The alcohol percentage of tequila can vary depending on the brand and country of origin. In Mexico, the minimum alcohol percentage for tequila to be commercialized is 35% ABV, and the maximum is 55% ABV. However, most tequilas have around 35-40% ABV. In the United States, Canada, and the UK, most tequilas are bottled at 80 proof, which is equivalent to 40% ABV. Some brands of tequila sold in Mexico have proofs ranging from 70 to 78, which is equivalent to 35 to 38% ABV. Therefore, the alcohol percentage of tequila can range from 35% to 40% ABV, depending on the brand and country of origin.