You will enter zero in this field. The due date to take your RMD for the first time is the following April; which in your case is April 1st, 2026. After that, your RMD deadline is December 31 of each year. The TurboTax screen is trying to figure out what the RMD was for the current year to determine whether you are subject to penalties or not. Since you weren't required to take out your 2025 RMDs by Dec 31st, you won't be subject to any penalties therefore, you will enter zero even if you still took out your RMDs before the year-end.