When an image is sold, we pay the full amount to the photographer, without any tax deducted. When it comes to tax, it is the responsibility of the photographer to make sure this is paid on their income from Picfair.
How different income is taxed is something that can change considerably from country to country. In most cases, sellers typically do not have to disclose additional income from image sales as income generated through such means, will most likely not meet the threshold for extra taxing.
We always recommend double-checking with your local taxing authority where you are based on whether tax from sales is applicable.