I prepared certification forms for my clients to sign who have CTC, ACTC, ODC, or OATC on their tax returens. I do not have enough HOH or EITC clients to worry about standardized forms. I have my clients read through the IRS garbage and then sign the certification, which I keep in my file as proof that I tried to be an IRS agent for a few minutes qand grill my clients. Most of the clients comment about the IRS language, especially about the definition of "dependent" for many of the credits. It gives them a new perspective of what we have to put up with year after year with more and more clarifications and exceptions to prior definitions. One client even said "Is the IRS nuts or what?" I just smiled .
Anyhow, I have attached the forms I produced in case others would like to adopt them or modify them for their use.
CTC, , ODC CERTIFICATION.pdf
AOTC TAX CREDIT CERTIFICATION.pdf