Comment by twothreeone

Interesting.. maybe the IRS contracted development and/or hosting from Intuit instead of doing it in-house. But it's completely free of charge, you don't need an Intuit account or sign their EULA/privacy policy or anything like that. And the official documentation for the tool itself is issued by the IRS [0].

[0] https://www.irs.gov/pub/irs-pdf/p5274.pdf