That should probably be part of the irremovable trust's final tax return or the estate's tax return. Check with the attorney handling the estate. If the annuity was part of your mother-in-laws estate, then the income would be reported on her estate tax return and flow out to the beneficiaries through the final K1. Whoever prepared the estate tax return should have included the annuity or IRA income on that return. Check the social security number on the 1099R. Make sure it is your father in laws and not the trust EIN. But I would start with checking with the estate's attorney. You should not have to file a tax return for your father-in-law that deceased years ago.
