For taxable years beginning after December 31, 1970, section 641 prescribes that the taxes imposed by section 1(d), as amended by the Tax Reform Act of 1969, shall apply to the income of estates or of any kind of property held in trust. For taxable years ending before January 1, 1971, section 641 prescribes that the taxes imposed upon individuals by chapter 1 of the Code apply to the income of estates or of any kind of property held in trust. The rates of tax, the statutory provisions respecting gross income, and, with certain exceptions, the deductions and credits allowed to individuals apply also to estates and trust.