; and (B) in a subsequent year fails to meet the requirements of such subsection, may continue to teach in such school and shall be eligible for loan forgiveness pursuant to this section such subsequent years. (3) Promissory note conflicts An individual with an outstanding student loan obligation who performs service described in subsection (a)(1) in accordance with this section shall be eligible for forgiveness under this section for such service notwithstanding any contrary provision of the promissory note under which the loan or loans were made. (4) Forgiveness not considered income The amount of a loan, and interest on a loan, which is forgiven under this section shall not be considered income for purposes of the Internal Revenue Code of 1986. (5) No refunds Nothing in this subsection shall be construed to authorize refunding of any repayment of a loan. (6) No double benefit No borrower may, for the same service, receive a benefit under both this section and subtitle D of title I of the National and Community Service Act of 1990 ( 42 U.S.C. 12601 et seq.). (e) Regulations The Secretary is authorized to issue such regulations as may be necessary to carry out this section. (f) Definitions For the purposes of this section— (1) the term year where applied to service as a STEM teacher means academic year as defined by the Secretary