Per CO FYI #25:
WHO CAN CLAIM THE PENSION/ANNUITY SUBTRACTION
You can claim the pension/annuity subtraction if you received qualifying pension or annuity income (defined below) and
either:
you were 55 years or older and the end of the tax year, or
you received the qualifying pension or annuity income as a beneficiary because of the death of the person who
earned the pension or annuity.
From reading through this guidance, I believe a person under the age of 55 years old that has taxable income from RMD from inherited IRA should qualify to take a deduction for the amount of the RMD.
Any other CO CPAs here that can confirm? I can't find anything that says this is not the case.