Note: Tax rates include normal tax plus applicable surtaxes. Tax for 1923 was reduced 25 percent by credit or refund under the Revenue Act of 1924, so the IRS reports the top and bottom rates as 3% and 43.5% at http://www.irs.gov/pub/irs-soi/02inpetr.pdf. Last law to change rates was the Revenue Act of 1921."