Mandatory Tenders, Mode Transition) Exhibit D Form of Retention Notice (Mandatory Tenders) ii REMARKETING AGREEMENT This REMARKETING AGREEMENT, dated as of [●] (this "Agreement"), by and among Nuveen AMT-Free Municipal Credit Income Fund, a closed-end investment company organized as a Massachusetts business trust (the "Fund"), Nuveen Fund Advisors, LLC, a registered investment adviser and wholly-owned subsidiary of Nuveen Investments, Inc. (the "Investment Adviser"), and [●] (the "Remarketing Agent"). WITNESSETH: WHEREAS, the Fund is issuing Series [●] MuniFund Preferred Shares, par value $.01 per share (the "MFP Shares"), with a liquidation preference of $[●] per share, pursuant to and with the preferences, voting powers, restrictions, limitations as to dividends, qualifications, and terms and conditions of redemption assigned to them in the Fund's Statement Establishing and Fixing the Rights and Preferences of Series [●] MuniFund Preferred Shares effective [●], as amended, revised or supplemented from time to time (the "Statement"), as modified with respect to the Initial Mode by the Supplement to the Statement Establishing and Fixing the Rights and Preferences of Series [●] MuniFund Preferred Shares Initially Designating the Variable Rate Remarketed Mode for the Series [●] MuniFund Preferred Shares effective [●], as amended, revised or supplemented from time to time (the "Supplement"; references in this Agreement to the Supplement shall be deemed to include the Statement); WHEREAS, the Fund has requested [●] to act as the Remarketing Agent under this Agreement while the MFP Shares are in the Variable Rate Remarketed Mode in accordance with the provisions of the Supplement (and the Board of Trustees of the Fund has adopted a resolution appointing [●] as the Remarketing Agent) to perform the duties set forth herein and to perform such other duties as are assigned to the Remarketing Agent herein and in the Supplement, all pursuant to the procedures set forth