The IRS has shortened the extension period from 6 to 5 months for Partnerships (including Limited Liability Companies filing as partnerships), and Estates/Trusts that file Form 1041. This one-month reduction is effective for returns due on or after January 1, 2009. Note that the original due date of April 15th (for calendar year taxpayers) has not been changed. Thus, the new law changes the extended due date to September 15th, rather than October 15th. The rationale for the earlier due date is that this will allow individual taxpayers to receive their Schedule K-1s in advance of the October 15th extended filing deadline for individual income tax returns.