<DOCUMENT>
<TYPE>EX-99.CERT
<SEQUENCE>2
<FILENAME>ex99_cert-65555.txt
<DESCRIPTION>CERTIFICATION
<TEXT>
<PAGE>
                                                                     EX-99.CERT
                           MFS MUNICIPAL INCOME TRUST

                                 CERTIFICATION

I, Tracy Atkinson, certify that:

1. I have reviewed this report on Form N-Q of MFS Municipal Income 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 schedules of investments included in this report
   fairly present in all material respects the investments of the registrant as
   of the end of the fiscal quarter for which the report is filed;

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 registrant's
        most recent fiscal quarter 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: September 25, 2006                TRACY ATKINSON
      ------------------                ---------------------------------------
                                        Tracy Atkinson
                                        Treasurer (Principal Financial Officer
                                        and Accounting Officer)
<PAGE>
                                                                     EX-99.CERT
                           MFS MUNICIPAL INCOME TRUST

                                 CERTIFICATION

I, Maria F. Dwyer, certify that:

1. I have reviewed this report on Form N-Q of MFS Municipal Income 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 schedules of investments included in this report
   fairly present in all material respects the investments of the registrant as
   of the end of the fiscal quarter for which the report is filed;

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 registrant's
        most recent fiscal quarter 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: September 25, 2006                MARIA F. DWYER
      ------------------                ---------------------------------------
                                        Maria F. Dwyer
                                        President (Principal Executive Officer)
</TEXT>
</DOCUMENT>
