Saint Patrick's Day (Irish: Lá 'le Pádraig or Lá Fhéile Pádraig), colloquially - but to some a derogatory term - Paddy's Day, is the feast day which annually celebrates Saint Patrick (386-493), the patron saint of Ireland, on March 17. It is a national holiday in the Republic of Ireland (a bank holiday in Northern Ireland); the overseas territory of Montserrat; and the Canadian province of Newfoundland and Labrador.

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April Fools' Day or All Fools' Day, though not a holiday in its own right, is a notable day celebrated in many countries on April 1. The day is marked by the commission of hoaxes and other practical jokes of varying sophistication on friends, enemies and neighbors, or sending them on fools' errands, the aim of which is to embarrass the gullible. In some countries, April Fools' jokes (also called "April Fools") are only made before noon on 1 April

Tax returns in the United States are reports filed with the Internal Revenue Service (IRS) or with the state or local tax collection agency (California Franchise Tax Board, for example) containing information used to calculate income tax or other taxes. Tax returns are generally prepared using forms prescribed by the IRS or other applicable taxing authority.