Earlier quoted context omitted.
Employer contributions are tax deferred, not untaxed. Assuming you don't trigger penalties, you'll pay ordinary income on that down the line. I wouldn't expect to retire into a 0% tax bracket, especially if you're maxing the employee contribution.
Many companies offer Roth as an option for a 401K and will put your match into it. So they would be completely untaxed.
(Working on the link)
https://www.irs.gov/retirement-plans/retirement-plans-faqs-o...