How do I calculate RMD on a double inherited IRA? I inherited an IRA from my spouse who recently died 12/2025. He inherited his IRA from his brother in 2022. RMD for 2025 was already withdrawn. How do I calculate future RMD? Form 590B did not seem to address this situation directly. My spouse use life expectancy for the 2years. Can I use 10 year rule, how? my life expectancy or continue with his?