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

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-05-04</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001584207</issuerCik>
        <issuerName>OneMain Holdings, Inc.</issuerName>
        <issuerTradingSymbol>OMF</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001706059</rptOwnerCik>
            <rptOwnerName>Hicks George G</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744510</rptOwnerCik>
            <rptOwnerName>Varde SFLT, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001704881</rptOwnerCik>
            <rptOwnerName>Varde Fund XII G.P., L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001704967</rptOwnerCik>
            <rptOwnerName>Varde Fund XII UGP, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744511</rptOwnerCik>
            <rptOwnerName>Varde Credit Partners Master, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744512</rptOwnerCik>
            <rptOwnerName>Varde Credit Partners G.P., L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001744513</rptOwnerCik>
            <rptOwnerName>Varde Specialty Finance Fund G.P., L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001745095</rptOwnerCik>
            <rptOwnerName>Varde Specialty Finance Fund U.G.P., LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001138267</rptOwnerCik>
            <rptOwnerName>VARDE PARTNERS LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001054846</rptOwnerCik>
            <rptOwnerName>VARDE PARTNERS INC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>901 MARQUETTE AVE. S., SUITE 3300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MINNEAPOLIS</rptOwnerCity>
            <rptOwnerState>MN</rptOwnerState>
            <rptOwnerZipCode>55402</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>1</isOther>
            <otherText>See Footnote (1)</otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-05-04</value>
            </transactionDate>
            <deemedExecutionDate></deemedExecutionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>S</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>1901638</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>51.7613</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7552292</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnote</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">The shares of common stock, par value $0.01, of OneMain Holdings, Inc. (the &quot;Issuer&quot;) reported as beneficially owned are held of record by OMH Holdings, L.P. (&quot;Holdings&quot;) or its subsidiaries. Each Reporting Person may be deemed an indirect beneficial holder of shares of common stock of the Issuer. Each Reporting Person disclaims beneficial ownership of any shares of the Issuer's common stock owned of record by Holdings or its subsidiaries, in each case, except to the extent of any pecuniary interest therein, and this report shall not be deemed an admission that any such entity is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>GEORGE G. HICKS, By: /s/ George G. Hicks</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VARDE SFLT, L.P., By: The Varde Specialty Finance Fund G.P., L.P., By: The Varde Specialty Finance Fund U.G.P., LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE VARDE FUND XII G.P., L.P., By: The Varde Fund XII UGP, LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE VARDE FUND XII UGP, LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VARDE CREDIT PARTNERS MASTER, L.P., By: Varde Credit Partners G.P., L.P., By: Varde Credit Partners UGP, LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VARDE CREDIT PARTNERS G.P., L.P., By: Varde Credit Partners UGP, LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE VARDE SPECIALTY FINANCE FUND G.P., L.P., By: The Varde Specialty Finance Fund U.G.P., LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>THE VARDE SPECIALTY FINANCE FUND U.G.P., LLC, By: Varde Partners, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VARDE PARTNERS, L.P., By: Varde Partners, Inc., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>VARDE PARTNERS, INC., By: /s/ David A. Marple, Name: David A. Marple, Title: General Counsel</signatureName>
        <signatureDate>2021-05-06</signatureDate>
    </ownerSignature>
</ownershipDocument>
