Summary
If you make 491,400,000 LL a year living in Lebanon, you will be taxed 105,920,000 LL. That means that your net pay will be 385,480,000 LL per year, or 32,123,333 LL per month. Your average tax rate is 21.6% and your marginal tax rate is 25.0%. 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 25 LL, hence, your net pay will only increase by 75 LL.
Bonus Example
A 1,000 LL bonus will generate an extra 750 LL of net incomes. A 5,000 LL bonus will generate an extra 3,750 LL of net incomes.