April 15th, the traditional income tax filing deadline, fell on a Saturday this year. So, the Internal Revenue Service and state Department of Revenue have given taxpayers until midnight tonight to file. Michael Devine, an IRS Spokesman for Kansas and Missouri, says government likes to do its work on business days, Monday to Friday, so a weekend deadline was out. Devine says the number of Missourians filing electronically grows each year. He adds anyone who owes money but can’t afford to pay it all must at least file by midnight tonight to avoid late filing penalties. Devine says about 35 to 40 percent of Missouri taxpayers usually put off filing their returns until the last two weeks of the filing season.