VISIT & explore

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. 

Read The Morton Arboretum's 2013 Annual Report

Financial summaries

2013 Financial Summary

2012 Financial Summary

2011 Financial Summary  

2010 Financial Summary  


Audited financial statements 

2013 Financial Statements and Auditor's Report

2012 Financial Statements and Auditor’s Report

2011 Financial Statements and Auditor’s Report   

2010 Financial Statements and Auditor’s Report   


IRS tax-exempt status information 

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

2013 IRS Form 990

2012 IRS Form 990

2011 IRS Form 990  

2010 IRS Form 990  

IRS Determination Letter

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.