By Brendan Pierson

(Reuters) – Tax preparation company H&R Block Inc (NYSE:) on Thursday sued payment company Block Inc, previously called Square Inc (NYSE:) The new name is in violation of its trademarks.

Block’s chief executive officer, Twitter Inc Jack Dorsey cofounder (NYSE:) announced this name change earlier in the month to reflect the company’s desire to move beyond the payment service and into other areas such as blockchain.

In a complaint filed in Kansas City, Missouri, federal court, however, H&R Block accused the company of “stealing Block’s name in order to co-opt the reputation and goodwill that Block has earned through decades of hard work.”

Block has not yet responded to my request for comment.

H&R Block said consumers were likely to be confused by the similar name, noting that it has referred to itself simply as “Block” in some advertisements since 2015.

According to the lawsuit, they were directly competitors in tax preparation services because Block acquired Credit Karma Tax last year, which is now known as Cash App Taxes. The logo for Cash App Taxes, a green square with rounded corners and a dollar sign, is confusingly similar to H&R Block’s green square logo, according to the lawsuit.

H&R Block is seeking a court order barring Block from using the name or green square logo.