How do I show/ invoice taxi fares?

You can track business miles or expenses, userbenfarrelly.

You can create an item or expense account which you'll use in creating a cheque or expense for your fares or use our Mileage tracking feature. Here's how to add your trip using mileage. 

1. Go to the Mileage menu.
2. At the upper-right hand, click Add trip.
3. Enter the information that has red asterisks.
4. Then, Submit.

For more details, you can use this link: Automatically track mileage in QuickBooks Online.

Let me know if you have othe questions. Take care and have a great day!