By paying yourself with a salary via your company, you'd pay 10% revenue tax + health insurance (ЗО) + social insurance (ДЗПО, ДОО)... except the insurance part is capped on a maximum revenue of 3000 BGN or something like that... so as you make more money, your total tax rate converges to 10%.
Take these numbers with a grain of salt because I'm no accountant, but I know for sure your accountant is wrong, because I know how much tax I pay, and that's close to 11.5% total.