What is the pay difference between a psychiatrist and a psychologist?

While psychiatrists tend to make more on average, the actual difference in pay depends on quite a lot.

Geographical location is a big way: in different parts of a country (and, indeed, in different countries), pay varies quite a lot.

Job location also varies pay rates (and the difference in pay). For example, someone working in a public hospital or mental institution will earn much less than someone who runs their own private practice.

To find out, I suggest pinpointing an area and institution and investigating those.