Sensible question, though difficult to answer as psychology is such a large field and there are so many different branches. There is also a big difference between the public and private sector. In the UK (don't know where you are based) a state sector psychologist starts off at £20 000 or so, but the promotion prospects are considerable; while in the private sector, salaries can be four times that, though only if you are very experienced. The best information I've found on this profession is at learndirect.
