Trump has fiercely guarded his tax filings and is the only US President in modern times not to make them public.
Speaking at a news conference at the White House, Trump dismissed the report as "fake news" and said he has paid taxes, though he gave no specifics.
Biden's quickfire response to the revelations says that the average American pays US$11,165 (NZ$17,030) in taxes each year - equating to US$10,415 more than the billionaire president.