How do I chsnge ABN to ACN in my settings and invoices Because I trade with company name, now

I got an idea on how we can get around with your concern, userali.

QuickBooks Online requires the Australian Business Numbers (ABN) when setting up your company. These numbers are used when you file your taxes to Australian Taxation Office (ATO).

1. Click the Gear icon in the upper-right corner and select Account and settings.
2. Select the Company tab and go to the Company name section.
3. Enter the ABN number and click Save.
4. Select Done.

Since you already have the Australian Company Numbers (ACN), you can easily apply for a new ABN online via the Australian Taxation Office (ATO) website. You can browse this article to know more about the process: What is an ABN?

Once you've acquired the ABN, you can already enter it in QuickBooks Online by following the steps I've shared above.

You can always get back to us if you have additional queries regarding the company settings and the required information. 

I very good attachment in this job

Hello, @Bakht1.

I can help you and answer any questions you may have about QuickBooks. However, I need to gather some information about your concern to ensure I can provide the best solution.

I'm looking forward to your reply. Thank you in advance, and have a great weekend.

shouldnt there be a acn and abn number on the invoice?

Let me share some information on adding customer ABN to your invoices in QuickBooks Online (QBO), Devon.

If you need to add the Customer ABN in an invoice, we'll need to enable GST in QBO. To enable GST:

1. Go to the GST tab.
2. Select Get started.
3. Select the taxes applicable to your business.
4. Select Save and finish.

Once done, go back to Custom form styles, and you'll now be able to see and tick the Custom ABN option to show on your invoices. Please follow the steps below to display the Customer's ABN number on the invoice: 

1. Click the Gear icon and select Custom Form Styles.
2. Select Edit on the Master Invoice (or the frequently used invoice template).
3. Hit the Content tab and then click the top box of the preview page.
4. Underneath the Header, tick the box for the Australian business number (ABN).
5. Scroll down and tick the box beside Customer ABN under the Display sub-menu.
6. Press Done.

 Then, open the invoice and select the correct template. Click on Print or Preview, and the customer ABN number should be visible. If it still isn't visible, create a new invoice template and check if the same issue occurs. 

Feel free to post any follow-up questions here or start a new thread if you need additional assistance down the road. The Community is always available to make sure all your QuickBooks needs are taken care of.