The "10 years younger" is if you inherited from a spouse. If a non-spouse use Table III.
The RMD amount must be calculated each year using the IRA value at the end of the previous year.
You can ask the financial institution holding the IRA to calculate the RMD for you (they are required by law to do that if you request it - many just do it anyway.)
If you are the surviving spouse who is the sole beneficiary of your deceased spouse's IRA, you may elect to be treated as the owner and not as the beneficiary. If you elect to be treated as the owner, you determine the required minimum distribution (if any) as if you were the owner beginning with the year you elect or are deemed to be the owner.
**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.**
