Form 1040-SR, U.S. Tax Return for Seniors 의 INSTRUCTIONS
작성법이 한글로 번역이 된 것이 없다고 나오네요.
아래 링크들을 참조해보세요.
https://www.irs.gov/ko/forms-instructions
https://www.irs.gov/forms-pubs/ebook
https://www.formalu.com/forms/133081/your-federal-income-tax-korean-version