As a nonprofit organization, The Morton Arboretum holds itself accountable to the public, including all its members and other constituents who support the Arboretum’s vision of a greener, healthier, more beautiful world where people and trees thrive together.

In the IRS Determination Letter:

• Internal Revenue Code section 509(a)(1) is a subcategory of 501(c)(3).
• Internal Revenue Code sections 509(a)(1) and 170(b)(1)(A)(vi) refer to an organization that is operated exclusively for charitable purposes and that normally receives a substantial portion of its support from the public.

As a non-profit organization, The Morton Arboretum provides full disclosure tax exemption and IRS information.