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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-12-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001836833</issuerCik>
        <issuerName>dMY Technology Group, Inc. IV</issuerName>
        <issuerTradingSymbol>PL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001623646</rptOwnerCik>
            <rptOwnerName>Weil Kevin</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLANET LABS PBC</rptOwnerStreet1>
            <rptOwnerStreet2>645 HARRISON STREET, FLOOR 4</rptOwnerStreet2>
            <rptOwnerCity>SAN FRANCISCO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94107</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President, Product &amp; Business</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-12-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1072287</value>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
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                <transactionAcquiredDisposedCode>
                    <value>A</value>
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                    <value>1072287</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
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        <derivativeTransaction>
            <securityTitle>
                <value>Earnout - Class A Shares</value>
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                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>304460</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
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            <expirationDate>
                <footnoteId id="F4"/>
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                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
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                    <value>304460</value>
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                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
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        </derivativeTransaction>
        <derivativeTransaction>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>9.75</value>
            </conversionOrExercisePrice>
            <transactionDate>
                <value>2021-12-07</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
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                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
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            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1685023</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F5"/>
                </transactionPricePerShare>
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                    <value>A</value>
                </transactionAcquiredDisposedCode>
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            <exerciseDate>
                <footnoteId id="F6"/>
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            <expirationDate>
                <value>2031-06-29</value>
            </expirationDate>
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                <underlyingSecurityTitle>
                    <value>Class A Common Stock</value>
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                <underlyingSecurityShares>
                    <value>1685023</value>
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                    <value>1685023</value>
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        </derivativeTransaction>
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    <footnotes>
        <footnote id="F1">Pursuant to the business combination (the &quot;Business Combination&quot;) of dMY Technology Group, Inc. IV and Planet Labs Inc. (&quot;Former Planet&quot;), each share of Former Planet capital stock (other than Class B common stock of Former Planet) was converted into the right to receive approximately 1.53184 shares (the &quot;Exchange Ratio&quot;) of the issuer's Class A common stock, par value $0.0001 per share (&quot;Class A Common Stock&quot;) at the closing of the business combination.</footnote>
        <footnote id="F2">Includes 1,072,287 restricted stock units (&quot;RSUs&quot;), each of which represent a contingent right to receive one share of issuer's Class A Common Stock. The RSUs will vest with respect to 25% of the RSUs on June 15, 2022 and in equal quarterly installments thereafter. The RSUs have no expiration date.</footnote>
        <footnote id="F3">Includes 1,072,287 RSUs.</footnote>
        <footnote id="F4">Includes 304,460 earnout shares that will vest in four substantially equal installments if the closing price of the issuer's Class A Common Stock equals or exceeds $15.00, $17.00, $19.00 and $21.00, over any 20 trading days within any 30 day trading period prior to December 7, 2026 or if the issuer consummates a change of control transaction prior to December 7, 2026 that entitles its stockholders to receive a per share consideration of at least $15.00, $17.00, $19.00 and $21.00. Issuable only if the holder continues to provide services to the issuer or its subsidiaries through the date on which the earnout shares are issued.</footnote>
        <footnote id="F5">At the closing of the Business Combination, each outstanding option to purchase Former Planet capital stock was converted into a right to receive a number of options to purchase Class A Common Stock based on the Exchange Ratio.</footnote>
        <footnote id="F6">The option vests and becomes exercisable with respect to 25% of the underlying Class A Common shares on April 5, 2022 and in equal monthly installments thereafter.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Andrew Kirkpatrick, as Attorney-in-fact for Kevin Weil</signatureName>
        <signatureDate>2021-12-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
