A taxpayer has been charged with mailing a threatening communication after he responded to a notice from the Internal Revenue Service about overdue taxes by scribbling a profanity on the letter and mailing it back to the IRS.

Enrique Santiago of the Bronx, N.Y., allegedly wrote, “I do not live at this address anymore, so go f--k yourself,” on the IRS notice and told the post office to return it to the sender. The IRS had intended the notice for his nephew, named Enrique A. Santiago, but he had moved out of the elder Santiago’s home a month earlier after a “physical altercation” with his uncle, according to the New York Post. Santiago shares a similar name with his nephew, who owes the IRS $3,032.57 in unpaid taxes.

In addition to the curse-filled missive, the elder Santiago also allegedly put white powder in the envelope, causing an IRS office in Long Island to be locked down until authorities determined it was only soap. He was charged with providing false information and mailing a threatening communication.