Can I post a bill payment to the Supplier account when I am still waiting for the supplier invoice?

I'm delighted to see you in the Community, aliana. 

It's really important to stay on top of your supplier transactions so that your records stay nice and organized. Allow me to guide you on the proper way to handle your bill payment concern. 

With QuickBooks, you can record bills in advance and make payments towards them, even if you haven't received the supplier invoice yet. Let's create a vendor credit and then apply it to the bill. This way, the credit is accurately recorded in the expense account associated with the supplier

To enter the credit:

1. In QuickBooks Online (QBO), head to the New menu in the upper left and choose Supplier credit.
2. From the Supplier ▼ dropdown, select the vendor's name. 
3. Depending on how you record purchases, enter the Category details or Item details. 
4. Note: If you choose an inventory item, QuickBooks will put it back into inventory. If the item is defective or if you don’t want it added back to inventory, you can make an inventory adjustment.
5. Click the Save and close button.

To link the entries:

1. Go to the New menu in the upper left and choose Pay bills.
2. Select a bill you're working on from the list. You'll see the available credit with this supplier in the Credit Applied field.
3. Complete the rest of the fields.
4. Press the Save and close button. 
   
   You can browse through this article to learn about different methods of handling credits and payments: Enter supplier credits and refunds in QuickBooks Online. 
   
   Moreover, these resources cover a wide range of topics, including step-by-step instructions on recording bill payment cheques, making bill payments using credit or debit cards, and effectively managing other transactions related to vendors:
   
   

• How to pay a bill with a credit or debit card
• Enter bills and record bill payments in QuickBooks Online
• Learn the difference between bills, cheques, and expenses in QuickBooks Online
  
  

If you have any additional questions or concerns about posting a bill payment (waiting for the vendor invoice), just click the Reply button and tag my name. I'll make sure everything is taken care of for you, aliana.