How much gratuity (tip) should you leave for the waiter (the tip is based on the bill before tax is added)?

Most people tip between 15 and 20%.

To determine how much gratuity to leave for the waiter, you typically base it on the bill before tax is added. Here are the steps to calculate the tip:

1. Determine the tip percentage: The usual range for tipping is around 15-20% of the pre-tax bill amount. The actual percentage depends on factors such as the quality of service, the type of establishment, and personal discretion.

2. Calculate the pre-tax tip amount: Multiply the pre-tax bill amount by the tip percentage. For example, if the bill amount is $50 and you want to leave a 20% tip, the calculation would be: $50 x 0.20 = $10.

3. Round up or down: Determine whether you want to round the tip amount up or down to the nearest whole number. This step is optional, but some people prefer to round up for convenience or to be more generous. In the previous example, if you chose to round up, the tip amount would be $11.

4. Add the tip to the pre-tax bill amount: Add the pre-tax tip amount to the pre-tax bill amount to get the total amount that you will be paying. If the pre-tax bill amount was $50 and the pre-tax tip amount was $10, the total amount payable would be $60.

Remember, it's important to be mindful of local customs and norms regarding tipping in different countries or regions, as they might vary.