The Federal tax filing deadline for regular 2006 tax returns is Tuesday, April 17, 2007, not Monday, April 16, 2007. Same for the state deadline here in New Jersey, and maybe your state, too. Why? Here’s the IRS’s answer:
Why are taxpayers getting extra time to file and pay?
Taxpayers will have extra time to file and pay because April 15 falls on a Sunday in 2007, and the following day, Monday, April 16, is Emancipation Day, a legal holiday in the District of Columbia.
By law, filing and payment deadlines that fall on a Saturday, Sunday or legal holiday are timely satisfied if met on the next business day. Under a federal statute enacted decades ago, holidays observed in the District of Columbia have an impact nationwide, not just in D.C. Under recently enacted city legislation, April 16 is a holiday in the District of Columbia. The IRS recently became aware of the intersection of the national filing day and the local observance of the new Emancipation Day holiday after most forms and publications for the current tax filing season went to print.
Individuals in the District of Columbia, as well as in six eastern states, already had an April 17 filing date prior to this announcement because they are served by an IRS processing facility in Massachusetts, where Patriots Day will be observed on April 16. These individuals are still required to file on April 17.
[link] IRS Q and A page about the April 17 deadline.