50/50 taxes/paying for who? Someone who makes $30k and someone who makes $300k might both only eat $10k of food a year, would the tax be a flat fee or a % of in

50/50 taxes/paying for who? Someone who makes $30k and someone who makes $300k might both only eat $10k of food a year, would the tax be a flat fee or a % of income? If it's a flat fee, it could be done as a business, akin to how costco works where they wholesale you food for a membership.