The outstanding balance is added onto the next trip you take on Uber. This can be added to a cash or wallet paid trip. Your new ride invoice will give you the breakup of the fare including the outstanding amount from the previous trip.
How do I pay unfinished payments on Uber?
Short answer:You can pay any outstanding amounts on the website or app. Log in and choose Account from the menu. If you have an outstanding amount owing, you'll see this in the 'Account' section of the website or app. You'll see that your account is 'Arrears' and how much you owe.