@bobdrad
You are partly correct. Revenue Ruling 2014-7 applies difficulty of care payments under the foster care rule to Medicaid waiver payments as well.
https://www.irs.gov/irb/2014-04_IRB#NOT-2014-7
However, difficulty of care payments can only be used to make non-deductible IRA contributions, not deductible IRA contributions, and not Roth IRA contributions. This is also noted in publication 590-A.
https://www.irs.gov/publications/p590a
Difficulty of care payments. For contributions after December 20, 2019, you are able to elect to increase the nondeductible IRA contribution limit by some or all of the amount of difficulty of care payments, which are a type of qualified foster care payment, received. If you receive difficulty of care payments, then those amounts may increase the amount of nondeductible IRA contributions you can make but not above the $7,000 IRA deductible amount ($8,000 if you are age 50 or older). The increase to the nondeductible IRA contribution limit equals the lesser of (i) the amount of difficulty of care payments excluded from gross income, or (ii) the amount by which the deductible limit for IRA contributions exceeds the amount of the taxpayer's compensation included in gross income for the tax year.
Form 8606. To designate contributions as nondeductible, you must file Form 8606.
You don’t have to designate a contribution as nondeductible until you file your tax return. When you file, you can even designate otherwise deductible contributions as nondeductible contributions.
You must file Form 8606 to report nondeductible contributions even if you don’t have to file a tax return for the year.
So yes, you can make non-deductible IRA contributions using the difficulty of care payments to qualify. If you have not already made the contribution, and you want to make a 2025 contribution, it may be difficult to get the plan to process the deposit by close of business tomorrow. If they miss the deadline, it won't count that you tried. And you will have to use form 8606 and track your non-deductible basis, so that future withdrawals would be partly non-taxable using the pro rata rule. (And I'm curious to see if Turbotax understands this exception.)