What Is SAF-T? Standard Audit Files for Tax and Digital Tax Auditing Explained

A complete guide to the Standard Audit File for Tax: what it is, who created it, what it contains, and which countries require it.

Last reviewed: June 2026

What is SAF-T?

SAF-T, short for Standard Audit File for Tax, is a standardised electronic format used to exchange tax-related accounting data between businesses and tax authorities. Rather than supplying records in inconsistent, system-specific layouts, an organisation produces a single structured file that any compliant tax administration can read in the same way. The goal is to simplify the auditing process, strengthen tax compliance, and improve transparency across the tax system.

A SAF-T file presents financial information in a unified structure, drawing together transactional records such as invoices and receipts with data from accounts, general ledger entries, and tax reporting. Because the format is consistent, it enables more efficient audits and supports the broader effectiveness of tax administration. In practice, SAF-T is one of the clearest examples of how tax authorities are moving from manual, paper-based reviews toward fully digital tax auditing.

Who created SAF-T, and when?

SAF-T was created by the Organisation for Economic Co-operation and Development (OECD). The OECD published the first version of the schema, version 1.0, in May 2005, defining what a SAF-T file should contain and how the data should be formatted and structured. The original schema centred on the general ledger, invoice and payment details, and customer and supplier master files.

A revised version 2.0 followed in April 2010, extending the schema to cover inventory and fixed assets so it could handle more complex financial reporting. Version 2.0 is not fully backward-compatible with version 1.0, which is one reason national implementations differ: some countries adopted the earlier version while others built on the later one. The OECD defines the standard itself, but each tax administration decides the exact data it captures and how and when files must be submitted.

What does a SAF-T file contain?

A typical SAF-T file brings together the core financial and tax information a tax authority needs to verify compliance. While the precise contents vary by country and schema version, most files include the following:

• Taxpayer information – the identification number and core business details of the organisation.
• General ledger accounts – details of the accounts maintained and the entries posted to them.
• Invoices and credit notes – transactional data including VAT information and payment details.
• Customer and supplier information – master data on the business partners involved in transactions.
• Tax details – applicable tax categories, rates, and amounts.

From version 2.0 onward, the schema also accommodates inventory and fixed-asset records, and some national variants extend further into areas such as accounts receivable and payable or payroll data.

What format is a SAF-T file?

SAF-T files are structured in XML (Extensible Markup Language). XML allows standardised data representation and integrates readily with accounting and enterprise resource planning (ERP) systems. Its flexibility is part of why the standard has spread so widely: the same underlying approach can be adapted to the differing requirements of individual jurisdictions and businesses without abandoning a common, machine-readable foundation.

Which countries require SAF-T?

Although SAF-T provides a common international starting point, individual countries tailor it to their own regulatory frameworks, so requirements and submission rules differ. Adoption has been concentrated in Europe, with Portugal acting as the early pioneer. The table below summarises how some of the main adopters apply the standard.

By contrast, the United Kingdom did not adopt SAF-T, choosing its Making Tax Digital (MTD) initiative and a focus on digital VAT submissions instead.

How is SAF-T submitted?

Across the countries that have adopted SAF-T, three broad submission models have emerged. In the first, data is provided only at the request of the tax authority, typically ahead of an inspection or audit. In the second, files are submitted periodically alongside the regular VAT return. In the third, a single combined filing merges the VAT return with transaction-level detail, as Poland does with its JPK_V7 file. The model in force determines how often a business must generate compliant files and how deeply SAF-T is embedded in its day-to-day reporting.

What are the benefits of SAF-T?

For tax authorities, SAF-T enables faster, more consistent audits because data arrives in a predictable, machine-readable structure rather than dozens of bespoke formats. For businesses, the standardisation streamlines the way accounting data is fetched and organised, improves the quality and accessibility of archived records, and simplifies compliance for multinational groups operating across several jurisdictions. The shared objectives of the standard – facilitating compliance, reducing the cost and complexity of audits, improving data accuracy, and providing a clear and consistent format – benefit both sides of the relationship.

What are the challenges of implementing SAF-T?

Adopting SAF-T is rarely without difficulty. The most immediate challenge is cost: meeting the standard often calls for significant upfront investment in accounting software, staff training, and process changes, and organisations must confirm that their systems can genuinely produce compliant files.

Data quality is a second, ongoing concern. Reliable SAF-T outputs depend on accurate, well-organised accounting records, and shortcomings can create complications during an audit that may lead to penalties or wider compliance issues. Because countries periodically revise their regulations and schemas, organisations must also monitor change closely, treating compliance as a continuing obligation rather than a one-off project.

Integration is the third challenge. Embedding SAF-T functionality within existing ERP or accounting systems can be technically demanding, particularly for organisations that rely on legacy infrastructure, and specialist expertise is often required to deliver a smooth and dependable transition.

SAF-T and the future of digital tax auditing

Standard Audit Files for Tax represent a significant step forward in how tax data is collected, exchanged, and audited. By advancing standardisation and transparency, the framework improves the relationship between businesses and tax authorities, strengthens compliance, and reduces the costs traditionally associated with audits. The implementation hurdles are real, but they are generally outweighed by the longer-term benefits of a more efficient and effective approach to tax administration. As tax authorities worldwide continue to embrace digital transformation, SAF-T is poised to become a foundational component of the global tax landscape.

Key takeaways

• Definition: SAF-T is a standardised, XML-based file for sending accounting and tax data to tax authorities.
• Origin: Created by the OECD, with version 1.0 in 2005 and version 2.0 in 2010.
• Adoption: Mainly European; Portugal led in 2008, followed by Poland, Norway, Romania, and others.
• Purpose: Faster, more accurate digital audits and lower compliance costs.
• Challenges: Upfront cost, data quality, and integration with existing or legacy systems.