Summary
If you make 31,091,592 LL a year living in Lebanon, you will be taxed 3,155,402 LL. That means that your net pay will be 27,936,190 LL per year, or 2,328,016 LL per month. Your average tax rate is 10.2% and your marginal tax rate is 12.1%. This marginal tax rate means that your immediate additional income will be taxed at this rate. For instance, an increase of 100 LL in your salary will be taxed 12.12 LL, hence, your net pay will only increase by 87.88 LL.
Bonus Example
A 1,000 LL bonus will generate an extra 879 LL of net incomes. A 5,000 LL bonus will generate an extra 4,394 LL of net incomes.