The most lasting impact and significant change of the Act was indexing the tax code parameters for inflation starting in 1985. Six of the nine federal tax laws between 1968 and 1981 were tax cuts compensating for inflation driven bracket creep. Inflation was particularly high in the five years preceding the Act, and bracket creep alone caused federal individual income tax receipts to increase from 7.94% to over 10% of the GDP. Even after the Act was passed, federal individual income tax receipts never fell below 8.05% of the GDP. Combined with indexing, that eliminated the need for future tax cuts to address it.