Article 7 Calculation of the payments on account
Subject to articles 8, 9 and 10 below, the amount of each payment on account shall equal one twelfth of the total amount of tax, excluding the tax on goods imported from countries other than member States, which the taxable person was liable to pay in respect of the period (in this Order referred to as “the reference period”)—
(a)
1st April 1991 to 31st March 1992 where the taxable person has a prescribed accounting period beginning in October 1992,
(b)
1st May 1991 to 30th April 1992 where the taxable person has a prescribed accounting period beginning in November 1992, and
(c)
1st June 1991 to 31st May 1992 where the taxable person has a prescribed accounting period beginning in December 1992.