Question

Why french government increase taxes

Answer 1

To meet its regular expenses, such as the cost of maintaining an army, the court, running government offices or universities.

Answer 2

The reason behind French government to increase the taxes was to acquire the fund from the citizens of the country.  

When Louis took the charge of the state he found that the government has not sufficient fund to meet the expenses of army, court, government, machinery and etc. In order to meet the expenses and maintain the services of the army, court, machinery and etc, he increases the taxes. The people included in the third estate (the bourgeoisie, the peasants, and everyone else in France) were liable to paid taxes to the government.