TAB key is usually used to indent/outdent a text/paragraph/bulleted lists and numbered lists. In Confluence editor, this key does not apply for indenting unless it is used with bulleted lists and numbered lists. To apply this onto a plain text/paragraph, as a workaround you can make use of Indent User Macro. I've tested this out in Confluence 5.1.3 and it works just fine.
Hope that helps.
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