House Republicans have made key changes to the internal rulebook that governs how the chamber operates in a subtle move that could have far reaching implications.

The rules package, approved Tuesday by House GOP leaders, has received much attention for the Republicans’ decision to direct the Congressional Budget Office and the Joint Tax Committee to use “dynamic scoring” to determine the fiscal impact to federal coffers of major legislation. “Major” legislation is classified as anything deemed such by the chairman of the Budget Committee or that has a .25 percent impact on gross domestic product.