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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. 

Read our 2014 Perennial Report


Financial summaries

2014 Financial Summary

2013 Financial Summary

2012 Financial Summary

2011 Financial Summary   


Audited financial statements 

2014 Financial Statements and Auditor's Report

2013 Financial Statements and Auditor's Report

2012 Financial Statements and Auditor’s Report

2011 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.

2014 IRS Form 990

2013 IRS Form 990

2012 IRS Form 990

2011 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.