As a freelancer, there are a number of costs you need to consider for yourself. We mention the following: 

Meal costs | As an entrepreneur, you are responsible for your own meal. Sometimes the client may provide a meal (for a fee). 

Travel expenses | Keep in mind that travel expenses are included in the hourly rate. These costs are not reimbursed.

Parking costs | You may have to pay for parking at a client's location. In that case the parking costs of your car are for you. These costs are also included in the hourly rate. Note: parking costs are not tax deductible, unless you drive a company car.