Open VAT Posting Setup and complete the TCA fields.
| Category | Meaning | Additional requirement |
| S | Standard-rated | UAE standard VAT rate |
| Z | Zero-rated | Zero VAT |
| E | Exempt | Exemption reason code |
| O | Out of scope | Zero VAT |
| AE | Reverse charge | Reverse-charge goods type |
| N | Margin scheme | Dedicated zero-VAT BC setup |
A blank TCA category currently derives:
- Positive VAT rate → S.
- Zero VAT rate → Z.
Do not rely on this derivation for exempt, out-of-scope, reverse-charge or margin-scheme lines.