---
title: "Firm details attestation for principals and their ARs · Merrin"
description: "Each year a principal confirms its own and its ARs' details on the FCA Register within 60 business days of its accounting reference date."
url: https://merrin.ai/glossary/firm-details-attestation
---

[Glossary](https://merrin.ai/glossary)

# Firm details attestation

Firm details attestation is the yearly task in which a firm checks the details the FCA holds on it and corrects or confirms them. For a principal it also covers its ARs and IARs as they appear on the Financial Services Register. It is due within 60 business days of the firm's accounting reference date.

## The rules

- Check the firm's details between the accounting reference date and 60 business days after it, and correct anything wrong (SUP 16.10.4R).
- For ARs, use the SUP 12 forms to correct the Register: add an AR that is missing, change wrong details, or terminate one still shown.
- AR details came into scope through PS22/11, first for accounting reference dates on or after 1 December 2023.
- A late or missing attestation can lead to an administrative fee and a non-compliant banner on the Register.

## Common misconceptions

**“Attestation is where you report AR changes.”**

Changes must be notified as they happen (SUP 12.7.7R). The attestation is a yearly check on top.

## In Merrin

The attestation sits on the principal's own calendar in Merrin, keyed off its accounting reference date alongside REP025.

[Returns & tasks](https://merrin.ai/features/returns)

## Related terms

- [REP025](https://merrin.ai/glossary/rep025)
- [Notifying the FCA about ARs](https://merrin.ai/glossary/ar-notifications)
- [PS22/11](https://merrin.ai/glossary/ps22-11)

## Sources

Checked against these sources on 23 October 2026. This is general information, not legal advice.

- [FCA Handbook, SUP 16.10](https://www.handbook.fca.org.uk/handbook/SUP/16/10.html)
- [FCA: Firm information](https://www.fca.org.uk/firms/firm-information)
- [PS22/11: Improving the Appointed Representatives regime](https://www.fca.org.uk/publications/policy-statements/ps22-11-improving-appointed-representatives-regime)

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