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Consistent and standards-based comma-separated values (CSV) files help make data more effective and easier to share across government.

• Updated: 12 March 2021

This Privacy Notice explains who is processing your data, the personal data we collect, how we use it, who we share it with, and what your legal rights are.

• Updated: 3 April 2024

• Updated: 22 April 2021

Find out how to complete and submit a return using the HMRC spreadsheet or electronic flat text file (EFTF).

• Updated: 27 February 2025

Find out how to send annual returns if you're an ISA manager.

• Updated: 22 April 2021

Information about how to upload data to the National Fraud Initiative (NFI) and how to format the data correctly to avoid issues.

• Updated: 19 July 2024

How to complete and submit an Other Interest (OI) return using the HMRC spreadsheet or electronic flat text file.

• Updated: 27 August 2024

Learn how to publish accessible documents to meet the needs of all users under the accessibility regulations.

• Updated: 14 August 2024

A platform for the online transfer of information and documentation.

• Updated: 3 November 2022

This guidance is an introduction to the Open Document Format (ODF) standard and how you can select ODF-compliant solutions.

• Updated: 18 December 2018