Can I match an expense to an outstanding invoice?

 I'm here to show you how to match an expense to an outstanding invoice, @qb19. 

Yes, you can match an expense to an outstanding invoice. This must be a billable expense.

First, you'll have to turn on the billable expense tracking from your account's Account and settings. Once done, when you create an expense, click the Billable checkbox.

A billable cost is one that you spend on behalf of your customer when you do work for them.

If you're subscribed to QuickBooks Online Plus and haven't turned on this feature yet, follow the steps below: 

1. Go to the Gear icon (⚙) and proceed to the Account and settings.
2. Click the Expenses tab.
3. From the Bills and expenses section, click the Edit icon (✎).
4. Turn on the following:
   • Show Items table on expense and purchase forms
   • Track expenses and items by customer.
   • Make expenses and items billable.
5. Select Save and then Done.

Then, here's how to enter an expense and set it as billable:

1. Go to the + New button and choose Expense. 
2. Select the payee.
3. In the Category column, select the expense account for the transaction.
4. Enter the description and amount of the expense, then click the Billable checkbox.
5. In the Customer column, select the customer you want to bill for this expense.
6. Click Save and close.

To edit an existing expense: 

1. Go to the Expenses tab and click to open the expense that you'd like to match. 
2. Select the Billable checkbox beside the Amount column.
3. Click Save and close once you're done. 

To link the billable expense to your customer's invoice:

1. Go to the + New button and select Invoice.
2. Find the customer where you've added this billable expense. This opens the Add to invoice window.
3. Select Add on the billable expense you want to charge to your customer.
4. Click on Save and close.

For more information about recording billable expenses and linking them to an invoice, refer to this article: Enter billable expenses.

Once you've received the payment from your customers, refer to this article on how to record it in your account: Record invoice payments in QuickBooks Online.

To review the income and expenses for each customer, run the Income by Customer Summary report from the Reports menu. See this article for more information on how to generate and customise the said report: Run reports in QuickBooks Online. 

Know that you can always drop by here if you need help matching an expense to an outstanding invoice. I will be happy to assist you further. Have a wonderful day!