Slovakia · SK
The Slovak VAT number (IČ DPH)
Three numbers that get confused constantly — IČO, DIČ and IČ DPH — and only the last belongs on an invoice to another member state.
Format: SK + 10 digits
Example: SK2020677824
Issued by: the Financial Administration, on VAT registration.
The format
A Slovak VAT number always carries ten digits after the prefix, and the first two say what kind of taxpayer it is.
- SKThe country code.
- 20A legal person. Natural persons start 10, foreign entities 40.
- 20677824The remainder, including the check digit.
Those ten digits are the DIČ, the tax identification number. The whole number is divisible by eleven, which gives a cheap offline check against typing errors.
IČO, DIČ and IČ DPH
This is the one table worth knowing about Slovakia.
| Number | Format | Issued by | Who has one |
|---|---|---|---|
| IČO | 8 digits | Statistical Office | Every business |
| DIČ | 10 digits (starting 10 / 20 / 40) | Financial Administration | Every taxpayer |
| IČ DPH | SK + the same 10 digits | Financial Administration | Only VAT-registered businesses |
The crucial point is that the VAT number cannot be derived from the company number. It comes from the DIČ, which the tax office assigns independently of the register. That is what makes Slovakia a harder case than neighbouring Czechia, where the VAT number is simply CZ + IČO.
Finding the company
The registers
RPO, the Statistical Office’s register of legal persons, is free, has an open API and carries the name, seat, legal form and status; ORSR does the same for the commercial register. Both are searched by IČO or by name, not by VAT number — and since one does not derive from the other, a VAT number gets you nowhere near a record.
Financial Administration lists
The Financial Administration publishes a list of VAT payers and, more usefully, a list of risky entities. You can therefore confirm that a number belongs to a registered payer; you cannot get an address out of it.
VIES
Slovakia discloses both name and address through VIES, which makes it the only free route from a Slovak VAT number to a company. The address comes on three lines and the last one is often the word Slovensko — the country, not a town.
Slovakia-specific pitfalls
- The VAT number is not the IČO with a prefix. That is the commonest wrong assumption; it holds in Czechia and not in Slovakia.
- IČ DPH is not the same thing as DIČ. The digits match, but every taxpayer has a DIČ and only VAT-registered businesses have an IČ DPH.
- The first two digits are meaningful: 10 for a natural person, 20 for a legal person, 40 for a foreign entity registered in Slovakia.
- The registers are keyed by IČO, so there is no direct path into them from a VAT number.
- The last address line in VIES is often "Slovensko" — the country, and not a city.
One API for 27 member states
Vatlas turns a European VAT number into a company record: legal name, national identifier, legal form, status and address. Same call, same shape, for Slovakia and for the other twenty-six.
curl "https://api.vatlas.dev/v1/vat/SK2020677824" \
-H "Authorization: Bearer $VATLAS_KEY"Response:
200 OK
{
"data": {
"vatNumber": "SK2020677824",
"countryCode": "SK",
"nationalNumber": "2020677824",
"nationalId": null,
"name": "Žilinská univerzita v Žiline",
"legalForm": null,
"status": "active",
"address": {
"line1": "Univerzitná 8215/1",
"line2": null,
"postalCode": "01026",
"city": "Žilina",
"country": "SK"
}
},
"meta": {
"origin": "vies",
"source": "VIES",
"sourceUpdatedAt": "2026-08-28T10:17:09.172Z",
"checked": ["database", "VIES"]
}
}meta.origin says where the answer came from: database for a register imported locally, source for a national API queried live, vies as a last resort. The shape of the response never changes from one country to the next.
Free to try. An email address creates an account — no credit card, no sales call — with 100 requests a month and a working key in about a minute.
Frequently asked
The Slovak VAT number in short
How many digits does a Slovak VAT number have?
Ten after the SK prefix — twelve characters in total.
What is the difference between IČO, DIČ and IČ DPH?
The IČO comes from the Statistical Office and every business has one. The DIČ comes from the Financial Administration and every taxpayer has one. The IČ DPH is that same ten-digit number with SK in front, and only VAT-registered businesses have it.
Can I compute the VAT number from the IČO?
No. It comes from the DIČ, which the tax office assigns independently of the company register, and no calculation links the two.
What do the first two digits mean?
The type of taxpayer: 10 for a natural person, 20 for a legal person, 40 for a foreign entity registered in Slovakia.
Why does VIES reject an existing Slovak company?
Because it is not VAT registered. It has an IČO and a DIČ, but no IČ DPH has been issued to it.
VAT numbers in other countries
Last updated 28 August 2026.