EX-99.CERT 3 ex99_cert-64390.htm CERTIFICATION ex99_cert-64390.pdf -- Converted by SECPublisher 4.0, created by BCL Technologies Inc., for SEC Filing
    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:  		March 24, 2006  TRACY ATKINSON 
      Tracy Atkinson 
      Treasurer (Principal Financial Officer and 
      Accounting Officer) 

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 disclosurecontrols 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 
   
   
   

                                                                                                                   EX-99.CERT 
             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:  		March 24, 2006  MARIA F. DWYER 
      Maria F. Dwyer 
      President (Principal Executive Officer)