[legitster]

Sales tax is not regressive per se. It's just much less progressive than an income tax. Rich people still pay more overall since they spend more money.

An example of a regressive tax would be something like cigarette taxes - poor people would actually spend a larger share of their income since they are also more likely to smoke.

[CabSauce]

People with lower incomes do spend larger a portion of their money on things that incur sales tax.

Higher income people spend more of their money on investments and other assets.