Why does it keep telling me that my billable expense account is not associated with an income account?? Everything looks as it should....

When you set a reimbursable expense account, in company settings there will be a choice to choose the associated income account, you must choose an income account.  I can not remember what section that is in though.

Welcome to the Community, @userfisetk01. I'm here to share some insights about the possible reason for the error message you're getting when entering a billable expense in QuickBooks Online (QBO).

It could be that the second option (In multiple accounts) when you turned on the Track Billable expenses and items as income in your company settings is chosen. 

If this is the case, you'll need to assign the desired billable expense account(s) to an income account. Here's how:

1. Go to the Gear icon at the top right.
2. Select the Chart of Accounts under Your Company column.
3. Locate the desired expense account and click Edit on the Run Report drop-down under the Action column.
4. Check the Use for billable expenses in the Account screen, then select the desired Income Account from the drop-down menu.
5. Click Save and close.

Once done, recreate the billable expense and save it. For more details, you can also check out these articles for further guidance:

• QuickBooks Online Sync Error: QuickBooks Online Business Validation Error: An account you chose for ....
• How to enter billable expenses.

I'm only a few clicks away if you have any additional questions about your billable expenses in QuickBooks. Have a good one.