Why is a sales tax increase a greater burden on low-income households than middle-class households?

A sales tax increase disproportionately affects low-income households because they spend a larger percentage of their income on taxable goods and services compared to middle-class households. While middle-class households may have more disposable income and can absorb the tax increase more easily, low-income families often struggle to meet basic needs, making the regressive nature of sales taxes more burdensome for them. As a result, low-income households feel a greater impact on their overall financial stability when sales tax rates rise.