Answer:
Proportional tax system
Step-by-step explanation:
A proportional tax system levies an equal tax rate on everyone regardless of their income level. It is also known as the flat-rate tax because it treats the wealthy, middle class, and low-income earners equally. The proportional tax system simplifies tax filing as the same tax rate will apply to everyone.
The proportions tax system contrasts with the progressive tax system, which bases the tax rate on the taxpayer's income.