1. For whatever reason, the OPM likes to put UNKNOWN on the CSF form. Just leave that box (those boxes) blank.
2. The "64199" in 9b represents the total amount of after-tax contributions that you made to your plan while you were working. Be grateful that they did this because it allows people to calculate what percentage of your distribution is taxable.
Note, it is likely that if you took distributions over the full year in 2023 and 2022, then the taxable amount that the CPAs determined for 2022 will be the same as for 2023.
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