The designed purpose of the IRS is to raise funds for governance. It's been captured and drained of resources by the capital class so that it's actual operational purpose is making sure that rich people pay as few taxes as possible by looking the other way when they don't obey the law.
Yet another insurmountable bug in capitalism - those with the capital make the rules, and usually the new rules allow them to accumulate further capital. Rinse and repeat.
A super simple fix is to encourage the rich to have more children. If they have 6 children and divide their wealth 6 ways, that rebalances wealth inequality every generation.
Easy enough to do via tax policy too. Eg. 10% tax reduction per child.