When you sell a house with land, who is responsible for the 2% taxes and duties to be paid for the transfer of ownership? The buyer or the seller or is it up to what both parties agree upon? What is the most common way? Thanks

Up to you as they say.

You see a lot of split 50/50 ads around.

And then there is possible taxes for the seller, capital gains and that. I would not participate on someones tax payments but then again i've seen people splitting this as well 50/50.