Revenue Act of 1918
The Revenue Act of 1918, 40 Stat. 1057, raised income tax rates once again. The bottom tax bracket was expanded but raised from 2% to 6%.
The act simplified the tax structure created by the 1917 act. Instead of applying a "like normal tax" and a "like additional tax" to the 1916 act normal tax and additional tax it created a single tax structure with a Normal Tax and a Surtax.
The top rate was increased to 77%, and applied to income above $1,000,000. The top rate of the War Revenue Act of 1917 had taxed all income above $2,000,000 at a 67% rate.
The act was applicable to incomes for 1918. For 1919 and 1920 the top normal tax rate was reduced from 12 percent to 8%. This reduced the top marginal tax rate that combined normal tax and surtax from 77% to 73%.
Even in 1918, only 5% of the population paid federal income taxes (up from 1% in 1913), and yet the income tax funded one-third of the cost of World War I.
Income Tax for Individuals
A Normal Tax and a Surtax were levied against the net income of individuals as shown in the following table.
| Revenue Act of 1918 Income Tax on Individuals | |||||
| Net Income (dollars) |
Normal Rate for 1918 (percent) |
Normal Rate for 1919, 1920 (percent) |
Surtax Rate (percent) |
Combined Rate for 1918 (percent) |
Combined Rate for 1919, 1920 (percent) |
| 0 | 6 | 4 | 0 | 6 | 4 |
| 4,000 | 12 | 8 | 0 | 12 | 8 |
| 5,000 | 12 | 8 | 1 | 13 | 9 |
| 6,000 | 12 | 8 | 2 | 14 | 10 |
| 8,000 | 12 | 8 | 3 | 15 | 11 |
| 10,000 | 12 | 8 | 4 | 16 | 12 |
| 12,000 | 12 | 8 | 5 | 17 | 13 |
| 14,000 | 12 | 8 | 6 | 18 | 14 |
| 16,000 | 12 | 8 | 7 | 19 | 15 |
| 18,000 | 12 | 8 | 8 | 20 | 16 |
| 20,000 | 12 | 8 | 9 | 21 | 17 |
| 22,000 | 12 | 8 | 10 | 22 | 18 |
| 24,000 | 12 | 8 | 11 | 23 | 19 |
| 26,000 | 12 | 8 | 12 | 24 | 20 |
| 28,000 | 12 | 8 | 13 | 25 | 21 |
| 30,000 | 12 | 8 | 14 | 26 | 22 |
| 32,000 | 12 | 8 | 15 | 27 | 23 |
| 34,000 | 12 | 8 | 16 | 28 | 24 |
| 36,000 | 12 | 8 | 17 | 29 | 25 |
| 38,000 | 12 | 8 | 18 | 30 | 26 |
| 40,000 | 12 | 8 | 19 | 31 | 27 |
| 42,000 | 12 | 8 | 20 | 32 | 28 |
| 44,000 | 12 | 8 | 21 | 33 | 29 |
| 46,000 | 12 | 8 | 22 | 34 | 30 |
| 48,000 | 12 | 8 | 23 | 35 | 31 |
| 50,000 | 12 | 8 | 24 | 36 | 32 |
| 52,000 | 12 | 8 | 25 | 37 | 33 |
| 54,000 | 12 | 8 | 26 | 38 | 34 |
| 56,000 | 12 | 8 | 27 | 39 | 35 |
| 58,000 | 12 | 8 | 28 | 40 | 36 |
| 60,000 | 12 | 8 | 29 | 41 | 37 |
| 62,000 | 12 | 8 | 30 | 42 | 38 |
| 64,000 | 12 | 8 | 31 | 43 | 39 |
| 66,000 | 12 | 8 | 32 | 44 | 40 |
| 68,000 | 12 | 8 | 33 | 45 | 41 |
| 70,000 | 12 | 8 | 34 | 46 | 42 |
| 72,000 | 12 | 8 | 35 | 47 | 43 |
| 74,000 | 12 | 8 | 36 | 48 | 44 |
| 76,000 | 12 | 8 | 37 | 49 | 45 |
| 78,000 | 12 | 8 | 38 | 50 | 46 |
| 80,000 | 12 | 8 | 39 | 51 | 47 |
| 82,000 | 12 | 8 | 40 | 52 | 48 |
| 84,000 | 12 | 8 | 41 | 53 | 49 |
| 86,000 | 12 | 8 | 42 | 54 | 50 |
| 88,000 | 12 | 8 | 43 | 55 | 51 |
| 90,000 | 12 | 8 | 44 | 56 | 52 |
| 92,000 | 12 | 8 | 45 | 57 | 53 |
| 94,000 | 12 | 8 | 46 | 58 | 54 |
| 96,000 | 12 | 8 | 47 | 59 | 55 |
| 98,000 | 12 | 8 | 48 | 60 | 56 |
| 100,000 | 12 | 8 | 52 | 64 | 60 |
| 150,000 | 12 | 8 | 56 | 68 | 64 |
| 200,000 | 12 | 8 | 60 | 72 | 68 |
| 300,000 | 12 | 8 | 63 | 75 | 71 |
| 500,000 | 12 | 8 | 64 | 76 | 72 |
| 1,000,000 | 12 | 8 | 65 | 77 | 73 |
- Exemption of $1,000 for single filers and $2,000 for married couples and head of family; $200 exemption for each dependent under 18.
Inflation-adjusted numbers
Corrected for inflation by CPI:
| 1918 dollars | 2005 dollars |
|---|---|
| $1,000,000 | $12,933,775 |
| $2,000,000 | $25,867,550 |
Notes
- ↑ Facsimile from Statutes at Large