According to Wikipedia, FEIN is an abbreviation for Federal Employer Identification Number in the US. Cursory googling shows me that as a name, it could be pronounced fine or like faint, and in german, it should be pronounced fine; however, this doesn't give me a definite answer to whether there is a correct way to pronounce the acronym. I work for an insurance company, and although I've heard both pronunciations from time to time, that doesn't satisfy my curiosity.

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    Heh. I'd say "eff-ee-eye-en". I don't know how it would be possible to establish a "correct" pronunciation for it, though. Consider the comments on this similar question: Pronunciation of file format GIF – herisson Dec 2 '16 at 23:29
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    Technically speaking, as an abbreviation, it is pronounced "Federal Employer Identification Number". In fact it's at the point that it starts to be pronounced as "fine" or "fain" that it isn't so much an abbreviation anymore but an acronym. – MetaEd Dec 2 '16 at 23:34
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    EIN is pronounced "ee-eye-en", I imagine FEIN would be an extension of that. – John Feltz Dec 2 '16 at 23:52
  • You'll only see FEIN used in places like the benefits industry or tax laws; in everyday usage, it's EIN, with each letter pronounced as John Feltz notes, and where a distinction is required between federal, state, or other identifiers, in my experience (and I used to work in the benefits industry) people tend to refer to tax ID as opposed to EIN, especially at the state level, as states may use other terminology like seller's permit number or some such. – choster Dec 3 '16 at 0:27
  • I’d be likely to pronounce it /heɪn/ and just assume it had a sinn missing… – Janus Bahs Jacquet Dec 3 '16 at 1:11

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