N.J. Stat. § 54A:3-5
A taxpayer who is a "self-employed individual" within the meaning of clause (B) of paragraph (1) of subsection (c) of section 401 of the federal Internal Revenue Code of 1986, 26 U.S.C.s. 401, and a taxpayer treated as such a "self-employed individual" under that section pursuant to section 1372 of the federal Internal Revenue Code of 1986, 26 U.S.C.s. 1372, shall be allowed to deduct from the taxpayer's gross income an amount equal to the amount paid during the taxable year for insurance which constitutes medical care for the taxpayer, the taxpayer's spouse, and dependents; provided however, that the amount of such deduction shall not exceed the taxpayer's "earned income," as defined pursuant to subsection (c) of section 401 of the federal Internal Revenue Code of 1986, 26 U.S.C.s. 401, derived by the taxpayer from the trade or business with respect to which the plan providing the medical care coverage is established, and provided further that no deduction shall be allowed for coverage of any month for which the taxpayer is eligible to participate in any subsidized health plan maintained by any employer of the taxpayer or of the spouse of the taxpayer.
N.J.S. § 54A:3-5