An employer that previously maintained a SIMPLE IRA plan is treated as satisfying the 100-employee limitation for the two calendar years immediately following the calendar year for which it last satisfied the 100-employee limitation. However, if the failure to satisfy the 100-employee limitation is due to an acquisition, disposition, or similar transaction involving the employer, then the two-year grace period will apply only in accordance with rules similar to the rules of Internal Revenue Code 410(b)(6)(C)(i).