What is the going rate for consulting for a federal government entity. I am a scientist with 42 years of experience in the field.
In the US, permanent government researchers are generally paid off the General Schedule. The GS scale has a bunch of grades with GS-14 being roughly equivalent to a tenured professor. The steps of the scale are roughly equivalent to years of experience at the grade. With 42 years of experience, you would have probably topped out at $160,000 a year. There are a few researchers who are part of the Senior Executive Service and make a little more.
In my department, we pay our independent contractors slightly more than the corresponding GS salary since contracting benefits are much worse than government benefits. We also make sub awards to universities to collaborate with faculty. We tend to pay whatever their salary and fringe comes out to.