QuickBooks Online automatically sets up a list of common VAT codes for you, based on where your company is located. The rate is used to calculate the appropriate VAT for each transaction or each item in the invoice.
Each rate links to a specific box of the VAT return. To know more about how VAT works in QuickBooks Online, you can go through the following articles below. These will provide you additional details on how to add, group, and track your taxes/vats
Keep in touch if you have any other VAT concerns, I'll be around to help. Have a great day!
Rounding off on invoice prices in QuickBooks Online is a default feature in the program. As a workaround, I'd suggest entering the exact amount to avoid rounding off the transaction values.
To make things accurate, you can delete and recreate the invoice, and manually enter the value (547.58) so you could match the customer's payment. Alternatively, you can create a journal entry to resolve the balance of 0.01.
However, using this method (journal entry) needs the assistance of an accounting professional for the accounts you need to use. Also, your accountant can help and guide on which account to debit and credit.
For your reference, you can go through this article: Create invoices in QuickBooks Online. This will provide you information on how to send an invoice link to your customers.
Feel free to reach out again if you have any questions about QuickBooks. I'll be right here to help.
The solution to entering the exact amount to avoid rounding off the transaction values or to delete and recreate the invoice, and manually enter the value (547.58) so we could match the customer's payment are not suitable for us due to the fact that we will need to perform one of this two operations for tens of invoices which are not matching. Maybe in the meantime due to the acquisition/merging there will be some steps in direction that both software to process the information in the same way.