There is a tip line on the invoice, how do I turn off?I

Let me help you disable the tip line on your invoices, @Mar359.

Turning off this feature will also affect your sales receipt forms. To proceed, follow the steps below:

1. Go to the Gear icon, then Account and settings.
2. Select Sales.
3. In Sales form content, select Edit ✎.
4. Tick the Accept tips checkbox.
5. Press Save, then Done.

If you're using the new invoice layout, you can change it from there. Conveniently, you can turn tips on or off according to your customers. I'll show you how:

1. Navigate to + New, then select Invoice.
2. Tap Manage, then click Payment methods.
3. Switch Accept tips on or off for this invoice only.
4. You can also turn tips on or off for all future invoices. Under Accept tips, select Manage settings. Decide Who gets tipped, turn tips on or off, then Save.

If you'd like to change the default account for the tips, refer to this article for the instructions: Turn tips on or off for sales forms in QuickBooks Online.

I'm adding a reference to help you learn what more you can do with the sales forms: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Feel free to post again if you need more help with your invoices or receivables in the program. I'm only a post away. Have a wonderful day!