The purpose of tax is not to raise money to government, but to redistribute wealth. The government prints money to cover the bill of its expenditure. If it issued no taxes, then that burden would fall on all people through inflation, affecting the poor moreso than the rich. Taxes are an issue separate from spending that allows the government to move money down from rich to poor, and in doing so offset the inflationary effects of spending. This is why tax is a solution to rent. Rent is poor people giving money to rich people, and tax allows you to reverse that flow.