We set up a company in Ireland in 2023 and have never been advised nor asked to fill out a W-9 form to take payment from State-side companies under our Irish LTD.We then set up an LLC in New York in 2023. For tax reasons, companies we work with in the States have asked us to pra W-9 form before sending payment to our NY office.Basic requirements to file:u2023 You have a company EIN. Barring this youu2019ll need either your SSN or TIN.u2023 You trade under a legal business entity (c-corp, llc etc) that is based in the USA.It is not necessary that an Irish-based business entity file W-9 forms, as they are only specific to US tax requirements.