1. Poll tax. Everyone pays the same amount. What could be fairer than this?!
England tried it in the late 14th century, leading in 1381 to Wat Tyler's Rebellion. Six hundred years later, England tried it again, leading to the Poll Tax Riots.
2. Sales tax. Goods are taxed at a flat rate (often 17 to 20 percent in Europe, and 5 to 8 percent in various American jurisdictions). Because the wealthy spend a smaller fraction of their income on taxable goods than do the poor, this tax is less progressive than a flat income tax.