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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 2015 Perennial Report

Financial summaries

PDF icon2015 Financial Summary

PDF icon2014 Financial Summary

PDF icon2013 Financial Summary

PDF icon2012 Financial Summary


Audited financial statements 

PDF icon2015 Financial Statements and Auditor's Report

PDF icon2014 Financial Statements and Auditor's Report

PDF icon2013 Financial Statements and Auditor's Report

2012 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.

PDF icon2014 IRS Form 990

PDF icon2013 IRS Form 990

PDF icon2012 IRS Form 990

2011 IRS Form 990  

PDF iconIRS 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.