Quarterly Period​Due Date
​January 1 – March 31​Last business day of April
​April 1 – June 30Last business of ​July
​July 1 – September 30​Last business day of October
​October 1 – December 31Last business day of ​January

For more information and ways to pay, please contact

Website: http://www.orhma.com/
Phone: (905) 361-0268 or (800) 668-8906
Fax: (905) 361-0288 or (888) 359-5588
Email: info@orhma.com