It's illegal to require an IQ test/score for a job unless you can reasonably prove that a particular iq score is required. If you say that 130 is required, you have to explain why 129 is not capable of doing the work. As you might imagine, this is a high risk endeavor which is why most places don't ask for it. The SAT, however, is largely an IQ test in disguise and allows employers/universities to skirt the legal problem.

My point is: don’t require it. Just encourage people (perhaps in guides you submit to job-search programs or the like, or even in a newspaper PSA) to get the IQ tests done themselves, and then bring the proof of their IQ with them as an unrequested document. Basically, make it a social more that people should bring IQ test results to the employer, whether or not the employer wants them.

Also, don’t actually call it an IQ test. Get a third party that tests IQ and then issues a branded certification named after the IQ tier you fall into. Like CompTIA certifications: you could be a holder of a “FooTesting Genius Certification”, and employers could ask for that.

You know, like a college degree. Except shorter.