I wanted to know whether tax evasion is haram or not. I have an income set up by the employer to come to me every month so that the employers tax is reduced, although I do not work for the employer. Is this acceptable? Can I use this money in a halal manner or what can I do with this money?

It is not permissible for a Muslim to receive wages and subsidy through illegal means, and other similar methods, for example, by giving false information to the authorities.

https://www.sistani.org/english/book/46/2051/