<SEC-DOCUMENT>0000940394-19-000490.txt : 20190301
<SEC-HEADER>0000940394-19-000490.hdr.sgml : 20190301
<ACCEPTANCE-DATETIME>20190301094905
ACCESSION NUMBER:		0000940394-19-000490
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190301
DATE AS OF CHANGE:		20190301
EFFECTIVENESS DATE:		20190301

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			EATON VANCE SENIOR INCOME TRUST
		CENTRAL INDEX KEY:			0001070732
		IRS NUMBER:				043435040

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-227968
		FILM NUMBER:		19647030

	BUSINESS ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		617-482-8260

	MAIL ADDRESS:	
		STREET 1:		TWO INTERNATIONAL PLACE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>evfsaisupp.htm
<DESCRIPTION>EATON VANCE SENIOR INCOME TRUST SAI SUPP DTD 3-1-2019
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<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>EATON VANCE SENIOR INCOME TRUST</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>Supplement to Statement of Additional Information
dated February 28, 2019</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 0; text-align: left"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0"><B>The following is added to the tables under &#8220;Portfolio
Managers.&#8221; in &#8220;Investment Advisory and Other Services&#8221;:</B></P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0; text-align: center">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 80%; font: 10pt NewsGoth Lt BT; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 27%; padding-top: 3pt; padding-bottom: 3pt; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 14%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Number of</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">All Accounts</FONT></TD>
    <TD STYLE="width: 16%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Total Assets of</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">All Accounts</FONT></TD>
    <TD STYLE="width: 20%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Number of Accounts</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Paying a Performance Fee</FONT></TD>
    <TD STYLE="width: 23%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Total Assets of Accounts</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Paying a Performance Fee</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 13.7pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Andrew Sveen*</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 2.9pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Registered Investment Companies</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">3</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;1,994.9</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;0</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 2.9pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Other Pooled Investment Vehicles</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;0</FONT></TD></TR>
<TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 2.9pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Other Accounts</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">0</FONT></TD>
    <TD STYLE="padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif; font-size: 9pt">&#9;$&#9;0</FONT></TD></TR>
</TABLE>
<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.5in; text-indent: -0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 8pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">*</TD><TD>As of December 31, 2018</TD></TR></TABLE>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.5in; text-indent: -0.5in">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" ALIGN="CENTER" STYLE="width: 80%; font: 10pt NewsGoth Lt BT; border-collapse: collapse">
<TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 32%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 2.9pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Portfolio Managers</FONT></TD>
    <TD STYLE="width: 30%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Dollar Range of Equity Securities</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Beneficially Owned in the Fund*</FONT></TD>
    <TD STYLE="width: 38%; border-bottom: Black 1pt solid; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Aggregate Dollar Range of Equity</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">Securities Beneficially Owned</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">in all Registered Funds in</FONT><BR>
<FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">the Eaton Vance Family of Funds*</FONT></TD></TR>
<TR>
    <TD STYLE="vertical-align: bottom; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; padding-left: 13.7pt"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">&#8195;Andrew Sveen</FONT></TD>
    <TD STYLE="vertical-align: top; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">None</FONT></TD>
    <TD STYLE="vertical-align: bottom; font: 9pt/10pt NewsGoth XCn BT; padding-top: 3pt; padding-bottom: 3pt; text-align: center"><FONT STYLE="font-family: Arial Narrow, Helvetica, Sans-Serif">$100,001 - $500,000</FONT></TD></TR>
</TABLE>
<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.5in; text-indent: -0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 8pt Arial Narrow, Helvetica, Sans-Serif; margin-top: 3pt; margin-bottom: 3pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">*</TD><TD>As of December 31, 2018. Mr. Sveen became a portfolio manager effective March 1, 2019.</TD></TR></TABLE>

<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.5in; text-indent: -0.5in">&nbsp;</P>

<P STYLE="font: 9pt Arial, Helvetica, Sans-Serif; margin: 3pt 0 3pt 0.5in; text-indent: -0.5in">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">&nbsp;</P>

<P STYLE="font: 10pt Arial, Helvetica, Sans-Serif; margin: 3pt 0">March 1, 2019</P>


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