Focus on the pronunciation of marginal rate
English definition of “marginal rate”
noun [C] (also marginal tax rate, marginal rate of tax)
› ACCOUNTING, TAX the rate of tax paid on the last part of a person's or organization's income in a particular period: The law would have lowered the top marginal rate on income earned in the city. The higher marginal tax rate applies to individuals with more than $120,000 of net income. For most people, their marginal rate of tax will be higher when investing and lower when retired.