If you requested a six-month extension to file your 2011 income tax return, you face a major deadline on October 15. That’s the final date for filing your 2011 return; the IRS does not give filing extensions beyond that date. October 15 is also the deadline for undoing a 2011 conversion of a regular IRA to a Roth IRA. If you did a conversion to a Roth last year, you can switch it back to a