I recently had a bit of a surprise when I learnt of this IG, that there is tax on furniture. I bought a property and furnished it all in one go and found my weekly tax went from 600 to over 1600 and no warning I could see of such. It think it would make more sense for furniture just to be the expense that you want people to pay out for it and no tax, as they are already substantial investments.
If this is desired IC thing like some people have said, then at least make it clear by adding some information about it perhaps on the furniture store or property so its clear what the additional cost is. But it seems really strange to pay tax on furniture thats already expensive.
Property tax is currently 10%. If you don't like that, petition the Legates - who can change it.
This system itself is unlikely to change. Furniture is not that expensive now.