1- YOU CANNOT WORK AT ANOTHER JOB WHEN YOU ARE ON LEAVE.
If it is realized that an employee works at another job for a fee when he/she is on leave, the employer can get the fee for the leave back.

2- IT IS LEGALLY PROHIBITED EMPLOYEES TO WORK WHEN THEY ARE ON LEAVE.
The primary purpose of taking a vacation is getting rest.
As a result of that, it is legally prohibited employees to work when they are on paid annual leave.

3- IF YOU WORK WHEN YOU ARE ON LEAVE, YOU ARE OBLIGED TO GIVE THE FEE THAT IS PAID FOR THE LEAVE BACK.
If the primary employer determines that an employee work at another job for a fee, the primary employer may reclaim the fee that is paid for the leave from the employee.

4- IF YOU WORK WHEN YOU ARE ON LEAVE, YOU MIGHT BE DISMISSED WITHOUT COMPENSATION!
In compliance with article 25/II of the law no. 4857, the employer may dismiss the employee, in accordance with ‘’the employee’s abuse of employer’s trust, behaviors against integrity and loyalty’’ of the article (e) of segment titled ‘’the improper attitudes that are not conform to morals and goodwill’’ entered in the title called ‘’the immediate termination right of the employer for justifiable reasons’’.

5- THE RIGHT TO ANNUAL PAID LEAVE SHOULD BE AT LEAST 14.
The annual paid leave should be;
a) at least fourteen (14) days if the service period is between 1 and 5 (fifth year is included).
b) at least twenty (20) days if the service period is more than 5 years and less than 15 years.
c) at least twenty-six (26) days if the service period is more than 15 years (fifteenth year is included).

Source: The Labor Law no. 4857 (Article 58)