401(k) Plan received a divorce decree and separation agreement in March 2014, directing the parties to split the participant's account in the Plan (say $12,000). Participant was to retain responsibility for a loan on the account (say $4,000), so that Alternate Payee should have received $6,000, and Participant $2,000 plus what he repays on his loan.
Plan sponsor didn't request a separate QDRO, nor did the parties provide one, and sponsor acted on the general instructions in the settlement agreement. Arguably the settlement agreement wouldn't have qualified as a QDRO, but they didn't realize that and administered it as if it was. However, they then erroneously segregated the account. Instead of paying the AE $6,000, they paid her $4,000 because they thought the parties were sharing responsibility for the loan (i.e., they divided the $8,000 balance after the loan was deducted).
AE has now realized she was underpaid, and wants the Plan to pay her the remaining $2,000. Participant's account has enough to cover this amount. Any thoughts on how to correct? Would her amount need to be adjusted for interest? The settlement agreement was silent on interest, and no separate QDRO policy exists.