This is the interesting bit for those who take less than 2600ytl in rental income. Also for those who take more than that amount:
6. EXCEPTION IN RENTAL INCOME
If persons, who gain rental income from house, obtain income less
than the amount of exception that is established annually, they are not
required to file a tax declaration to tax offices.
If the rental income from house exceeds the amount specified
for exception, the amount of exception should be deducted from rental
income to be declared in the annual tax declaration.