Why does some mileage have a dollar value potential deduction and others that I have entered have zero deduction?

Let me help with your question about tracking trips in QBO, hoeksema-nichola.

QBO will not put a potential deduction unless a trip has reached a minimum distance of 0.01 km. Aside from that, the trips should also be tagged as Business trips. You can review the details in the Distance column and check if the information is correct. 

Let me share these articles for more details:

• Automatically Track Mileage in QuickBooks Online
• Fix Mileage Tracking Issues in the QuickBooks Online Mobile App

If you're not getting any potential deductions for trips are more than 0.01 km, I would recommend reaching out to our chat support team. They can help you review the recorded trips and help you further with this. 

Go to this article to get their contact details: QuickBooks Online Support.

You'll want to check out this article as well for additional references when working in the program: Get Started with QuickBooks Online.

Please know that we're just around the corner if you have more questions for us. We're always here to help.