The foreign earned income exclusion is available only for income earned for services performed in a foreign country, and is claimed on IRS Form 2555 or 2555-EZ. The maximum foreign earned income exclusion is indexed annually for inflation; for 2023. it was $100,800 per person. However, the Personal Income Tax Rate in South Korea stands at 40 percent. If you can land a US job, you may be better off tax wise.