Since 1955, "Tax Day" in the United States has been April 15, or the next business day if it falls on a weekend or holiday. Despite the fact that taxes are essentially due on the same day every year, many people still find themselves scrambling on April 14 to get their records together.
Fortunately, the Internal Revenue Service allows taxpayers to file for a six-month extension if they need more time to prepare their tax return. You can obtain an extension for any reason; the IRS grants them automatically as long as you complete the proper form on time. Check your state tax laws; some states accept IRS extensions while others require you to file a separate state extension form.