Summary
If you make 20,400,640 LL a year living in Lebanon, you will be taxed 1,770,064 LL. That means that your net pay will be 18,630,576 LL per year, or 1,552,548 LL per month. Your average tax rate is 8.7% and your marginal tax rate is 10.0%. 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 10 LL, hence, your net pay will only increase by 90 LL.
Bonus Example
A 1,000 LL bonus will generate an extra 900 LL of net incomes. A 5,000 LL bonus will generate an extra 4,500 LL of net incomes.