While you are on your trek, all expenses will be handled by your guide except for souvenirs and alcohol. In general, in Norway, tipping is not as common as in North America. If you would like to tip your shuttle drivers, 50 to 100 NOK (Norwegian Kroners) would be a fair tip.
For tipping your guides, tipping is completely discretionary but always appreciated. Tips enable them to make a livable wage while providing an outstanding experience to others. The industry recommendation is a range between $200-$500 USD for a full week of guiding.
If you have two guides, typically they will split the tip evenly. Please ensure that you have cash in Norwegian Kronor (NOK) or USD for tipping guides.