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 mission to plant and conserve trees and other plants for a greener, healthier, and more beautiful world.
Financial summaries
Audited financial statements
2019 Financial Statements and Auditor's Report (PDF)
2018 Financial Statements and Auditor's Report (PDF)
2017 Financial Statements and Auditor's Report (PDF)
2016 Financial Statements and Auditor's Report (PDF)
2015 Financial Statements and Auditor's Report (PDF)
IRS tax-exempt status information
As a non-profit organization, The Morton Arboretum provides full disclosure tax exemption and IRS information.
IRS Determination Letter (PDF)
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.