If someone left you a traditional IRA, the IRS sets the schedule for emptying it. For most people who inherit from an owner who died in 2020 or later, everything has to come out by the end of the 10th year after the death.[1] Some of them also owe a withdrawal every year before that, and the yearly deadline is December 31.[1]
The same 10-year rule covers inherited 401(k)s and other defined contribution plans when the participant died after December 31, 2019.[2] This page uses IRAs for the examples. Every rule below comes from IRS Publication 590-B, the 2025 edition, and the IRS's required minimum distribution FAQs.

