UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM N-CSR

CERTIFIED SHAREHOLDER REPORT OF REGISTERED
MANAGEMENT INVESTMENT COMPANIES


Investment Company Act file number811-04025
AMERICAN CENTURY MUNICIPAL TRUST
(Exact name of registrant as specified in charter)
4500 MAIN STREET, KANSAS CITY, MISSOURI64111
(Address of principal executive offices)(Zip Code)
JOHN PAK
4500 MAIN STREET, KANSAS CITY, MISSOURI 64111
(Name and address of agent for service)
Registrant’s telephone number, including area code:816-531-5575
Date of fiscal year end:05-31
Date of reporting period:05-31-2021




*Explanatory Note

The Registrant is filing this amendment to its Form N-CSR for the period ended May 31, 2021, originally filed with the Securities and Exchange Commission on July 28, 2021 (Accession Number 0000746458-21-000007). The purpose of this amendment is to update Item13(a)(4) and related exhibits. Other than the aforementioned correction, this amended Form N-CSR does not reflect events occurring after the filing of the original Form N-CSR, or modify or update the disclosures contained therein.

Items 1 through 12, Item 13(a)(1) and Item 13(a)(3) of this amendment to the Registrant’s Form N-CSR are incorporated herein by reference to the Form N-CSR filed on EDGAR on July 28, 2021 (Accession Number 0000746458-21-000007).

* * * * *

ITEM 13. EXHIBITS.

(a)(2) Separate certifications by the registrant’s principal executive officer and principal financial officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and Rule 30a-2(a) under the Investment Company Act of 1940, are filed and attached hereto as EX-99.CERT.


(a)(4)(i) Change in Registrant’s Independent Public Accountant
(a)(4)(ii) Letter from PricewaterhouseCoopers LLP

(b) A certification by the registrant’s chief executive officer and chief financial officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, is furnished and attached hereto as EX-99.906CERT.



SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
Registrant:American Century Municipal Trust
By:/s/ Patrick Bannigan
Name:Patrick Bannigan
Title:President
Date:August 2, 2021


Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
By:/s/ Patrick Bannigan
Name: Patrick Bannigan
Title: President
          (principal executive officer)
Date:August 2, 2021
By:/s/ R. Wes Campbell
Name: R. Wes Campbell
Title: Treasurer and
          Chief Financial Officer
          (principal financial officer)
Date:August 2, 2021


Document

EX-99.CERT
CERTIFICATIONS

I, Patrick Bannigan, certify that:

1.    I have reviewed this report on Form N-CSR of American Century Municipal Trust;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.


Date:August 2, 2021
/s/ Patrick Bannigan
Patrick Bannigan
President
(principal executive officer)



I, R. Wes Campbell, certify that:

1.    I have reviewed this report on Form N-CSR of American Century Municipal Trust;

2.    Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.    Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations, changes in net assets, and cash flows (if the financial statements are required to include a statement of cash flows) of the registrant as of, and for, the periods presented in this report;

4.    The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940) and internal control over financial reporting (as defined in Rule 30a-3(d) under the Investment Company Act of 1940) for the registrant and have:

(a)    Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)    Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)    Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of a date within 90 days prior to the filing date of this report based on such evaluation; and

(d)    Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the period covered by this report that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5.    The registrant's other certifying officer and I have disclosed to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)    All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize, and report financial information; and

(b)    Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.



Date:August 2, 2021
/s/ R. Wes Campbell
R. Wes Campbell
Treasurer and Chief Financial Officer
(principal financial officer)


Document

Exhibit 13(a)(4)(i) – Change in Registrant’s Independent Public Accountant
On June 16, 2021, the fund’s Audit and Compliance Committee and Board of Trustees approved a change to the fund’s independent registered public accountant. PricewaterhouseCoopers LLP was dismissed and Deloitte & Touche LLP was appointed as the independent registered public accounting firm for the fiscal year ending May 31, 2022.
During the fiscal years ended May 31, 2020 and May 31, 2021 and the subsequent interim period through June 16, 2021, there were no disagreements with PricewaterhouseCoopers LLP on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to their satisfaction would have caused them to make reference to the subject matter of the disagreements in connection with their reports or reportable events, as such term is described in Item 304(a)(1) of Regulation S-K of the Securities Exchange Act of 1934, as amended. The audit reports of PricewaterhouseCoopers LLP on the financial statements of the fund for the fiscal years ended May 31, 2020 and May 31, 2021, did not contain any adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles.
During the fiscal years ended May 31, 2020 and May 31, 2021 and the subsequent interim period through June 16, 2021, neither the fund, nor anyone on its behalf, consulted with Deloitte & Touche LLP, on behalf of the fund, regarding the application of accounting principles to a specified transaction (either completed or proposed), the type of audit opinion that might be rendered on the fund’s financial statements, or any matter that was either the subject of a disagreement or a reportable event, as such terms are described in Item 304(a)(1) of Regulation S-K of the Securities Exchange Act of 1934, as amended.
The fund requested that PricewaterhouseCoopers LLP furnish it with a letter addressed to the Securities and Exchange Commission stating whether PricewaterhouseCoopers LLP agrees with the statements contained above. A copy of the letter from PricewaterhouseCoopers LLP to the Securities and Exchange Commission is filed as an exhibit hereto.


Document

Exhibit 13(a)(4)(ii) – Letter from PricewaterhouseCoopers LLP

August 2, 2021



Securities and Exchange Commission
100 F Street, N.E.
Washington, DC 20549


Commissioners:

We have read the statements made by American Century Municipal Trust (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 13(a)(4) of Form N-CSR of American Century Municipal Trust dated August 2, 2021. We agree with the statements concerning our Firm contained therein.

Very truly yours,

/s/ PricewaterhouseCoopers LLP


Kansas City, Missouri



Attachment




























Attachment

Exhibit 13(a)(4)(i) – Change in Registrant’s Independent Public Accountant

On June 16, 2021, the fund’s Audit and Compliance Committee and Board of Trustees approved a change to the fund’s independent registered public accountant. PricewaterhouseCoopers LLP was dismissed and Deloitte & Touche LLP was appointed as the independent registered public accounting firm for the fiscal year ending May 31, 2022.

During the fiscal years ended May 31, 2020 and May 31, 2021 and the subsequent interim period through June 16, 2021, there were no disagreements with PricewaterhouseCoopers LLP on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to their satisfaction would have caused them to make reference to the subject matter of the disagreements in connection with their reports or reportable events, as such term is described in Item 304(a)(1) of Regulation S-K of the Securities Exchange Act of 1934, as amended. The audit reports of PricewaterhouseCoopers LLP on the financial statements of the fund for the fiscal years ended May 31, 2020 and May 31, 2021, did not contain any adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope or accounting principles.

During the fiscal years ended May 31, 2020 and May 31, 2021 and the subsequent interim period through June 16, 2021, neither the fund, nor anyone on its behalf, consulted with Deloitte & Touche LLP, on behalf of the fund, regarding the application of accounting principles to a specified transaction (either completed or proposed), the type of audit opinion that might be rendered on the fund’s financial statements, or any matter that was either the subject of a disagreement or a reportable event, as such terms are described in Item 304(a)(1) of Regulation S-K of the Securities Exchange Act of 1934, as amended.

The fund requested that PricewaterhouseCoopers LLP furnish it with a letter addressed to the Securities and Exchange Commission stating whether PricewaterhouseCoopers LLP agrees with the statements contained above. A copy of the letter from PricewaterhouseCoopers LLP to the Securities and Exchange Commission is filed as an exhibit hereto.


Document

EX-99.906CERT

CERTIFICATION
PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002



In connection with the shareholder report of American Century Municipal Trust (the "Registrant") on Form N-CSR for the period ending May 31, 2021 (the "Report"), we, the undersigned, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1)    The Report fully complies with the requirements of Section 15(d) of the Securities Exchange Act of 1934; and

(2)    The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date:August 2, 2021
By:/s/ Patrick Bannigan
Patrick Bannigan
President
(chief executive officer)
By:/s/ R. Wes Campbell
R. Wes Campbell
Treasurer and Chief Financial Officer
(chief financial officer)