Does my 22-year-old disabled child qualify for the 2018 CHILD tax credit?

Here's the distinction. The child tax credit is PURELY age related. The first year he was 17 on 12/31, he didn't qualify even if he did qualify as a dependent under the "qualifying child rules."

For 2018, the "other dependent" credit for $500 became available, which is why it's on your tax return.

If you look at your tax returns for the past 4 years, you will see that he wasn't getting the child tax credit, but could quite possibly have been getting EIC. EIC is available only if a child is claimed under the qualifying child rules...and if the child meets the disability tests, can still be claimed even if the child would normally age out.

From publication 596: AGE test: "3. Permanently and totally disabled at any time during

2018, regardless of age."

NO. but there may be some DEPENDENT credits that apply.

There are two items in your question:

As the others have mentioned, the child tax create ends at age 17 regardless of related disability

You should be applying for SSDI for your son, based on your/his other parent's SS credits. This will give him higher benefit amounts and is not asset restricted.

Additionally, it does not sound like he would qualify for SSI. SSI is for low income individuals. A low income individual is defined as low income themselves and they do not have other resources to support them (ie. their parents continuing to support them).

No, child tax credit ends at 17 even if the child is disabled.