VAT Returns and i.SAF Reporting: What Business Owners Need to Know

VAT returns and i.SAF reporting are connected, but they are not the same obligation. For a Lithuanian business, understanding the difference is essential: sending invoice data to VMI does not, by itself, complete the VAT return or pay the tax.

In practical terms, the VAT return reports the company’s VAT position, while i.SAF contains detailed VAT invoice registers. Businesses should manage them as separate submissions supported by the same accounting records. VMI explains the relationship through its preliminary VAT return service.

This guide focuses on business owners operating Lithuanian companies, including foreign-owned businesses. It explains the reporting calendar, the small-business scheme exception, the documents your accountant needs and the cross-border transactions that deserve extra attention.

If you have recently obtained a VAT number, our guide to what happens after Lithuanian VAT registration provides the broader next steps.

What is the difference between a VAT return and i.SAF?

FR0600 is Lithuania’s regular VAT return. i.SAF is the invoice-reporting subsystem within VMI’s i.MAS environment. One describes the VAT result for a tax period; the other provides the underlying invoice information.

The distinction matters most when planning deadlines. A company can have a quarterly VAT return while still needing monthly invoice-register submissions.

These are the ordinary deadlines; deregistration and liquidation have separate rules. Check the applicable calendar when a deadline falls on a non-working day. Sources: VMI’s i.SAF reporting rules, FR0600 submission guidance and VAT payment deadlines.

Who must submit i.SAF in Lithuania?

Taxable persons registered for VAT in Lithuania generally submit VAT invoice-register data. However, VMI explicitly excludes VAT payers applying the small-business scheme in Lithuania, known as SVS. A VAT number therefore does not automatically mean that ordinary i.SAF reporting applies.

For companies covered by the obligation, reporting is monthly. Individuals have different frequency rules linked to their VAT reporting period. Businesses that are not VAT registered generally do not submit i.SAF. See VMI’s current explanation of who reports.

Before setting up recurring filings, confirm the company’s actual registration status. If you are still deciding which registration is appropriate, BalticIncorp’s VAT registration service is a relevant starting point.

Can a Lithuanian company file VAT returns quarterly?

The default VAT period is a calendar month. A qualifying company whose economic-activity income did not exceed €300,000 in the preceding calendar year may request quarterly reporting. Newly established businesses may also request it based on expected income.

This is not automatic. Certain purchases of goods or services from other EU VAT payers require monthly reporting. A small company buying EU services should therefore check eligibility before relying on quarterly returns. VMI sets out these conditions in its VAT reporting-period guidance.

For planning purposes, keep the VAT return calendar separate from the invoice-register calendar. “Quarterly VAT” should never become an instruction to collect accounting documents only once every three months.

How VAT payable is calculated: a simple example

For a straightforward domestic business, the starting calculation is output VAT on sales minus deductible input VAT on purchases. The important word is “deductible”: a business expense and a recoverable VAT amount are not interchangeable concepts.

Consider a company that makes €10,000 of domestic sales before VAT and purchases €3,000 of supplies before VAT. Assume every transaction is subject to the standard 21% rate, all purchase VAT is deductible, and there are no other transactions or adjustments.

This is an illustrative calculation, not a template for every return. Lithuania’s standard rate is 21%, but qualifying transactions can receive different treatment. See VMI’s standard VAT rate guidance and our separate explanation of VAT rates in Lithuania.

Input VAT recovery depends on how the purchase is used and whether the statutory conditions are met. Purchases connected with activities that do not give a deduction right cannot simply be treated like ordinary taxable-business costs. SVS taxpayers are also excluded from ordinary input VAT deduction. VMI explains these distinctions in its guidance on input VAT recovery.

Which invoices belong in i.SAF?

The issued-invoice register records VAT invoices issued during the relevant period. The received-invoice register includes qualifying Lithuanian purchase invoices and foreign invoices that create an obligation to calculate Lithuanian VAT.

Credit and debit notes also require attention. Their treatment depends on whether the business is the seller or buyer and whether it issued or received the document. Do not delete an original sale from the accounting records merely because a customer later received a refund.

Equally, do not assume that every foreign receipt belongs in the same category. A reverse-charge service invoice and a foreign hotel invoice may have different reporting treatment. VMI’s invoice-register guidance explains the scope and exceptions.

For a business owner, the practical approach is to give the accountant the complete document set and identify unusual transactions. Let the reporting treatment follow the transaction, rather than deciding what to send based only on whether an invoice shows VAT.

How to prepare and submit the reports

Start with a monthly document cut-off agreed with your accountant. For example, an internal deadline early in the following month gives time to investigate missing invoices before statutory submissions are due. This is an organisational recommendation, not an additional legal deadline.

Provide sales invoices, purchase invoices, credit notes, bank statements and payment-provider reports. For cross-border transactions, include enough supporting information to explain what was supplied, who the customer was and where the goods or services belong for VAT purposes.

Invoice-register data can be entered directly into i.SAF, uploaded as an XML file or transmitted through supported integrations. The reporting obligation also covers periods with no invoices: where applicable, empty registers are submitted. See VMI’s submission instructions.

FR0600 is submitted electronically through EDS, VMI’s Electronic Declaration System. VMI’s filing guidance was updated on 14 January 2026. After submission, check the result rather than assuming a saved draft has been filed. See VMI’s FR0600 guidance.

If the different VMI services are unfamiliar, our guide to using the VMI portal provides additional orientation.

Why a preliminary VAT return still needs review

VMI can generate preliminary FR0600 and FR0564 data from i.SAF. This can reduce manual work, but it does not mean every transaction has been included correctly.

VMI’s guidance updated on 17 December 2025 identifies situations in which credit or debit notes and certain invoice lines are not automatically included. Missing correction references or particular classification details can affect the result. Review the draft against the accounting records before finalising it. See VMI’s preliminary-return guidance.

As a practical control, ask for a short reconciliation explaining the VAT payable, any excluded purchase VAT and any significant manual adjustments. A clear explanation is more useful to an owner than a screenshot showing that a file was uploaded.

Cross-border purchases: an invoice without VAT may still be reportable

Foreign software subscriptions, advertising and professional services deserve particular attention. Under the general business-to-business place-of-supply rule, qualifying services purchased from a foreign supplier can require the Lithuanian customer to calculate VAT under the reverse-charge mechanism.

VMI explains that, from 1 May 2025, the relevant purchases can also trigger registration as an ordinary VAT payer or a VAT payer applying SVS in Lithuania. The rule has conditions, including the supplier’s establishment and whether it applies the Lithuanian small-business exemption. See VMI’s guidance on services purchased from foreign suppliers.

The practical lesson is simple: “the supplier charged no VAT” is not enough to conclude that the transaction has no Lithuanian VAT consequences.

Selling to EU businesses: when FR0564 is relevant

FR0564 is a separate report covering specified supplies of goods and services to other EU member states. It is not a replacement for FR0600 or i.SAF.

It is generally filed for months containing reportable transactions, by the 25th of the following month through EDS. Certain qualifying EU services supplied by businesses applying SVS can also create an FR0564 obligation. Being exempt from i.SAF therefore does not mean being exempt from every cross-border report.

Not every foreign sale belongs in FR0564. VMI specifically explains that services supplied to non-EU businesses can appear in FR0600 without appearing in the EU sales report. See VMI’s FR0564 guidance.

What if i.SAF shows a mismatch?

i.SAF offers a cross-checking service that compares invoice data reported by transaction partners. An inconsistency is a reason to investigate, not a reason to immediately change otherwise correct accounting records.

VMI highlights issues such as incorrect invoice numbers and entering the receipt date instead of the invoice issue date. Start by comparing the original document with the submitted data, then ask the other party to check its entry where necessary. See VMI’s cross-checking guidance.

Keep a short record of what was checked and why a correction was or was not needed. If a mistake affects tax as well as invoice data, ask the accountant to assess both submissions rather than treating the i.SAF correction as the end of the process.

VAT payments and refunds need their own follow-up

Submitting a return and settling the liability are separate tasks. Decide who receives the payment instruction, who authorises the transfer and who checks that it has been allocated correctly.

Where deductible input VAT exceeds output VAT, the resulting difference is subject to the applicable offset or refund procedure. It should not be treated as an automatic, immediate bank repayment. VMI states that VAT overpayments and differences are offset or refunded under the Tax Administration Law’s procedures and time limits. See VMI’s VAT payment and refund guidance.

For cash-flow planning, request the expected VAT amount before the payment deadline. That gives the business time to reserve funds and resolve questions without making the final filing day a financial surprise.