How do i turn on billable expenses, so that I can assign a bill to a client? I do not have a choice in Settings for turn on billable expenses.

Great to have you here in the Community, mark.

Before anything else, know that QuickBooks Online (QBO) features may vary depending on which plan you're currently subscribed to. The billable expense tracking and management are available for QBO Plus and Advanced plans only. If you're currently subscribed to QBO Start or Essential plan, you may need to upgrade your subscription.

Going back, we can turn on billable expenses so that you can track and record them on your QBO account.

Here's how:
1. Go to the Gear icon (), then select Account and settings.
2. Click the Expenses tab
3. From the Bills and expenses section, select Edit ✎.
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. (Optional) Set up the following:

>Markup rate.

>Billable expense tracking.

>Sales tax charge.

6. Choose a Bill payment terms by clicking the dropdown arrow ( ▼ ).
7. Click Save.

Moreover, you can refer to Step 2 and Step 3 from this article if you need additional help entering billable expenses and adding them to your invoices in QBO.

In addition, I added an article to help you in case you need additional help with managing billing, payment, and subscription info in QuickBooks Online.

Feel free to reply to this thread if you have other expense management and QuickBooks-related concerns. We're here to assist you 24/7.