29 CFR § 4041.5 - Record retention and availability.
(a) Retention requirement—(1) Persons subject to requirement; records to be retained. Each contributing sponsor and the plan administrator of a plan terminating in a standard termination, or in a distress termination that closes out in accordance with § 4041.50, must maintain all records necessary to demonstrate compliance with section 4041 of ERISA and this part. If a contributing sponsor or the plan administrator maintains information in accordance with this section, the other(s) need not maintain that information.
(2) Retention period. The records described in paragraph (a)(1) of this section must be preserved for six years after the date when the post-distribution certification under this part is filed with the PBGC.
(3) Electronic recordkeeping. The contributing sponsor or plan administrator may use electronic media for maintenance and retention of records required by this part in accordance with the requirements of subpart E of part 4000 of this chapter.
(b) Availability of records. The contributing sponsor or plan administrator must make all records needed to determine compliance with section 4041 of ERISA and this part available to the PBGC upon request for inspection and photocopying (or, for electronic records, inspection, electronic copying, and printout) at the location where they are kept (or another, mutually agreeable, location) and must submit such records to the PBGC within 30 days after the date of a written request by the PBGC or by a later date specified therein.