Due date = the date at which something is due. É a tradução literal, amplamente usada. Veja:

Income Tax - Filing due date
Income Tax - Filing due date. Filing Deadline File your return as soon as you can after January 1, 2005, but not later than the filing deadline, April 15, 2005. ...
www.tax.state.ny.us/pit/income_tax_2004/due_date.htm

Export911 : Due Date Calculator, Final Date Calculation
Calculates the due date or final date in a specified lead time (number of days) commencing from a given date, for example 30 days from today or 60 days from ...
www.export911.com/convert/dueTlME.htm

Federal Transit Administration - Current International Public ...
... Current International Public Transit Tenders. International Mass Transportation Program. Current International Public Transit Tenders (By Due Date). ...
www.fta.dot.gov/initiatives_ tech_assistance/imtp/14670_ENG_HTML.htm