<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2022-03-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001604174</issuerCik>
        <issuerName>Eagle Point Credit Co Inc.</issuerName>
        <issuerTradingSymbol>ECC</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001740874</rptOwnerCik>
            <rptOwnerName>OA Eagle Group Investors, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 MONROE AVE NW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GRAND RAPIDS</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>49503</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Remarks below</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001741110</rptOwnerCik>
            <rptOwnerName>OA Eagle Group Investors II, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 MONROE AVE NW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GRAND RAPIDS</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>49503</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Remarks below</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001741108</rptOwnerCik>
            <rptOwnerName>Ottawa Avenue Private Capital, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>200 MONROE AVE NW</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>GRAND RAPIDS</rptOwnerCity>
            <rptOwnerState>MI</rptOwnerState>
            <rptOwnerZipCode>49503</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Remarks below</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2022-03-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>362</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>14.02</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>470386</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Consists of 185 shares of common stock, par value $0.001 per share (&quot;Common Stock&quot;) of Eagle Point Credit Company Inc. (the &quot;Issuer&quot;) sold by OA Eagle Group Investors, LLC (&quot;OAEG&quot;) and 177 shares of Common Stock sold by OA Eagle Group Investors II, LLC (&quot;OAEG II&quot;).</footnote>
        <footnote id="F2">Represents 239,895 shares of Common Stock directly owned by OAEG and 230,491 shares of Common Stock directly owned by OAEG II.</footnote>
        <footnote id="F3">Ottawa Avenue Private Capital, LLC (&quot;Ottawa&quot;) is the manager of OAEG and OAEG II and may be deemed for purposes of Section 16 of the Securities Exchange Act of 1934, as amended (the &quot;Act&quot;), to be the indirect beneficial owner of some or all of the shares of Common Stock owned by OAEG and OAEG II.</footnote>
        <footnote id="F4">Dynasty Financial II, LLC (&quot;Dynasty&quot;) is the sole member of OAEG and Dynasty and Ottawa Avenue GP Investment Partners II, LP (&quot;OAGP&quot;) are the members of OAEG II. Each of Dynasty and OAGP may be deemed for purposes of Section 16 of the Act, to be the indirect beneficial owner of some or all of the shares of Common Stock owned by OAEG and OAEG II.</footnote>
    </footnotes>

    <remarks>The Reporting Persons are affiliated persons of an investment adviser of a registered closed-end investment company. This Form 4 is being filed by the joint filers pursuant to Rule 30h-1 of the Investment Company Act to satisfy the requirements of Section 30(h) of the Investment Company Act.</remarks>

    <ownerSignature>
        <signatureName>/s/ Randall Damstra, Chief Executive Officer</signatureName>
        <signatureDate>2022-03-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Randall Damstra, Chief Executive Officer</signatureName>
        <signatureDate>2022-03-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Randall Damstra, Chief Executive Officer</signatureName>
        <signatureDate>2022-03-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
