As far as I know there is no "waver" of the RMD requirement of either the 5 year rule or yearly distributions based on the beneficiaries life expediency unless the IRS grants a waver which can only be applied for with a 5329 form for each year that the RMD was missed - ignorance if the inheritance would be a valid reason when applying for the waiver.
I know of nothing in the tax law that the RMD requirement can just be ignored in a case like this when the inheritance was unknown to the beneficiary until after the RMD dates had passed. I also do not know how a IRA benficuary can claim a distribution (no matter how late) as other income.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**
