Is reporting violations and irregularities related to tax evasion in a company considered haram, especially given the opinions that consider taxes haram?

The ruling on the permissibility of reporting tax evasion depends on the ruling concerning taxes themselves. If taxes are rightfully imposed and spent in a rightful manner, then tax evasion is not permissible, and there is no prohibition against reporting evaders. However, if they are otherwise, then tax evasion is permissible, and reporting evaders is prohibited.