Hello @Osric_Powell
Can I just clarify a few points to make sure I understand correctly.
Is there a way to submit pro forma VAT invoices?
No, a Proforma invoice is like an estimate and is not picked up by the vat return.
We receive these from our investment supplier and historically have manually transferred the entries for our quarterly VAT into HMRC
So were you making manual adjustments to the return to the value of the proforma invoices?
Our VAT returns always have a zero balance as the VAT amount is withdrawn and paid to HMRC at source (by the investment supplier)
Are you trying to submit a nil return?