This is not working; THANK YOU to anyone kind enough to point out what's missing.
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<field h="5.293mm" name="IncomeTotal" w="19.134mm" x="54.478mm" y="126.775mm">
<ui>
<textEdit>
<border hand="right" presence="hidden">
<?templateDesigner StyleID aped0?></border>
<margin/>
</textEdit>
</ui>
<font size="11pt" typeface="Myriad Pro"/>
<para vAlign="middle"/>
<traversal>
<traverse ref="TextField4[3]"/>
</traversal>
<sum(IncomeTotal [Income1, Income2, Income3, Income4, Income5, Income6, Income7, Income8, Income9])>
</field>