I'm in the process of trying to close a purchase transaction for a vacant lot where the seller is not a US citizen, and he does not live in the US (but the property is located here), and in case anyone else ever finds themselves in this situation, especially if trying to do a self-closing or working with a title company that may not be experienced at dealing with foreign sellers, I wanted to share what I've learned about FIRPTA, the Foreign Investment in Real Property Tax Act.
This refers to a particular type of tax withholding from the proceeds that would otherwise go to the foreign Seller, that are required to be done at the time of the transaction closing, with the withheld funds to be sent to the IRS along with Form 8288 within 20 days of the closing. I'm not a lawyer, but based on the various webpages I've read about FIRPTA, including IRS.gov pages and other ones from accounting / tax law firms like this one, the default withholding rate is 15% of the total sale price, and the requirement falls on the "withholding agent" to ensure that these funds are withheld from the Seller and are sent to the IRS. From what I've read on pages like this one, "Every person who controls, holds custody of, receives, disposes of, or pays any item of income to a foreign person that is subject to foreign withholding is a withholding agent." So this could be the title company, or if you're doing a self-closing it would be you, and if the withholding agent fails to comply, they can be held liable by the IRS for paying the 15% amount themselves. This is why I say this could be so critical for anyone doing self-closings, in particular.
There are some very specific exceptions that can make certain foreign sellers exempt from this withholding entirely, none of which would appear to apply to just about any vacant land flipping scenario that I would generally envision (i.e. the most common ones have to do with the property being a primary residence). Aside from that, if the foreign seller believes their actual tax liability associated with the sale should be less than the default amount of 15% of the sale price, they can submit an application to the IRS, asserting their cost basis for the property and requesting a "withholding certificate", which from what I understand would basically be a certification from the IRS that the withholding agent (buyer or their title company) should actually withhold some specific amount less than 15%. I think I read on one of the pages that it can take 90 days to get that certificate from the IRS, after the Seller has submitted their application, and the implication seems to be that this should be done before the closing, not after. I'm not clear, personally, on whether the seller can submit the application after the closing and get any excess withholding refunded that way, or if they might have to submit some type of tax return at that point, instead.
I don't know how often others have or will come across this, but I found this a whole lot more interesting once I realized the liability the buyer could be exposed to, personally, for failure to comply.