For both Patriots' Day and Emancipation Day, special rules apply. For Emancipation Day, when April 15 falls on a Friday, tax returns are due the following Monday, April 18. For both Emancipation Day and Patriots' Day, when April 15 falls on a Saturday or Sunday, tax returns are due the following Tuesday, April 18 or April 17 respectively.[3][4] This means that when the tax filing deadline is not moved for other political reasons, tax day for any particular year is always on April 15 (years when this day is a Monday through Thursday), Tuesday April 17 (years when April 15 is a Sunday) or Monday or Tuesday April 18 (years when April 15 is either a Friday or Saturday).