Possible Clues:

• Levy on departures, hence taxi and train are badly used
• Late cut imposed by government
• Levy that replaced death duty
• Something for those willing to pay
• Levy on dead person's estate
• Payment to state resulting from certain things of which Twain spoke?
• Ruin a next heir? It can
• Levy on late distribution of extra tea in most of China
• Impost one's willing to pass on
• It's the duty of all who succeed to be rich