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In fact, it wasn’t even introduced as a concept until about 100 years into the country’s history after President Abraham Lincoln signed the very first federal income tax—a 3% flat tax on incomes exceeding $800—to fund the Civil War.—Jake Angelo, Fortune, 13 Mar. 2026 And those who relocate to Greece can take advantage of a 7 percent flat tax rate for up to 15 years.—Lydia Mansel, Travel + Leisure, 7 Mar. 2026 In Michigan, a ballot measure endorsed by the state’s board of education called Invest in MI Kids would scrap its flat tax and include an additional 5% tax on those claiming over $500,000 (or $1 million for joint filers) in income to fund public education.—Gordon Ebanks, CNN Money, 17 Feb. 2026 Italy is in the throes of a private membership boom to cater to a growing wave of wealthy investors due to the flat tax of 100,000 euros a year with no limits to residency that was introduced by former Prime Minister Matteo Renzi.—Sofia Celeste, Footwear News, 4 Feb. 2026 See All Example Sentences for flat tax