我覺得他如果不加入Medicare還是可以拿ACA補助，因為Medicare Part A要交費

Publication 974有說：

“Exceptions.

While you are generally considered eligible for government-sponsored MEC (and are ineligible for the PTC) if you are able to enroll in that coverage, you are considered eligible for government-sponsored coverage under the following programs only if you are enrolled in the program.

4. Coverage under Medicare Part A for which the individual must pay a premium.”

就是說，既然你Medicare Part A要交premium，如果你不是enrolled in Medicare Part A，你不算eligible for government-sponsored coverage，所以還是可以拿PTC。