-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 DNEoKWHNMDFGZHSVMCbQm20DLjsPk3Q0OvMTWFyGUhtGDMQ9xcNqOFFhcDM/SrNh
 MNvoWuDi9gaKmwbzON+Cew==

<SEC-DOCUMENT>0000065103-06-000132.txt : 20060427
<SEC-HEADER>0000065103-06-000132.hdr.sgml : 20060427
<ACCEPTANCE-DATETIME>20060427130247
ACCESSION NUMBER:		0000065103-06-000132
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20060426
FILED AS OF DATE:		20060427
DATE AS OF CHANGE:		20060427

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			MORRIS EVERETT L
		CENTRAL INDEX KEY:			0001141987

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	811-06416
		FILM NUMBER:		06784125

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		6092822000

	MAIL ADDRESS:	
		STREET 1:		800 SCUDDERS HILL ROAD
		CITY:			PLAINSBORO
		STATE:			NJ
		ZIP:			08536

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			DTF TAX-FREE INCOME INC
		CENTRAL INDEX KEY:			0000879535
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				363793962
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	BUSINESS ADDRESS:	
		STREET 1:		55 EAST MONROE ST
		CITY:			CHICAGO
		STATE:			IL
		ZIP:			60603
		BUSINESS PHONE:		3122141250

	MAIL ADDRESS:	
		STREET 1:		100 MULBERRY STREET
		CITY:			NEWARK
		STATE:			NJ
		ZIP:			07102-4077

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	DUFF & PHELPS UTILITIES TAX FREE INCOME INC
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2006-04-26</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000879535</issuerCik>
        <issuerName>DTF TAX-FREE INCOME INC</issuerName>
        <issuerTradingSymbol>DTF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001141987</rptOwnerCik>
            <rptOwnerName>MORRIS EVERETT L</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>800 SCUDDERS HILL ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>PLAINSBORO</rptOwnerCity>
            <rptOwnerState>NJ</rptOwnerState>
            <rptOwnerZipCode>08536</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares</value>
            </securityTitle>
            <transactionDate>
                <value>2006-04-26</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5600</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.35</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>46141</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F1"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">19,439 shares - direct ownership
25,852 shares - wifes account
850 shares - indirect ownership through deferred comp plan</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Jo Ann Carrell, Power of Attorney</signatureName>
        <signatureDate>2006-04-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
