The Charter for Budget Responsibility may include guidance to the Office about how it should perform its duty under section 4, including (in particular) guidance about the time at which it is to prepare any forecast, assessment or analysis required to be prepared under subsection (3) or (4) of that section.

But the Charter must not make provision about the methods by which the Office is to make any such forecast, assessment or analysis.

The Office must, in the performance of its duty under section 4, act consistently with any guidance included in the Charter by virtue of this section.

If the Treasury proposes to modify the guidance included in the Charter by virtue of this section, a draft of the modified guidance must be published at least 28 days before the modified Charter is laid before Parliament under section 1(6).