If I may ask, would you like the recipient of the goods and services to be responsible for paying the VAT rates for RCT? Secondly, are you referring to how you can attach a credit note to your customer's invoice?
In QuickBooks Online (QBO), taxes are applied to invoices based on the settings you configured for your business and customers. If you want for your customers to be accountable for RCT, you can create an invoice and set the amounts as Out of Scope. This won't calculate and won't let you pay taxes. You can also put a note on the actual invoice where taxes have already been paid by your customer for reference in the future. I've added this screenshot where you can select the Out of Scope option:
Afterward, when your customer receive the products and services, you can have them account for the VAT by applying it to the invoice. They can specify whether the amounts are Exclusive of Tax (tax added on top) or Inclusive of Tax (taxes already included in the total).
On the other hand, when you say "attaching", are you referring to linking a credit note to an invoice? If that's the case, you can apply a credit note when recording a payment for the invoice. If both the invoice and credit note have already been created, they will appear as options once you receive the payment. You'll only have to click both the invoice and credit note to apply the credit. I've added this for you:
Now you know how taxes work and how a credit note applies to your invoice, you're all set and already have an idea about this. However, if you're referring to something else, reach out to us. We're always here to help you.
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