CIOT / ATT & HMRC Agent Standards

Stop one weakness from exposing HMRC agent credentials, tax returns and client UTRs.

Tax Advisers depend on tax software, HMRC agent services and client portals. HackGuardX continuously scans your website, email domain, cloud and code for security vulnerabilities, so you can fix weaknesses before they become costly breaches. Enterprise-grade protection without the enterprise price tag.

Check My Business Security Book a Demo

Your business is a target. Hackers only need one weakness.

A single cyberattack on one of the UK's tax advisers could expose HMRC agent credentials, tax returns and client UTRs, halt day-to-day operations and trigger regulatory reporting, fines and lasting reputational damage. Small firms are not too small to be targeted. Automated attacks scan every UK business for an easy way in.

Why tax advisers are targeted: Stolen HMRC agent credentials let criminals file fraudulent repayment claims across an entire client base.

Peak risk window

31 January Self Assessment deadline

UK compliance context

Aligned with HMRC Standard for Agents, CIOT/ATT professional rules and UK GDPR, NCSC Cyber Essentials technical controls and UK GDPR Article 32 security obligations.

The top cyber risks for Tax Advisers

Critical

HMRC Agent Credential Theft

Phishing pages imitating HMRC Government Gateway used to steal agent logins.

Critical

Microsoft 365 & Google Workspace Account Takeover

A single phished password without MFA gives attackers your email, files and calendar, and lets them impersonate you to clients and suppliers.

Critical

Email Domain Spoofing & Impersonation

Without strict SPF, DKIM and DMARC, anyone can send email that looks like it came from your tax adviser domain, to your own customers.

Find your weaknesses before hackers do

HackGuardX continuously scans the digital infrastructure tax advisers rely on, helping you identify and fix threats before they become costly breaches.

Microsoft 365 & Workspace Auditing

Checks MFA coverage, legacy authentication, risky sharing links and admin roles across every user, in plain English.

SPF, DKIM & DMARC Protection

Continuously validates your email authentication so criminals cannot impersonate your domain.

Plain-English Fix Guides for Tax Advisers

Every finding comes with a prioritised, step-by-step fix you can action yourself or forward to your IT provider in one click.

Run a free security check for your tax adviser domain

Passive and non-intrusive. Enter your domain and we'll email you the report.

Safe Passive DNS, TLS & Header Inspection

Non-intrusive public check • Active scanning requires verified ownership

Or test an instant demonstration profile:

Tax Advisers: cybersecurity FAQs

Why would hackers target tax advisers?+

Stolen HMRC agent credentials let criminals file fraudulent repayment claims across an entire client base.

What is the biggest cyber risk for tax advisers?+

HMRC Agent Credential Theft. Phishing pages imitating HMRC Government Gateway used to steal agent logins.

Does HackGuardX help tax advisers with compliance?+

Yes. Aligned with HMRC Standard for Agents, CIOT/ATT professional rules and UK GDPR, NCSC Cyber Essentials technical controls and UK GDPR Article 32 security obligations. Every scan produces timestamped evidence you can share with insurers, regulators and clients.

How quickly can tax advisers get started?+

Run a free passive exposure check in under a minute with just your domain. Full continuous monitoring on the Starter plan connects in around 10 minutes, with no hardware or agents to install.