From an AP story by Mark Sherman headlined “Justice Barrett’s $425,000 tops among Supreme Court authors”:

Supreme Court justices took in $800,000 in book royalties last year, a lucrative supplement to their judicial salaries, according to financial reports released Thursday.

By far the largest payment went to Justice Amy Coney Barrett, $425,000 for a yet-to-be-released book and likely the first installment on a reported $2 million deal she signed soon after joining the court in 2020.

Justices are being paid $274,200 this year for their work on the bench; Chief Justice John Roberts gets a little more, $286,700.