 The government 's income came from five principal sources : regular taxes , occasional taxes , fines , income taxes , miscellaneous taxes and tributes from feudatories . An emergency tax was imposed occasionally and were applicable when the kingdom was under duress , such as when it faced natural calamities , or was preparing for war or overcoming war 's ravages . Income tax included taxes on crown land , wasteland , specific types of trees considered valuable to the economy , mines , salt , treasures unearthed by prospectors . Additionally , customary presents were given to the king or royal officers on such festive occasions as marriage or the birth of a son . 
