(

a) The provisions of Sections 811(c)(4), 811(c)(6), and 811(c)(7) of Public Law 99-514, as modified by

Section 1008(

f) of Public Law 100-647, shall apply. (

b) The provisions of

Section of Public Law 99-514, relating to the disallowance of use of installment method for certain obligations as modified by

Section 1008(

g) of Public Law 100-647, shall apply to taxable years beginning on or after January 1, 1987. (

c) The repeal of

Section 453C of the Internal Revenue Code by

Section 10202(

a) of Public Law 100-203, relating to repeal of the proportionate disallowance of the installment method, shall apply to dispositions in taxable years beginning on or after January 1, 1990. (d)

(1) In the case of any installment obligation to which

Section 453( l )(2)(

B) of the Internal Revenue Code applies, in lieu of the provisions of

Section 453( l )(3)(

A) of the Internal Revenue Code, the tax imposed under

Section or for any taxable year for which payment is received on that obligation shall be increased by the amount of interest determined in the manner provided under

Section 453( l )(3)(

B) of the Internal Revenue Code.

(2) The provisions of Sections and of Public Law 100-203 are modified to provide for each of the following: (

A) The provisions of

Section shall apply to dispositions in taxable years beginning on or after January 1, 1990. (

B) The provisions of

Section shall apply to costs incurred in taxable years beginning on or after January 1, 1990. (

C) Any adjustments required by

Section of the Internal Revenue Code shall be included in gross income as follows: (

i) Fifty percent in the first taxable year beginning on or after January 1, 1990. (ii) Fifty percent in the second taxable year beginning on or after January 1, 1990. (e)

(1) In the case of any installment obligation to which

Section 453A of the Internal Revenue Code applies and which is outstanding as of the close of the taxable year, in lieu of the provisions of

Section 453A(c)(1) of the Internal Revenue Code, the tax imposed by

Section or for the taxable year shall be increased by the amount of interest determined in the manner provided under

Section 453A(c)(2) of the Internal Revenue Code.

(2) The provisions of

Section 453A(c)(3)(

B) of the Internal Revenue Code, relating to the maximum rate used in calculating the deferred tax liability, are modified to refer to the maximum rate of tax imposed under

Section in lieu of the maximum rate of tax imposed under

Section or of the Internal Revenue Code.