-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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 /Z+8HQHw1dLojutWsP1+7w==

<SEC-DOCUMENT>0001204716-03-000005.txt : 20030612
<SEC-HEADER>0001204716-03-000005.hdr.sgml : 20030612
<ACCEPTANCE-DATETIME>20030612151310
ACCESSION NUMBER:		0001204716-03-000005
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20030606
FILED AS OF DATE:		20030612

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			CHEWENS MICHAEL J
		CENTRAL INDEX KEY:			0001204716

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-14703
		FILM NUMBER:		03742132

	BUSINESS ADDRESS:	
		STREET 1:		52 S BROAD ST
		CITY:			NORWICH
		STATE:			NY
		ZIP:			13815
		BUSINESS PHONE:		6075476068

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NBT BANCORP INC
		CENTRAL INDEX KEY:			0000790359
		STANDARD INDUSTRIAL CLASSIFICATION:	NATIONAL COMMERCIAL BANKS [6021]
		IRS NUMBER:				161268674
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		52 S BROAD ST
		CITY:			NORWICH
		STATE:			NY
		ZIP:			13815
		BUSINESS PHONE:		6073372265

	MAIL ADDRESS:	
		STREET 1:		52 S. BROAD STREET
		CITY:			NORWICH
		STATE:			NY
		ZIP:			13815
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>

<ownershipDocument>

    <documentType>4/A</documentType>

    <periodOfReport>2003-06-06</periodOfReport>

    <dateOfOriginalSubmission>2003-06-10</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000790359</issuerCik>
        <issuerName>NBT BANCORP INC</issuerName>
        <issuerTradingSymbol>NBTB</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001204716</rptOwnerCik>
            <rptOwnerName>CHEWENS MICHAEL J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>  </rptOwnerStreet1>
            <rptOwnerStreet2>  </rptOwnerStreet2>
            <rptOwnerCity>  </rptOwnerCity>
            <rptOwnerState>  </rptOwnerState>
            <rptOwnerZipCode>  </rptOwnerZipCode>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Senior Executive V.P.</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>NBT Bancorp Inc. Common Stock</value>
        </securityTitle>
        <transactionDate>
            <value>2003-06-06</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>M</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>2900</value>
            </transactionShares>
            <transactionValue>
                <value>10.1563</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
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        </transactionAmounts>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>3311.79</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
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    </nonDerivativeSecurity>

    <nonDerivativeSecurity>
        <securityTitle>
            <value>NBT Bancorp Inc. Common Stock</value>
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        <transactionDate>
            <value>2003-06-06</value>
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        <transactionCoding>
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            <transactionCode>S</transactionCode>
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        <transactionTimeliness>
            <value></value>
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        <transactionAmounts>
            <transactionShares>
                <value>2900</value>
            </transactionShares>
            <transactionValue>
                <value>19</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
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        <postTransactionAmounts>
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            </sharesOwnedFollowingTransaction>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </nonDerivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>10.1563</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>1996-01-23</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>7779.24</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>1997-01-23</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2006-01-23</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>7779.24</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>7779.24</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>10.1563</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2003-06-06</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>4</transactionFormType>
            <transactionCode>M</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value></value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>2900</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>D</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>1997-01-23</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2006-01-23</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>2900</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>4879.24</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>11.6424</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>1997-01-28</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>8952.3</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>1998-01-28</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2007-01-28</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>8952.3</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>8952.3</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>14.3492</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2002-01-28</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>29900</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2003-01-28</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2012-01-28</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>29900</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>29900</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>14.88</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>2000-01-24</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>18800</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2001-01-24</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2010-01-24</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>18800</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>18800</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>16.0625</value>
        </conversionOrExercisePrice>
        <transactionDate>
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        <transactionCoding>
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        <transactionTimeliness>
            <value>E</value>
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        <transactionAmounts>
            <transactionShares>
                <value>25600</value>
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            <transactionValue>
                <value>0</value>
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            <transactionAcquiredDisposedCode>
                <value>A</value>
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        </transactionAmounts>
        <exerciseDate>
            <value>2002-01-22</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2011-01-22</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>25600</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>25600</value>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
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    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>18.1632</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>1998-01-27</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>9261</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>1999-01-27</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2008-01-27</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>9261</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>9261</value>
            </sharesOwnedFollowingTransaction>
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        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <derivativeSecurity>
        <securityTitle>
            <value>Non-Qualified Stock Option (right to buy)</value>
        </securityTitle>
        <conversionOrExercisePrice>
            <value>20.5952</value>
        </conversionOrExercisePrice>
        <transactionDate>
            <value>1999-01-26</value>
        </transactionDate>
        <transactionCoding>
            <transactionFormType>5</transactionFormType>
            <transactionCode>A</transactionCode>
            <equitySwapInvolved>0</equitySwapInvolved>
        </transactionCoding>
        <transactionTimeliness>
            <value>E</value>
        </transactionTimeliness>
        <transactionAmounts>
            <transactionShares>
                <value>9660</value>
            </transactionShares>
            <transactionValue>
                <value>0</value>
            </transactionValue>
            <transactionAcquiredDisposedCode>
                <value>A</value>
            </transactionAcquiredDisposedCode>
        </transactionAmounts>
        <exerciseDate>
            <value>2000-01-26</value>
            <footnoteId id="F1"/>
        </exerciseDate>
        <expirationDate>
            <value>2009-01-26</value>
        </expirationDate>
        <underlyingSecurity>
            <underlyingSecurityTitle>
                <value>NBT Bancorp Inc. Common Stock</value>
            </underlyingSecurityTitle>
            <underlyingSecurityShares>
                <value>9660</value>
            </underlyingSecurityShares>
        </underlyingSecurity>
        <postTransactionAmounts>
            <sharesOwnedFollowingTransaction>
                <value>9660</value>
            </sharesOwnedFollowingTransaction>
        </postTransactionAmounts>
        <ownershipNature>
            <directOrIndirectOwnership>
                <value>D</value>
            </directOrIndirectOwnership>
        </ownershipNature>
    </derivativeSecurity>

    <footnotes>
        <footnote id="F1">Pursuant to NBT Bancorp Inc. 1993 Stock Option Plan grant vests 40% for first year, 20% annually for following years.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Michael J. Chewens</signatureName>
        <signatureDate>2003-06-10</signatureDate>
    </ownerSignature>

</ownershipDocument>

</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----