Not always accurately either for those who have been unlucky enough to have received a corrected W2 or whatever said form is. https://www.irs.gov/forms-pubs/abo

Not always accurately either for those who have been unlucky enough to have received a corrected W2 or whatever said form is. https://www.irs.gov/forms-pubs/about-form-w-2-c https://www.irs.gov/forms-pubs/about-form-w-2-c We have to remember too that the government itself is dealing in approximations and assumptions of its own. People make mistakes including those in government and corporations.