Solved
What Form can we use in addition to the original 1099-R? Or should we keep waiting on TSP to finally get it corrected and file an extension?
Section 408(d)(4) pertains only to IRAs. The federal TSP is not an IRA.
With regard to the federal TSP, there is no such thing as a return of contribution before the due date of your tax return. Elective deferrals are irrevocable, so if you received a distribution before reaching age 59½, the distribution is an early distribution subject to penalty and code 1 is correct.
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