Deadlines to be filed in 2009 for the 2008 tax year Individual Tax Returns: April 15th - 1040 Federal Income tax return April 20th - N-11 State of Hawaii Income tax return October 15th - Federal extensions due October 20th - Hawaii extensions due Corporation Tax Returns: March 16th - 1120/1120S U.S. Corporation Income Tax Return March 20th - N-30 Hawaii Corporation Income Tax Retrun September 15th - Corporate Federal extension due September 20th - Corporate Hawaii extension due Partnership Tax Returns: April 15th - 1065 U.S. Return of Partnership Income April 20th - N-20 Hawaii Partnership Return of Income September 15th - Partnership Federal extension due September 20th - Partnership Hawaii extension due Limited Liability Company Tax Returns: Single member LLC has the same tax deadlines as the Individual Tax Returns listed above. Multiple member LLC has the same tax deadlines as the Partnership Tax Returns listed above unless you have elected to be treated as a Corporation, in which you would have the same deadlines as the Corporation Tax Returns listed above. General Excise / Use Tax Returns: G-45 General Excise/Use Periodic Tax Return is due 20 days after your filing period (monthly, quarterly, semi-annually). G-49 Annual Return & Reconciliation of General Excise/Use Tax Return is due April 20th *There may be other tax deadlines not listed above depending on your business and personal situation.