1 Jan 2010

26 Jan 2010

3 Feb 2010

17 March 2010 etc....

Coloumn L needs to show the current month payment due date. For example based on the above data if in June spreadsheet payment dates would be

1 June 2010

26 June 2010

3 June 2010

17 June 2010 etc...

If a Start date falls after the current month then the formulae should return 'Not Due' i.e. if the month sheet is Feb but the start date is 17 March 'Not Due' is returned...

Any help would be greatly appreciated....