Login in to Altinn and open your tax return. See how to log in.
1. Click Change
2. Click Change
3. Fill in Number of trips and km. The sum is automatically calculated
4. and 5. Take the scroll-bar to the bottom. Make deductions for road tolls/ferry
6. State the reason
7. Click OK
8. Make sure that the changes are shown
9. Click Save/Back to the list
10. The changes are shown in the main overview. You can change more items, or Start submissions.