01/ 07
Data security
- Encryption in transit (TLS) and at rest across the platform.
- Role-based, least-privilege access with multi-factor authentication.
- Continuous monitoring, logging and regular security testing.
Security & compliance
Your standards, upheld.
Security and professional integrity aren't features — they're the foundation. Here's how A4 keeps your information safe and your engagements sound.
Every entry explained. Every figure evidenced. Every return filed, on time.
02/ 07
Confidentiality
- Client information is treated as strictly confidential at all times.
- Access is limited to the team members working on your engagement.
- Professional confidentiality obligations bind everyone at A4.
03/ 07
Compliance & professional standards
- Work delivered in line with applicable accounting, audit and tax standards.
- GDPR-aligned data handling for all personal data we process.
- Engagements governed by clear terms and professional ethics.
04/ 07
Audit & quality controls
- Layered review — preparer, reviewer and partner sign-off.
- Standardised working papers and documented methodology.
- Quality controls applied consistently across every engagement.
05/ 07
Technology & compliance
- Hosted on reputable, GDPR-compliant EU infrastructure.
- Regular encrypted backups and tested recovery procedures.
- Vendor and sub-processor due diligence on the tools we use.
06/ 07
Client responsibility
- Keep your portal credentials private and enable MFA.
- Share information through the portal rather than insecure channels.
- Let us know promptly of any changes to authorised users.
07/ 07
Ongoing improvements
- Security and controls are reviewed and updated continuously.
- We track regulatory change and adapt our processes.
- Feedback and incidents feed directly into improvement.
