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

 2019 Financial Summary (PDF) 

 2018 Financial Summary (PDF) 

2017 Financial Summary (PDF) 

2016 Financial Summary (PDF) 

2015 Financial Summary (PDF)

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.

 2019 IRS Form 990 (PDF) 

 2018 IRS Form 990 (PDF) 

2017 IRS Form 990 (PDF) 

2016 IRS Form 990 (PDF) 

2015 IRS Form 990 (PDF)

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.