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MMR-SASK is a mandatory daily report that financial institutions in Lithuania must submit to VMI (State Tax Inspectorate). It captures information about opened and closed accounts, account representatives, and beneficial owners.

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What you report

  • Accounts - Bank accounts including current, deposit, loan, savings, payment card, securities, and crypto asset accounts
    1. The iban and currency fields are immutable and cannot be changed after reporting. Contact support if you submitted an incorrect value.
  • Representatives - Individuals authorized to manage accounts on behalf of account holders
    1. Representatives can be included in the initial account creation request (POST /reports/sask/v1/accounts). After that, all representative changes must go through the dedicated endpoints (POST and PUT /reports/sask/v1/accounts/{accountRefId}/representatives).
    2. Updating an account (PUT /reports/sask/v1/accounts) only affects account-level data and does not overwrite representatives.
  • Beneficiaries - Ultimate beneficial owners of legal entities holding accounts
    1. Report beneficiaries only once per legal entity — when the first account is opened. Subsequent accounts for the same entity do not require a new beneficiary report.
    2. Beneficiaries are not linked to accounts directly. They are reported separately using the legal entity’s codeInForeignCountry (identification code), which is the shared identifier between account’s owner and beneficiaries.
    3. When a person is no longer a beneficiary, submit an update with the dateTo field set to the date the relationship ended.
    4. When a company closes its last account, submit an update with the dateTo field to end the beneficiary relationship.
    5. Only report beneficiaries of companies registered outside Lithuania. VMI already has data on Lithuanian companies.

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Simplified identity verification (SIV)

If your institution applies simplified customer identity verification to a person, set the siv field to true on the person object (account owner, representative, or beneficiary). The flag maps to the VMI attribute STN. For non-Lithuanian natural persons (type = F without a Lithuanian person code), siv: true changes which fields are required:
  • documentType, documentNumber, and codeCountry become optional.
  • Instead, provide birthDate together with a complete address (addressCountry and address), or birthDate together with at least one nationality.
If siv is false or omitted, the standard rules apply: non-Lithuanian natural persons must provide birthDate, documentType, documentNumber, and codeCountry.

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Unique reference IDs

Unique reference IDs are generated for submitted records and used to link related data, such as accounts and representatives. When submitting corrections or updates, the relevant reference ID must be used to ensure the change is applied to the correct record.

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API Reference

Explore the full API specification in the Swagger documentation.
IP Whitelisting Required: Before you can access the Swagger documentation, your IP address must be whitelisted. Contact us to register your IP addresses.

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Resources

Accounts

Create and update account records with owner information

Representatives

Manage account representatives

Beneficiaries

Report beneficial owners of legal entities
Last modified on August 5, 2026