WASHINGTON — The Internal Revenue Service today reminded thousands of tax-exempt organizations of their May 15, 2023, filing deadline. The annual filing due date for certain returns filed by tax-exempt organizations is normally by the 15th day of the 5th month after the end of an organization’s accounting period. Those operating on a calendar-year (CY) basis must file a return by May 15, 2023. Returns due include: Form 990-series annual […]