Original sentence: During World War I, the top rate rose to 77%; after the war, the top rate was scaled down to a low of 25%.In the Internal Revenue Code of 1939, the top rate was 75%.It rose to a rate of 7% on incomes above $500,000
Edited sentence: During World War I, the top rate rose to 77% and the income threshold to be in this top bracket increased to $1,000,000 ($16 million 2007 dollars); after the war, the top rate was scaled down to a low of 25% and the income threshold for paying this rate fell to a low of $100,000 ($1 million 2007 dollars).From 1988-1990, the threshold for paying the top rate was even lower, with incomes above $29,750 to $32,450 ($51,000 2007 dollars) paying the top rate of 28% in those years.In the Internal Revenue Code of 1939, the top rate was 75% - applied to incomes above $5,000,000 ($75 million 2007 dollars).It rose to a rate of 7% on incomes above $500,000 ($10 million 2007 dollars).Since 1964, the threshold for paying top income tax rate has generally been between $200,000 and $400,000.The one exception is the period from 1982-1992 when the top income tax brackets were removed and incomes above around $100,000 (varies by year) paid the top rate.While the top rate remained high, the threshold for paying the top rate dropped fell to $200,000 from 1942-1947, before being raised to $400,000 in 1948