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Financial information

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

PDF icon 2018 Financial Summary (PDF) 

PDF icon 2017 Financial Summary (PDF) 

PDF icon2016 Financial Summary (PDF) 

PDF icon2015 Financial Summary (PDF)


Audited financial statements 

PDF icon 2018 Financial Statements and Auditor's Report (PDF) 

PDF icon2017 Financial Statements and Auditor's Report (PDF) 

PDF icon2016 Financial Statements and Auditor's Report (PDF) 

PDF icon2015 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.
PDF icon 2018 IRS Form 990 (PDF) 

PDF icon2017 IRS Form 990 (PDF) 

PDF icon2016 IRS Form 990 (PDF) 

PDF icon2015 IRS Form 990 (PDF)

PDF iconIRS 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.