| Country | Format | Number of characters | Notes |
| Austria (AT) | U12345678 | 9 | The first character is always a U. |
| Belgium (BE) | 0123456789 | 10 | If you have a 9-digit number, prefix it with a 0. |
| Bulgaria (BG) | 1234567890 | 9 or 10 |
|
| Croatia (HR) | 12345678901 | 11 |
|
| Cyprus (CY) | 12345678X | 9 | The last character must be a letter. |
| Czech Republic (CZ) | 12345678
123456789
1234567890 | 8, 9 or 10 | If a contact provides you with 11, 12 or 13 numbers, delete the first three numbers as these are a tax code. |
| Denmark (DK) | 12345678 | 8 |
|
| Estonia (EE) | 123456789 | 9 |
|
| Finland (FI) | 12345678 | 8 |
|
| France (FR) | 12345678901
X1234567890
1X123456789
XX123456789 | 11 | Valid VAT numbers may have an alpha character as the first or second, or both. All alphabets are valid except I and O. |
| Germany (DE) | 123456789 | 9 |
|
| Greece (GR) | 012345678 | 9 |
|
| Hungary (HU) | 12345678 | 8 |
|
| Ireland (IE) | 1234567X
1X23456X | 8 | Includes one or two alpha characters as either the last or second and last character or last two characters. |
| Italy (IT) | 12345678901 | 11 |
|
| Latvia (LV) | 12345678901 | 11 |
|
| Lithuania (LT) | 123456789
123456789012 | 9 or 12 |
|
| Luxembourg (LU) | 12345678 | 8 |
|
| Malta (MT) | 12345678 | 8 |
|
| Netherlands (NL) | 123456789B01 | 12 | The tenth character is always a B and the 3-digit suffix is always in the range B01-B99. |
| Poland (PL) | 1234567890 | 10 |
|
| Portugal(PT) | 123456789 | 9 |
| Romania (RO) | 1234567890 | 2 – 10 | Minimum of two maximum of 10 |
| Slovak Republic (SK) | 1234567890 | 10 |
|
| Slovenia (SI) | 12345678 | 8 |
|
| Spain (ES) | X12345678
12345678X
X1234567X | 9 | The first or last, or first and last characters can be alpha characters. |
| Sweden (SE) | 123456789001 | 12 |
|
| UK (GB) | 123456789 | 9 |
|
CAUTION: