Why are regressive taxes considered heaviest on low income taxpayers?

Regressive taxes, such as sales taxes or flat taxes, take a larger percentage of income from low-income taxpayers compared to high-income earners. This is because low-income individuals spend a higher proportion of their earnings on necessities, making these taxes a more significant financial burden for them. As income decreases, the relative impact of these taxes increases, leading to greater economic strain on lower-income households. Consequently, regressive taxes exacerbate income inequality and limit financial mobility.