IRS Pub 559 -- "If the decedent accounted for income under the cash method, only those items actually or constructively received before death are included on the final return.
Income in Respect of a Decedent
All income the decedent would have received had death not occurred that was not properly includible on the final return, discussed earlier, is income in respect of a decedent.
How To Report
Income in respect of a decedent must be included in the income of one of the following.
- The decedent's estate, if the estate receives it.
- The beneficiary, if the right to income is passed directly to the beneficiary and the beneficiary receives it.
- Any person to whom the estate properly distributes the right to receive it."
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