Puerto Rico's Department of Treasury published Internal Revenue Circular Letter No. 26-13 on 30 June 2026, which concerns the integration of the Municipal Sales and Use Tax (Municipal SUT) into Unified Internal Revenue System (SURI), along with State SUT. Starting with the monthly return for July 2026 (due 20 August 2026) merchants will be able to file and pay the Municipal SUT for participating municipalities directly through SURI, rather than using separate procedures handled by the Munici…