1A standard rate of pay, before additions are made for overtime, etc.; also, the standard rate charged for a service, before discounts or supplementary charges.
2A rate of tax, fixed between the lower and higher bands of income tax rates, which is paid by the majority of taxpayers of average income.
Origin
Late 19th century.
Definition of basic rate in US English:
basic rate
noun
1A standard rate of pay, before additions are made for overtime, etc.; also, the standard rate charged for a service, before discounts or supplementary charges.
2A rate of tax, fixed between the lower and higher bands of income tax rates, which is paid by the majority of taxpayers of average income.