All other things being equal, the federal income tax ignores whether the taxpayer lives in a relatively affordable or expensive location. This approach can lead to unfairness; moreover, special deductions for the taxpayer’s actual living expenses, such as home mortgage interest and state and local taxes, do not solve the problem. Tax law scholars have generally been quick to dismiss the equity issues based on assumptions about taxpayer mobility. The existing literature would tax comparable workers equally, regardless of salary and living costs. This approach would unfairly equate differently situated workers. This Article questions the assumption of taxpayer mobility, considers the equity issues associated with failure to index the tax system properly, and assesses potential solutions.