Does not the verse 9:5 entail that the government cannot introduce and impose any taxes other than the zakah? The verse reads: If they have repented by establishing the Prayer and paying the Zakah leave their way.
This verse defines the limits of law making by any act of parliament as well. Any parliament cannot change the basics of law and order and cannot change the basics of charity and at the same time, cannot change the “get out of the way” instruction and keep getting into the way of the people with different agenda.
This follows that parliament cannot form any welfare financial institution. For that it will need money and as parliament cannot change the basics of charity or raise money for any other agenda, so it will become practically impossible for parliament to do anything for the welfare of underprivileged.