SJ Digital Downloads is the download shop of SJ AI Studio, a one-person studio in South Korea that builds calculators, spreadsheets and small offline tools.

Every rate, fee and size rule in our files is taken from the official source — IRS publications, state revenue and Secretary of State pages, passport offices — and each file lists those pages and the date we checked them; where an official page could not be read, we say so instead of guessing.

Our files are planning tools, not tax, legal or payroll advice, and we are not affiliated with any government office.

Questions, corrections or refund requests: sungje5575@gmail.com