employees employed in connection with an unrelated trade or business. The determination that the plan is not a church plan will apply to the second year (within a 5 year period) for which the plan fails to meet paragraph (b)(2)(ii) (A) or (B) (if applicable) and to all plan years thereafter unless, taking into consideration all of the facts and circumstances as described in paragraph (b)(2)(iii) of this section, the plan is still considered to be a church plan. A plan that has not completed 5 plan years ending after September 2, 1974, shall be considered maintained primarily for the benefit of employees not employed in connection with an unrelated trade or business unless it fails to meet paragraphs (b)(2)(ii) (A) and (B) in at least 2 such plan years.
Thus, if with respect to a single employer the plan fails to meet any provision of this paragraph, the entire plan ceases to be a church plan unless that employer ceases maintaining the plan for all plan years beginning after the plan year in which it receives a final notification from the Internal Revenue Service that it does not meet the provisions of this paragraph. If the employer does cease maintaining the plan in accordance with this paragraph, the fact that the employer formerly did maintain the plan will not prevent the plan from being a church plan for prior years.
26 C.F.R. §1.414(e)-1