Taxpayer has a beneficiary IRA inherited when father died in 2017. Never told his preparer about this until now and never took an RMD from it until now; probably assumed it wasn't necessary until he turned 72 last October but even then took RMD only from his own IRA and not the beneficiary one.
It would seem that this IRA is covered by the pre-SECURE "Stretch IRA" rules of computing RMDs on the beneficiary's life expectancy factors, although there's a question as to whether failure to take RMDs to date might somehow subject the IRA now to the SECURE 10-year clearout rule instead (though I'm not finding anything to support that idea).
Either way, best step now (for 2023)?
1) Take accumulated RMD this year to include prior missed 5 years based on Stretch?
2) Take initial RMD now based on Stretch as if first one, disregarding missed years?
3) Take 60% of IRA now, assuming it has to be cleared out by 2017 under SECURE?
4) Some other option?
Thanks for any insights.