# Austrian VAT Number (UID) Validator & VIES Check
> Instant sub-1ms offline checksum validation, syntax verification, and 2026 tax rate lookup for Austria (AT) VAT numbers.

- **Canonical URL:** https://stanzaapi.com/tools/vat-validator/vies/austria-at
- **Governing Standard:** EU Council Directive 2006/112/EC (European Commission Taxation & Customs Union (VIES))
- **Latency:** <1ms Edge
- **Privacy:** In-memory execution only (zero data stored or logged)

## Technical Overview & Governing Rules
In Austria, the Value Added Tax (VAT) identification number begins with the country prefix 'AT', followed by the national format: U followed by 8 digits.

The number format is governed by national tax authorities and verified via strict syntax and structural pattern matching.

For 2026 tax calculations, the standard VAT rate in Austria is 20%, with applicable reduced rates of 10%, 13%.

## Specification Matrix
| Parameter | Value | Details |
| --- | --- | --- |
| Country Prefix | AT | ISO 3166-1 alpha-2 / VIES code |
| Local Identifier Name | UID-Nummer | National statutory tax terminology |
| Format Structure | U followed by 8 digits | National syntax specification |
| Checksum Algorithm | Format & regex validation | Offline check digit formula |
| 2026 Standard VAT Rate | 20% | Standard statutory rate |
| 2026 Reduced VAT Rates | 10%, 13% | Applicable reduced & super-reduced rates |

## Standard JSON Response Model
```json
{
  "valid": true,
  "countryCode": "AT",
  "countryName": "Austria",
  "vatNumber": "AT123456789",
  "syntaxValid": true,
  "checksumValid": true,
  "rates": {
    "standardRate": 20,
    "reducedRates": [
      10,
      13
    ],
    "effectiveYear": 2026
  }
}
```

## Frequently Asked Questions & Edge Cases
### Q: What is the standard VAT rate in Austria for 2026?
**A:** The standard VAT rate in Austria is 20%. Certain qualifying goods and services are eligible for reduced rates of 10%, 13%.

### Q: What is the official structure of a Austria (AT) VAT number?
**A:** A valid Austria VAT number begins with the country code 'AT', followed by U followed by 8 digits. Known locally as UID-Nummer, it is used for domestic invoicing and intra-EU cross-border trade.

### Q: Can Austria VAT numbers be validated offline without VIES downtime?
**A:** Yes. Our API executes deterministic mathematical checksums and regex format rules at the Cloudflare edge in <1ms, shielding your checkout flow from slow or offline European Commission VIES servers.

### Q: How do I verify if a Austria company is eligible for cross-border zero-rated B2B invoicing?
**A:** Under EU Directive 2006/112/EC, intra-community supply of goods and services is zero-rated when both seller and buyer have valid VIES VAT registrations. Validating the Austria VAT check digit and syntax confirms compliance prior to transaction settlement.