As a US citizen living abroad, your son has to file a US tax return and report his worldwide income. He'll file form 1040.
He may qualify to exclude his foreign earnings from income up to an amount that is adjusted annually for inflation ($120,000 for 2023). In addition, he can exclude or deduct certain foreign housing amounts.
See this IRS document.
He can use TurboTax to file his tax return.
Please read this TurboTax Help article.
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