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San Marino

San Marino uses the Social Security Number (SSI Number / Codice ISS) as the personal TIN for individuals and the Tax Registration Number (COE / Codice Operatore Economico) for legal entities and economic operators.

SM SMR 2 TIN types Last reviewed 2026-06-05

TIN types

2 published formats. Open a type to see examples, structure details, and official sources.

Validate San Marino TIN
Sammarinese Social Security Number (Codice ISS)
Current Individuals

Istituto per la Sicurezza Sociale (Social Security Institute)

The Social Security Number is the personal TIN for individuals in San Marino.

Details
Examples
12345 123456789
Where to find it

On the front of the identity card, on the Carta Azzurra health card, and on tax-residence certificates issued by the Tax Office.

Common names
SSI Number Social Security Number Codice ISS
Structure
1-9 Sequential digits Numeric identifier assigned in sequence; leading zero digits may be omitted.
Official source
oecd.org iss.sm
Sammarinese Tax Registration Number (COE)
Current Individuals Entities

Ufficio Attività Economiche (Economic Activities Office) / Ufficio per il Lavoro (Labour Office)

The COE is the tax registration and economic-operator identifier used for legal entities and economic operators in San Marino.

Details
Examples
SM12345 SM00123
Where to find it

On the Certificate of License issued for the economic activity, and on tax-residence certificates issued by the Tax Office.

Common names
COE Codice Operatore Economico Tax Registration Number
Structure
1-2 Country prefix Fixed SM prefix.
3-7 Operator code Five-digit economic-operator code assigned in sequence.
Official source
oecd.org gov.sm pa.sm