Fiscal Drag
Fiscal drag is a concept where inflation and earnings growth may push more tax payers into higher tax brackets. Therefore fiscal drag has the effect of raising government tax revenue without explicitly raising tax rates.
This fiscal drag has the effect of reducing Aggregate Demand and becomes an example of deflationary fiscal policy. It could also be viewed as an automatic fiscal stabiliser because higher earnings growth will lead to higher tax and therefore moderate inflationary pressure in the economy.