This is in response to Casey's message:
My response is based on the proposed loan reg 1.72(p)-1:
1) The participant should receive a 1099-R for $5,000. Interest that accrues after the deemed distribution is disregarded for tax reporting purposes.
2) Interest should accrue on the loan for other purposes - such as calculating the maximum loan amount available for future loans.
3) I'm not sure what year the 1099-R should be issued for. I would make an argument for 1997. The grace period ends on 12/31/96, so you default the loan on January 1, 1997. This seems reasonable - and creates less havoc for the participant than issuing a 1996 1099-R. I guess the participant would prefer a 1998 1099-R but I can't justify doing that.