As a 501(c) (3) public charity, all donations to VolunteerMatch are tax deductible. Our EIN # is 77-0395654. For some matching software we may be listed under our original name Impact Online. To donate via mail, kindly send your check payable to VolunteerMatch to 5424 Sunol Blvd, Ste 10 PMB1164, Pleasanton, CA 94566. Thank you for your support.