VIES VAT Number Validation: How to Check an EU VAT Number (2026)

What Is VIES? Why It Matters

VIES (VAT Information Exchange System) is the EU's real-time database connecting all 27 Member States' VAT registers. It lets you verify if a VAT number is valid and active at the moment of check.

When to Check Before Invoicing

• Every cross-border B2B invoice (services + goods)
• Every intra-community acquisition (goods received from EU)
• Before issuing first invoice to new EU customer
• Quarterly for recurring customers (status changes)
• Before filing EC Sales List (ZM/DES/ESL)

Manual VIES Check: Step-by-Step

Method 1: Official EU VIES Portal

1. Open ec.europa.eu/taxation_customs/vies/
2. Select Member State (customer's country) from dropdown
3. Enter VAT number (without country prefix — the portal adds it)
4. Enter your VAT number (requester — optional but recommended for audit trail)
5. Click Verify
6. Save result: Screenshot (PrtScn) or "Print to PDF" — include timestamp

Method 2: Our VAT Validator (Format Check + VIES Lookup)

1. Open vat-validator
2. Enter the VAT number with country prefix (for example, DE123456789)
3. Run the format check, then the optional live VIES lookup
4. Results show format validity first, then the live VIES registration status where available
5. Save the result (screenshot or PDF) with its timestamp for your records

Advantage: format errors are caught before the lookup, and you keep the dated result as evidence of the status you relied on.

Interpreting VIES Results

What "Valid" Doesn't Guarantee

• Customer is actually the holder (could be stolen number)
• Customer is VAT-compliant (filing returns, paying VAT)
• Transaction is legitimate (could be carousel fraud)

Bottom line: a "Valid" result confirms registration status on the check date. Whether reverse charge or an exemption applies follows Articles 196 and 138 and national rules - not the check result.

EU VAT Number Formats (For Pre-Check)

Before VIES, verify format locally. Our VAT Validator does this automatically.

Batch Validation: For 50+ Customers

Option 1: Our VAT Validator (One Number at a Time)

Our validator checks a single number's format and then queries VIES live. It does not batch-process lists or export CSV files - for each customer, save the result yourself (screenshot or PDF with timestamp) and log it in your own records.

Option 2: VIES API (For Developers)

EU provides SOAP API at: `https://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl`

Python Example:

import zeep
from datetime import datetime

client = zeep.Client('https://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl')

def check_vat(country_code, vat_number):
    try:
        result = client.service.checkVat(countryCode=country_code, vatNumber=vat_number)
        return {
            'valid': result.valid,
            'name': result.name,
            'address': result.address,
            'timestamp': datetime.utcnow().isoformat()
        }
    except Exception as e:
        return {'error': str(e), 'timestamp': datetime.utcnow().isoformat()}

# Batch check
customers = [('DE', '123456789'), ('FR', '12345678901'), ('IT', '12345678901')]
for cc, vn in customers:
    print(check_vat(cc, vn))

Option 3: Commercial Services (High Volume)

Audit Trail: What to Keep

How long records must be kept depends on the country - commonly six to ten years for VAT documents. Confirm your national retention period rather than assuming a single figure.

Per Customer Validation Record

Folder Structure (Recommended)

/VIES_Audit/
  /2026/
    /Q1/
      vies_FR12345678901_20260115.pdf
      vies_DE123456789_20260115.pdf
      batch_check_20260115.csv
    /Q2/
      vies_FR12345678901_20260415.pdf
      batch_check_20260415.csv
  /2025/
    ...
  master_validation_log.xlsx

Master Log Spreadsheet Columns

Date | VAT Number | Country | Customer Name | VIES Result | Screenshot File | Invoices | Re-check Due | Notes

Handling Common VIES Errors

1. "Member State not responding" (Timeout)
   • Retry at 30-min intervals (max 3 attempts)
   • Check VIES availability page for known outages
   • If down > 4 hours: charge domestic VAT, document all attempts
   • Re-check next business day
2. "Invalid" but customer insists it's correct
   • Ask customer for: VAT certificate (issued by their tax office)
   • Check format matches country pattern (table above)
   • Common issues: missing leading zero (BE), wrong prefix (EL vs GR), new registration not yet synced
   • New registrations: can take 2-4 weeks to appear in VIES
3. Name/address mismatch
   • VIES returns registered name/address — may differ from trading name
   • If legal entity matches: OK (e.g., "Müller GmbH" vs trading "Müller Consulting")
   • If completely different entity: potential fraud — investigate
4. Northern Ireland (XI) numbers
   • Prefix XI (not GB) for NI businesses under Protocol
   • Check on VIES with Member State = "Northern Ireland"
   • GB numbers (Great Britain) no longer on EU VIES post-Brexit
5. Group VAT registrations
   • Some countries allow group registration (single VAT ID for multiple entities)
   • VIES shows group head — subsidiaries may not appear individually
   • Ask for group confirmation letter

Automation: Build It Into Your Workflow

Pre-Invoice Validation (ERP/Accounting Integration)

1. Customer master data: store VAT number + last VIES check date
2. Before invoice creation: if last check > 90 days → auto-validate
3. If VIES invalid → block invoice, alert AR team
4. Log everything to audit table

Quarterly Batch Re-Check (Cron Job)

# Pseudocode for quarterly job (runs 1st of Jan/Apr/Jul/Oct)
customers = db.query("SELECT vat_number, country FROM customers WHERE cross_border = true")
results = []
for c in customers:
    result = vies_check(c.vat_number, c.country)
    results.append({
        'vat_number': c.vat_number,
        'country': c.country,
        'valid': result.valid,
        'checked_at': now(),
        'previous_valid': c.last_vies_valid
    })
    # Alert if status changed from valid to invalid
    if c.last_vies_valid and not result.valid:
        alert_slack(f"⚠️ VIES INVALID: {c.vat_number} was valid, now invalid!")
    db.update(c.id, last_vies_check=now(), last_vies_valid=result.valid)

export_csv(results, f'vies_batch_{now().date()}.csv')

EC Sales List Pre-Flight Check

Before filing ZM/DES/ESL:

1. Export all cross-border invoices for period
2. Extract unique customer VAT numbers
3. Run batch VIES validation
4. Any invalid? Fix before filing (amend invoice, contact customer)
5. File ESL only with VIES-validated numbers

Real-World Workflow: Monthly VIES Routine

Scenario: German Agency, 50 EU Clients

Tools for VIES Validation

VIES Compliance Checklist

Per New Cross-Border Customer

• [ ] Obtain VAT number with country prefix
• [ ] Verify format matches country pattern
• [ ] Check VIES (manual or batch)
• [ ] Save screenshot/PDF with timestamp
• [ ] Log in master validation spreadsheet
• [ ] Set re-check reminder: 90 days
• [ ] Apply the treatment the rules require for your transaction - a "Valid" result alone does not decide it

Monthly

• [ ] Run batch VIES on all active cross-border customers
• [ ] Flag any status changes (Valid → Invalid)
• [ ] Contact affected customers immediately
• [ ] Update master log
• [ ] Archive batch CSV

Quarterly (Before ESL Filing)

• [ ] Batch validate all period cross-border customers
• [ ] Resolve any invalid before filing
• [ ] File ZM/DES/ESL
• [ ] Archive: ESL confirmation + VIES batch CSV

Annually

• [ ] Review master log: any customers not re-checked in 12 months?
• [ ] Verify VIES screenshots readable (PDF not corrupted)
• [ ] Update country format patterns if EU publishes changes
• [ ] Test API/automation still working