Sales taxes for example vary widely yet have minimal impact on low margin business. Lower them and customers save money but restaurants margins stay the same.
However this basically just seems like a Sales Tax to me, which we already have in most countries.
Personally I think it would be good to get rid of income and corporate taxes all together and replace it with a land value tax. So much more freedom, less regulation, and crazy tax loopholes.
If you make 1M and it costs you 400K to run your family, you pay on the 600K.
If you spend more than you earn, you carry forward the loss.
Land value tax makes sense on paper, but implementation is a huge question. Who decides the price, how often is it revised, how do you make it transparent? Maybe "solve" that issue with a trick: everyone decides their own value and thus their own tax, but whatever value they decide is a an offer to the market: if you think the person is underpricing their land, you can buy it from them at that price.
I have thought that valuating your own land could possibly work, but people would have to have a more detached sense of land/home ownership for that to work. People get emotionally attached to where they live, but maybe encouraging people to be less attached would help many current problems in society cause by NIMBY issues.