Though not officially confirmed by the IR S, many articles have appeared in the media stating extending your tax returns does reduce your chances of IRS Audit. We have found that true in our 30 years of experience. Therefore, extending your return even though it might be completed might be an excellent idea.
Keep in mind an extension does not extend the time you must pay any taxes due from the regular 4/15 date. If you do not any taxes due, penalties and interest will accrue until any tax due for 2010 is paid in full.