A particular type of occupational pension scheme that was widely used by owner-managed businesses before pensions tax simplification came into effect on 6 April 2006. Under regulation 2(1) of the Retirement Benefit Schemes (Restrictions on Discretion to Approve) (Small Self-administered Schemes) Regulations 1991 (SI 1991/1614) (now revoked), a SSAS had to have fewer than 12 members if at least one of those members was connected with another member or an employer or trustee. A SSAS also required a pensioneer trustee. Since 6 April 2006, a SSAS counts as a registered pension scheme, and the requirement for a pensioneer trustee no longer exists, although there are special provisions relating to schemes with fewer than 12 members.