With timely correction of the missed RMD, the excess-accumulation penalty becomes 10% by statute. It could be that Congress lowered penalty to reduce the IRS's motivation for waiving the penalty, but because missed 2023 RMDs are the first to which the statutory reduction in the penalty applies, there is not yet any history of the IRS response to the requests for waivers for late-taken 2023 RMDs.
