If the code in box 7 of the Form 1099-R includes code M (and not code L), you have until the due date of your tax return, including extensions, to complete the rollover of the offset distribution if you can come up with the money to do so. An offset distribution is not a defaulted loan, the offset distribution satisfies the loan. The regular due date of your 2018 tax return is April 15, 2019 (unless you live in Maine, Massachusetts, in which case it's April 17, 2019). If you request a filing extension by the regular due date, the extended due date is October 15, 2019.
