<SEC-DOCUMENT>0001104659-12-063550.txt : 20120914
<SEC-HEADER>0001104659-12-063550.hdr.sgml : 20120914
<ACCEPTANCE-DATETIME>20120914164906
ACCESSION NUMBER:		0001104659-12-063550
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20120912
FILED AS OF DATE:		20120914
DATE AS OF CHANGE:		20120914

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MFS HIGH INCOME MUNICIPAL TRUST
		CENTRAL INDEX KEY:			0000845606
		IRS NUMBER:				043039022
		FISCAL YEAR END:			1130

	BUSINESS ADDRESS:	
		STREET 1:		500 BOYLSTON ST
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6179545000

	MAIL ADDRESS:	
		STREET 1:		500 BOYLSTON STREET
		STREET 2:		20TH FL LEGAL DEPT
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COLONIAL HIGH INCOME MUNICIPAL TRUST
		DATE OF NAME CHANGE:	19920703

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BED BATH & BEYOND INC
		CENTRAL INDEX KEY:			0000886158
		STANDARD INDUSTRIAL CLASSIFICATION:	RETAIL-HOME FURNITURE, FURNISHINGS & EQUIPMENT STORES [5700]
		STATE OF INCORPORATION:			NY
		FISCAL YEAR END:			0227

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05754
		FILM NUMBER:		121093203

	BUSINESS ADDRESS:	
		STREET 1:		650 LIBERTY AVENUE
		CITY:			UNION
		STATE:			NJ
		ZIP:			07083
		BUSINESS PHONE:		2013791520

	MAIL ADDRESS:	
		STREET 1:		715 MORRIS AVENUE
		CITY:			SPRINGFIELD
		STATE:			NJ
		ZIP:			07081
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>a4.xml
<DESCRIPTION>4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2012-09-12</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0000845606</issuerCik>
        <issuerName>MFS HIGH INCOME MUNICIPAL TRUST</issuerName>
        <issuerTradingSymbol>CXE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0000886158</rptOwnerCik>
            <rptOwnerName>BED BATH &amp; BEYOND INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>650 LIBERTY AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>UNION</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>07083</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>Former 10% Owner</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Municipal Auction Rate Cumulative Preferred</value>
            </securityTitle>
            <transactionDate>
                <value>2012-09-12</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>486</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>23750</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The reported securities were purchased by the issuer in a cash tender offer.</footnote>
        <footnote id="F2">Plus any accumulated but unpaid dividends.</footnote>
    </footnotes>

    <remarks>These Municipal Auction Rate Cumulative Preferred Securities represent the Reporting Person's combined holdings in two series of auction preferred securities of the Issuer, which are treated herein as one class of securities consistent with the Reporting Person's prior Section 16 filing made in respect of the Issuer.</remarks>

    <ownerSignature>
        <signatureName>Bed Bath &amp; Beyond Inc. By:/s/ Michael J. Callahan, Vice President</signatureName>
        <signatureDate>2012-09-14</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
