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Why isn't money spent on necessities deductible from your taxes?
Another way to look at it is that deductibles are intended as incentives or subsidies to particular industries (in this case the healthcare industry). Guaranteeing a decent standard of living and making sure everybody can meet the costs of “necessities” can be achieved much more easily by a low tax rate on the first XXX$ of income and/or generic welfare benefits rather than any measure focused on making healthcare, food or whatnot cheaper or free under certain conditions. Incidentally, many countries do have different forms of benefits or tax breaks for accommodation-related expenses.