The government raises taxes and takes money out of the economy.
The companies and people have to pay more money in taxes so they have less money to spend elsewhere.
People will buy less with their less money.
Companies now bring in even less money due to sagging sales and higher taxes. So they order less materials and have to lay off people.
The companies who get the raw materials have less business and higher taxes, so they buy less capital equipment and lay off people.
Less taxes get paid into the government because there is less profit and less people working.
So the government raises taxes again and takes more money out of the economy.
It is really a simple concept.