12 CFR 621.32: Conflicts of interest and rotation.

(a) Conflicts of interest. (1) A Farm Credit institution may not engage a qualified public accountant to conduct the institution's audit if the accountant uses a partner, concurring partner, or lead member in the audit engagement team who was a director, officer or employee of the Farm Credit institution within the past year.

(2) A Farm Credit institution may not make an employment offer to a partner, concurring partner, or lead member serving on the institution's audit engagement team during the audit or within 1 year of the conclusion of the audit engagement.

(b) Rotation. Each institution may engage the same lead and reviewing audit partners of a qualified public accountant to conduct the institution's audit for no more than 5 consecutive years. The institution must then require the lead and reviewing audit partners assigned to the institution's audit team to rotate out of the audit team for 5 years. At the end of 5 years, the institution may again engage the audit services of those lead and reviewing audit partners.