401 k loan default do I need any papers for this to file?

[RichardG]

If the load is in default, the plan administrator may classify the unpaid loan balance as a deemed distribution.  In that case you'll receive Form 1099-R from the plan administrator.  Unless you receive that form from the plan administrator, there's nothing for you to report.  Please follow this link for more information. https://www.irs.gov/retirement-plans/retirement-plans-faqs-regarding-loans#4