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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-07-23</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001839439</issuerCik>
        <issuerName>PAYCOR HCM, INC.</issuerName>
        <issuerTradingSymbol>PYCR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001777951</rptOwnerCik>
            <rptOwnerName>Pride Aggregator, LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O APAX PARTNERS US, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>601 LEXINGTON AVENUE, 53RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001861008</rptOwnerCik>
            <rptOwnerName>APAX IX GP CO. Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>THIRD FLOOR ROYAL BANK PLACE</rptOwnerStreet1>
            <rptOwnerStreet2>1 GLATEGNY ESPLANADE</rptOwnerStreet2>
            <rptOwnerCity>ST PETER PORT</rptOwnerCity>
            <rptOwnerState>Y7</rptOwnerState>
            <rptOwnerZipCode>GY1 2HJ</rptOwnerZipCode>
            <rptOwnerStateDescription>GUERNSEY</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001860993</rptOwnerCik>
            <rptOwnerName>PRIDE GP, INC.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O APAX PARTNERS US, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>601 LEXINGTON AVENUE, 53RD FLOOR</rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10022</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-07-23</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>3787</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>141093953</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares transferred from Pride Aggregator, LP (&quot;Pride Aggregator&quot;) to former holders of Paycor HCM, Inc. (the &quot;Issuer&quot;) preferred stock for no consideration in connection with the completion of the Issuer's initial public offering. The transferred shares remain subject to customary lock-up restrictions through January 17, 2022.</footnote>
        <footnote id="F2">Consists of shares held directly by Pride Aggregator. Pride GP, Inc. is the general partner of Pride Aggregator and Apax IX GP Co. Limited (&quot;Apax IX GP&quot;) is the sole shareholder of Pride GP, Inc.</footnote>
        <footnote id="F3">Apax IX GP is the investment manager of the relevant investment vehicles in the fund known as Apax IX and is controlled by a board of directors consisting of Simon Cresswell, Andrew Guille, Martin Halusa, Paul Meader and David Staples. The registered address for Apax IX is Third Floor Royal Bank Place, 1 Glategny Esplanade, St Peter Port, Guernsey GY1 2HJ.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Jason Wright, Director of Pride GP, Inc., the general partner of Pride Aggregator, LP</signatureName>
        <signatureDate>2021-07-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Jason Wright, Director of Pride GP, Inc.</signatureName>
        <signatureDate>2021-07-27</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>/s/ Andrew Guille, Director of Apax IX GP Co. Limited</signatureName>
        <signatureDate>2021-07-27</signatureDate>
    </ownerSignature>
</ownershipDocument>
