How to fax IRS forms online in 2026: a developer's practical guide (opens in new tab)

If you write software for a living, faxing feels like a fossil. Yet in 2026 the IRS still accepts (and for some forms, prefers) a fax. If you've ever had to send a Form 2553 to elect S-corp status for your one-person LLC, or fax a Form 9465 installment-agreement request, you've hit this wall: no fax machine, no landline, and a deadline. This is a practical, no-nonsense guide to faxing IRS forms online — what actually works, the validation gotchas that trip people up, and the free tools that m...