How do I use the HomeTax (홈택스) website to file taxes, check my tax records, and get tax certificates as a foreigner in Korea?

HomeTax (hometax.go.kr) is the National Tax Service site where you file taxes, check records, and issue certificates, and it has an English version (look for the language toggle) plus a mobile app called Son-Tax (손택스). To log in you'll need a way to verify your identity — a certified digital certificate (공동/금융인증서), or simple login through your bank or phone authentication tied to your ARC. Once in, foreigners commonly use it for the May global income tax return (종합소득세), checking year-end settlement, and issuing things like an income certificate or tax payment certificate (납세증명서) as PDFs. If the interface is confusing, the NTS runs an English helpline at 1588-0560, and there's extra foreigner support during May filing season.