1. Spent on goods or services
2. Spent on rent
3. Spent on capital purchases
4. Spent on debt repayment or other forms of financing
In fact income tax does not have the last two points that you admit are bad, so maybe we should eliminate income tax and use corporate tax only?
The thing is low corporate taxes create an inequality between labor and capital gains. It's already the case that wealth inequality is quite unrelated to income inequality, the highest wealth individuals often don't register in the high income brackets.