How are sales tax similar to a flat tax?

Sales tax and a flat tax both apply a consistent rate to a specific base, resulting in a uniform percentage levied on transactions or income. Both systems are straightforward and easy to administer, as they do not vary based on individual circumstances. Additionally, they are designed to be transparent, allowing individuals to easily understand how much tax they are paying based on their purchases or earnings. However, while sales tax is typically applied to consumption, a flat tax is usually applied to income.