Paragraph 19 I1

“tax month” means the period beginning on the 6th day of a calendar month and ending on the 5th day of the following calendar month, and

“tax week” means 6th April to 12th April (inclusive) and each successive period of 7 days, except that the final tax week in a tax year is just the last day of the tax year (or last 2 days in a leap year).