Many company's accounting departments require W9s, just for standard accounting/business practices. Many times these forms are requested because the insurance companies are demanding this paperwork (i.e. general/professional liability policies) If your business is incorporated, or if you are a...
All listings are done on the state level. I found a way to find this information for Connecticut. Go to this website:
https://data.ct.gov/Business/State-Licenses-and-Credentials/ngch-56tr/data
Each engineer that is on that list that has the code "HTG" is a mechanical engineer (HVAC, etc.). I...