The deadline for filing Iowa state taxes is typically April 30 following the end of the tax year. For individual income tax returns, this means that residents must submit their returns by this date to avoid penalties and interest. However, if April 30 falls on a weekend or a holiday, the deadline may be extended to the next business day. It is important to stay informed about any changes to tax deadlines that might occur due to special circumstances. Additionally, taxpayers may also qualify for an automatic extension to file their tax returns, which generally provides an extra six months, but any taxes owed would still need to be paid by the original deadline to avoid penalties. For the most accurate and updated information regarding tax deadlines, it is advisable to visit the current Iowa Department of Revenue website.