Ahoy Captains,

The First thing You want to do is talk to an International Tax Attorney.
https://chambers.com/legal-guide/usa-5
Please do not start with your personal CPA as there is No 'Privilege' if the IRS calls.
You will need to consider issues such as FATCA and FBAR and TIEAs.

The Second thing is to consider retaining your own Broker.
You Broker can make an Offer using a 'Buyer Friendly' Purchase Contract that allows your Broker to hold the Funds in Escrow, as opposed to the Sellers Broker holding funds, which may be more difficult to refund if there are Issues.
Your Broker can also save Time and $ by facilitating a Surveyor, assist with the Surveys, Insurance, delivery of the Yacht, Registration, etc.
Your Broker should get a % of the Gross Sale price and is paid by the Seller.

I Need More Quality Cats for Chartering !
Fair Winds, Brent
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heatseekerinternational.com 5% Comm and Sales-Tax-Free Yacht Brokerage