taxes imposed on the trust
(1) In general The term “taxes imposed on the trust” means the amount of the taxes which are imposed for any taxable year of the trust under this chapter (without regard to this subpart or part IV of subchapter A) and which, under regulations prescribed by the Secretary, are properly allocable to the undistributed portions of distributable net income and gains in excess of losses from sales or exchanges of capital assets. The amount determined in the preceding sentence shall be reduced by any amount of such taxes deemed distributed under section 666(b) and (c) to any beneficiary.