A 33% "rate bubble" applied between $78,400 and $162,770 for married filing jointly, between $39,200 and $123,570 for married filing separately, between $47,050 and $97,620 for singles, and between $67,200 and $134,930 for heads of households, the purpose being to recapture the revenue that upper-income taxpayers had saved by applying the 15% rate."