1099-R Death Benefit

When you receive a 1099-R with a distribution code 4 (Death Benefit), it indicates an inherited IRA. 

Here's what to do if boxes 2a and 9b are marked "unknown":

• Box 1 (Gross Distribution): Enter the full amount from box 1 as the gross distribution.
• Box 2a (Taxable Amount): Since box 2a is "unknown," you may need to calculate the taxable amount manually.
  • In TurboTax, once you enter code 4, it will ask a series of subsequent questions to determine how much, if any, is taxable.
• Box 9b (Total Employee Contributions): This box shows the total after-tax contributions. If it's "unknown," TurboTax will guide you through this as well.

For more detailed guidance, you can refer TurboTax article on inherited IRA and retirement plan taxation.