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(2) Defined contribution plans. Two or more defined contribution plans that are not required to be aggregated pursuant to section 415(f) and this section as of the first day of a limitation year do not fail to satisfy the requirements of section 415 with respect to a participant for the limitation year merely because they are aggregated later in that limitation year, provided that no annual additions are credited to the participant's account after the date on which the plans are required to be aggregated. (3) Defined benefit plans(i) First year of aggregation. Two or more defined benefit plans that are not required to be aggregated pursuant to section 415(f) and this section as of the first day of a limitation year do not fail to satisfy the requirements of section 415 for the limitation year merely because they are aggregated later in that limitation year, provided that no plan amendments increasing benefits with respect to the participant under either plan are made after the occurrence of the event causing the plan to be aggregated. (ii) All years of aggregation in which accrued benefits are frozen. Two or more defined benefit plans that are required to be aggregated pursuant to section 415(f) and this section during a limitation year subsequent to the limitation year during which the plans were first aggregated do not fail to satisfy the requirements of section 415 with respect to a participant for the limitation year merely because they are aggregated if there have been no increases in the participant's accrued benefit derived from employer contributions (including increases as a result of increased compensation or service) under any of the plans within the period during which the plans have been aggregated.