AMENDMENT NO. 12 TO AMENDED AND RESTATED AGREEMENT AND DECLARATION OF TRUST OF AMERICAN CENTURY MUNICIPAL TRUST

AMENDMENT NO. 12 TO

AMENDED AND RESTATED AGREEMENT AND DECLARATION OF TRUST

OF AMERICAN CENTURY MUNICIPAL TRUST

THIS AMENDMENT NO. 12 TO AMENDED AND RESTATED AGREEMENT AND DECLARATION OF TRUST (“Declaration of Trust”) is hereby adopted as of the 24^th day of March, 2017, by the Trustees hereunder.

WHEREAS, the Board of Trustees have determined that it is in the best interests of American Century Municipal Trust (the “Trust”) to change the name of the Institutional Class of shares to the I Class of shares for the following two (2) series of the Trust (“I Class Name Change”):

• High-Yield Municipal Fund

• Intermediate-Term Tax-Free Bond Fund;

WHEREAS, the Board of Trustees have determined that it is in the best interests of the Trust to add new Y Class of shares for the following two (2) series of the Trust (“New Y Class of Shares”):

• High-Yield Municipal Fund

• Intermediate-Term Tax-Free Bond Fund; and

WHEREAS, the Board of Trustees have determined that it is in the best interests of the Trust to add new T Class of shares for the following one (1) series of the Trust (“New T Class of Shares”):

• Intermediate-Term Tax-Free Bond Fund.

NOW, THEREFORE, BE IT RESOLVED, that the I Class Name Change, New Y Class of Shares, and New T Class of Shares are hereby approved, effective as of April 10, 2017; and

FURTHER RESOLVED, that Schedule A of the Amended and Restated Agreement and Declaration of Trust for the Trust is hereby amended to reflect the I Class Name Change, New Y Class of Shares, and New T Class of Shares by deleting the text thereof in its entirety and inserting in lieu therefore the Schedule A attached hereto.

This Amendment may be executed in counterparts, each of which shall be deemed an original, but all of which shall constitute one and the same instrument.

[Remainder of page intentionally left blank; signature page to follow.]

IN WITNESS WHEREOF, a majority of the Trustees do hereto set their hands as of the date first referenced above.

Trustees of the American Century Municipal Trust

/s/ Xxxxx X. Xxxxx /s/ Xxxxxx X. Xxxxx

Xxxxx X. Xxxxx Xxxxxx X. Xxxxx

/s/ Xxxx Xxxxxxxxx /s/ Xxxxxx X. Xxxxxx

Xxxx Xxxxxxxxx Xxxxxx X. Xxxxxx

/s/ Xxxxxxxxx X.X. Xxxxxx /s/ Xxxxxxxx X. Xxxxx

Xxxxxxxxx X.X. Xxxxxx Xxxxxxxx X. Xxxxx

/s/ Xxxxx X. Xxxxxxx /s/ Xxxx X. Xxxxxx

Xxxxx X. Xxxxxxx Xxxx X. Xxxxxx

/s/ Xxxxxxxx X. Xxxxxx

Xxxxxxxx X. Xxxxxx

2

SCHEDULE A

American Century Municipal Trust

Pursuant to Article III, Section 6, the Trustees hereby establish and designate the following Series as Series of the Trust (and the Classes thereof), with the relative rights and preferences as described in Section 6:

Series	Class	Date of Establishment
Tax-Free Money Market Fund	Investor	07/31/1984
Intermediate-Term Tax-Free Bond Fund	Investor	07/31/1984
	I Class	12/17/2002*
	A Class	03/01/2010
	C Class	03/01/2010
	T Class	04/10/2017
	Y Class	04/10/2017
High-Yield Municipal Fund	Investor	12/15/1997
	I Class	03/01/2010*
	A Class	05/08/2002
	C Class	05/01/2001
	Y Class	04/10/2017

This Schedule A shall supersede any previously adopted Schedule A to the Declaration of Trust.

*Formerly Institutional Class; name changed to I Class on April 10, 2017.

A-1

J:\LG\ACMT\Charter Documents\Amendment No. 12 to Declaration of Trust.ACMT.doc