Quarterly estimated taxes are due in 21 days — self-employed and gig workers who underpay by June 15 get hit with an 8% IRS penalty
June 15, 2026, is 21 days away, and for the roughly 64 million Americans who earned freelance or gig income last year, according to a McKinsey estimate, it carries a price tag most of them would rather not think about: the second quarterly estimated tax payment of the year is due. Miss it or come…