Invoices carry a mix of 15 % standard, 0 % export and exempt lines alongside NHIL and GETFund surcharges — but the accounting system groups them together, causing the GRA return to diverge from the E-VAT ledger.
Per-line-item VAT rate with automatic levy split — NHIL, GETFund and COVID tracked separately — providing a GRA return structure that reconciles with E-VAT data by construction.

