The due date for filing your Arkansas Individual Income Tax return is April 15. If April 15 falls on a weekend or a holiday, your return is due on the next business day. If you file a federal or State of Arkansas Extension and you file your return before the deadline, you will not be charged for any late filing penalties for filing the tax return past the original due date. Interest and any applicable failure to pay penalty will be charged on all tax due returns from the original due date until the date you file the income tax return.

However, I just talked with the AR Income Tax and they did clarify they are moving this to follow Federal Guidelines of April 18th.