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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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MIC-Info: RSA-MD5,RSA,
 EE3E4yshEQlwhZwe6jwVO7giFzRzWGH8a6X5h+uYViF5cvegewfzTpQPnqdjVIJ2
 aSR0fqTQcWuDH7LeR/PGeQ==

<SEC-DOCUMENT>0001198272-06-000194.txt : 20061208
<SEC-HEADER>0001198272-06-000194.hdr.sgml : 20061208
<ACCEPTANCE-DATETIME>20061208144341
ACCESSION NUMBER:		0001198272-06-000194
CONFORMED SUBMISSION TYPE:	5
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20061130
FILED AS OF DATE:		20061208
DATE AS OF CHANGE:		20061208

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			STEPHENS W THOMAS
		CENTRAL INDEX KEY:			0001196503

	FILING VALUES:
		FORM TYPE:		5
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-05901
		FILM NUMBER:		061265390

	BUSINESS ADDRESS:	
		STREET 1:		PUTNAM LLC
		STREET 2:		P O SQUARE L5
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
		BUSINESS PHONE:		6172921104

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PUTNAM INVESTMENT GRADE MUNICIPAL TRUST
		CENTRAL INDEX KEY:			0000855048
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				046629611
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		ONE POST OFFICE SQUARE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
		BUSINESS PHONE:		6172921000

	MAIL ADDRESS:	
		STREET 1:		ONE POST OFFICE SQU
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02109
</SEC-HEADER>
<DOCUMENT>
<TYPE>5
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>5</documentType>

    <periodOfReport>2006-11-30</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <form3HoldingsReported>0</form3HoldingsReported>

    <form4TransactionsReported>0</form4TransactionsReported>

    <issuer>
        <issuerCik>0000855048</issuerCik>
        <issuerName>PUTNAM INVESTMENT GRADE MUNICIPAL TRUST</issuerName>
        <issuerTradingSymbol>pgm</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001196503</rptOwnerCik>
            <rptOwnerName>STEPHENS W THOMAS</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Closed-End Fund</value>
            </securityTitle>
            <transactionDate>
                <value>2006-11-30</value>
                <footnoteId id="F1"/>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>5</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>8.9298</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>9.96</value>
                    <footnoteId id="F2"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>179.2107</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Dividends reinvested for fiscal year ended 11/30/2006</footnote>
        <footnote id="F2">price as of 11/30/06</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>W. Thomas Stephens</signatureName>
        <signatureDate>2006-12-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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