Hello JA Customer,
If you are a US citizen or a resident of the US, then if you receive a foreign gift or foreign inheritance that exceeds $100,000 in one year, then you must report the receipt of that gift or inheritance by filing Form 3520 with the IRS. Part IV of that form is the only section you would need to complete.
There is no tax due with that form, as it is strictly for informational purposes. Filing the form 3520 is really for your own protection as you then have a clear record of reporting the source of this money.
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Thank you JA Customer