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Doubt anyone will respond unless we know what the issues are. There is the standard advice to not bring info not applicable to the issue the IRS raised as that might minimize the chances that the IRS will then raise other issues
Bring all documents to support his income and deduction. If they are honest errors, he needs to amend the filing in order to satisfy the IRS. Otherwise it would not go down well.
Comments
http://www.politifact.com/truth-o-meter/promises/trumpometer/promise/1421/release-his-tax-returns-after-audit-completed/
Don't lie to the Feds. Period. Ask Richard Nixon. Ask Martha Stewart. Oh, and they never, ever forget anything. Nothing.
and so it goes,
peace,
rono
However, if your colleague is in really deep doo-doo, there is one other approach which may (or may not) work.