How long is a Slovak IBAN?

A Slovak IBAN is always exactly 24 characters. It starts with 'SK', followed by 2 check digits, a 4-digit bank code, a 6-digit account prefix (zero-padded), and a 10-digit account number. Example: SK31 1200 0000 1987 4263 7541.

What is the account prefix in a Slovak IBAN?

Slovak IBANs contain a 6-digit account prefix inherited from the domestic pre-IBAN format. For most retail accounts this is 000000, but corporate accounts use non-zero prefixes to indicate account type. The prefix must always be present and zero-padded to 6 digits when constructing the IBAN.

Is Slovakia part of SEPA?

Yes. Slovakia adopted the euro on 1 January 2009 and is a full SEPA member. All Slovak IBANs are accepted for SEPA Credit Transfers and Direct Debits. No BIC code is required for SEPA transfers — the IBAN alone is sufficient.

Slovakia IBAN Format (SK) — Structure, Length & Validator | ibanchecker.cash

The Slovakia IBAN is 24 characters long and follows the ISO 13616 standard. Slovakia adopted the euro in January 2009 and is a full SEPA member — all transfers within the 36-country SEPA zone can be initiated using the IBAN alone, without a BIC code. The Slovak IBAN encodes a 4-digit bank code, a 6-digit account prefix, and a 10-digit account number in a structure inherited from the pre-IBAN Slovak domestic system.

Slovakia IBAN at a Glance

Country code: SK
Total length: 24 characters (always)
Format: SKkk bbbb ssssss cccccccccc
BBAN length: 20 digits
Character types: digits only after the country code
Currency: Euro (EUR)
SEPA member: Yes (since 2009)

Slovakia IBAN Structure Explained

1. Country Code — SK (2 characters)

The ISO 3166-1 alpha-2 code for Slovakia. Every Slovak IBAN begins with SK.

2. Check Digits — kk (2 digits)

Two decimal digits computed using the MOD-97 algorithm defined in ISO 7064. They detect transposition and transcription errors.

3. Bank Code — bbbb (4 digits)

A 4-digit code assigned by Národná banka Slovenska (NBS) to each licensed bank. Common codes for major Slovak banks:

0200 — Všeobecná úverová banka (VUB)
0900 — Slovenská sporiteľňa (Erste Group)
1100 — Tatra banka
3000 — Slovenská záručná a rozvojová banka (SZRB)
6500 — Prima banka Slovensko

4. Account Prefix — ssssss (6 digits)

A 6-digit prefix inherited from the pre-IBAN domestic Slovak account number system. For most retail accounts this is 000000, but corporate and special-purpose accounts use non-zero prefixes to indicate the account type. The prefix must always be present and zero-padded to 6 digits.

5. Account Number — cccccccccc (10 digits)

The 10-digit domestic account number. Together with the prefix, this forms the full 16-digit account identifier used in Slovakia's domestic payment system.

Slovakia IBAN Example Explained

SK31 1200 0000 1987 4263 7541

Country: SK
Check digits: 31
Bank code: 1200 (Tatra banka — note: actual Tatra code is 1100; this is illustrative)
Account prefix: 000019
Account number: 8742637541

Second Example — Slovenská sporiteľňa

SK89 0900 0000 0051 2345 6789

Country: SK
Check digits: 89
Bank code: 0900 (Slovenská sporiteľňa)
Account prefix: 000000
Account number: 5123456789

How Slovak IBAN Validation Works

Country code check: First two characters must be exactly SK.
Length check: Total character count (spaces removed) must be exactly 24. Slovakia shares this length with Spain (ES24) and Saudi Arabia (SA24), but has a different internal structure.
Character type check: Positions 3–24 must all be decimal digits. Slovak IBANs are fully numeric after the country code.
MOD-97 check: Move the first four characters to the end, treat the result as a large number, divide by 97. Remainder must be 1.

The ibanchecker.cash validator validates Slovak IBANs and displays the bank code with the associated bank name in the result.

Slovakia Is a SEPA Country

Slovakia adopted the euro on 1 January 2009 and is a full SEPA member. All Slovak bank accounts accept SEPA Credit Transfers and SEPA Direct Debits across the 36-country SEPA zone:

No BIC required for SEPA transfers — the IBAN alone is sufficient
SEPA Credit Transfers settle by the next business day
SEPA Instant transfers settle in under 10 seconds at participating banks
Slovak IBANs work seamlessly with any EU payroll or invoicing system

Common Slovak IBAN Mistakes

Omitting the 6-Digit Prefix

The 6-digit account prefix is mandatory and must be present even when all zeros. Omitting it produces a 18-character IBAN instead of 24, which immediately fails the length check. When converting a domestic Slovak account number (format prefix-account/bankcode) to an IBAN, zero-pad the prefix to 6 digits.

Wrong Length — 22 or 26 Characters

Slovak IBANs are always 24 characters. A common mistake is confusing the structure with the Czech IBAN (also 24 characters) — the internal field layout differs even though both have similar 4-digit bank codes.

Validating Slovak IBANs in Bulk

Finance teams working with Central European suppliers can validate Slovak IBANs alongside Czech, Hungarian, and Polish ones using the ibanchecker.cash bulk checker. Upload a CSV with up to 100 IBANs and receive per-row validation with bank code and error details.

Last updated: June 2026