest subject to tax under section 83 upon the receipt or vesting of such interest. (5) Third party investor The term third party investor means a person who— (A) holds an interest in the partnership which does not constitute property held in connection with an applicable trade or business