IT Security for Accounting Firms

Do You Know How Exposed Your Firm Really Is?

Most accounting firms believe they are secure until something proves otherwise. Get a clear, practical view of your Microsoft 365 risk.

For more than 21 years, Layer3 has delivered IT and cyber security services for organisations across professional services, corporate, NGO, and public sector environments.
We specialise in supporting accounting and legal firms where trust, confidentiality, governance, and operational resilience matter.

Get Your Free Security Snapshot

Plain-English report

See exactly where your Microsoft 365 environment is exposed.

Quick leadership clarity

Useful for partners and directors who want a clear view without the jargon.

Practical next steps

Know what matters most first, without overcomplicating the conversation.

Snapshot preview

Clear visibility before you act

Microsoft 365

0 Visibility score

Needs attention

Most accounting firms believe they are secure until something proves otherwise. Get a clear, practical view of your Microsoft 365 risk.

Privileged access is wider than expected

Too many high level admin accounts can increase the impact of a single compromise.

Protection is not consistent across staff

Some accounts may still be missing the controls you expect to see in place.

Unexpected sign-in activity stands out

Location, device, or application behaviour can reveal risk before an incident occurs.

Accounting Firms Are Prime Targets

You hold financial data, tax records, and client identities. That makes your firm highly attractive to modern attackers.

Plain-English report

Breaches often start with an account that looked normal until it was not.

Trusted email being misused

Once attackers get in, they can exploit the trust your firm has built with clients and suppliers.

Access that is too broad

Permissions that were convenient at the time can quietly become exposure later.

For many firms, the real risk is not just the incident itself. It is what happens next: clients lose confidence, your reputation takes a hit, and your firm’s name becomes associated with a breach.

For an accounting firm, trust is everything. Once that is damaged, it is hard to recover.

Why you're a target

Most firms have security tools in place. Antivirus, MFA, maybe a firewall. But in Microsoft 365, security is driven by configuration. Hundreds of controls sit under the hood, and how they are set determines your real level of protection.

Without visibility, it is easy to assume everything is fine when it is not.

Identity & sign-in controls

Hidden complexity

Admin privilege exposure

Needs review

Application permissions

Often overlooked

Conditional access coverage

Easy to overestimate

What we typically find

Why accounting firms work with Layer3

Trusted Security Expertise

ISO 27001-certified IT and cyber security built for professional services firms where trust, confidentiality, and operational resilience matter.

Modern Protection

Advanced cyber security designed for modern professional services firms, including 24/7 security operations centre monitoring, threat hunting and response, security intelligence, AI-powered email protection, identity protection, zero trust access, cloud security, and managed firewall protection.

Reputation Protection

Protect your firm’s reputation with AI-powered email protection, domain spoofing protection (DMARC), and visibility of security events across your environment.

Secure Use of AI

Enable the safe use of tools like Microsoft Copilot and ChatGPT by putting the right controls around data access, visibility, and usage.

Long-Term Partnership

Ongoing strategy, governance, risk assessment, and continual improvement to help your environment stay secure as your firm evolves.

See Your Risk Clearly

Layer3’s free Security Snapshot gives you a clear, plain English view of your Microsoft 365 environment so you can understand where your firm is exposed and what matters most.

Without a clear view of your environment, it is easy to miss the risks that matter most. This snapshot highlights key areas of exposure and brings attention to gaps that are often overlooked.

A clear security posture rating

Know where things broadly stand without needing to decode technical reporting.

Key risks explained in plain language

Understand the exposure, why it matters, and where attention should go first.

What is working and what is not

Get a balanced view rather than a long list of issues without context.

The most important areas to focus on first

Clear insight without unnecessary detail, so the next conversation is easier.

What Clarity Gives Your Business

The value of the snapshot is not just technical visibility. It gives leadership a more confident way to assess risk, prioritise action, and protect the trust your firm depends on.

Protect client confidence

Reduce the chance of security surprises turning into conversations about lost trust.

Prioritise the right investment

Focus budget and effort on the gaps that matter most rather than guessing where the risk sits.

Give partners a clearer picture

Turn a vague sense of risk into something easier to discuss, decide on, and act on.

Create a practical next step

Use the snapshot as a calm starting point for improvement rather than a hard sell.

What we typically find

Most Firms Are Surprised by What Shows Up

Too many high level admin accounts

Broader access than expected can turn a small issue into a larger one.

Staff without full protection in place

Controls are often present, but not always applied consistently.

Sign-ins from unexpected locations

Patterns in sign-in activity can reveal risk that would otherwise stay hidden.

Applications with more access than they need

Third-party integrations can quietly accumulate broader permissions over time.

How it works

Simple, Practical, and Obligation Free

We run the snapshot

We assess your Microsoft 365 environment to identify the key areas of exposure.

We walk you through it

We talk through the results with you via Teams or in person, in plain English.

You keep the report

You leave with a clear snapshot of your risk and a better sense of what to do next.

Beyond the snapshot

From Insight to Action

The Security Snapshot shows you where the risks are. What matters next is what you do about them. Layer3 works with accounting firms to put the right controls in place and ensure they stay effective over time.

Identity & Access

Protect staff accounts and control access to systems and data, whether in the office or remote, using modern zero trust access controls.

Threat Detection & Response

Detect and respond to suspicious activity across email, devices, and Microsoft 365 with automated response backed by a 24/7 security operations centre.

Security Strategy & Governance

Maintain and improve your security posture over time through ongoing strategy, risk assessment, and governance aligned to your firm.

Reputation Protection

Protect your firm’s reputation with AI-powered email security, domain protection, and visibility of security events across your environment.

Secure Use of AI

Enable the safe use of tools like Microsoft Copilot and ChatGPT by putting the right controls around data access, visibility, and usage.

Security is not a one-time setup. It requires ongoing attention, the right tools, and the right expertise.

A Clear View, With or Without a Follow-On Engagement

For many firms, the real risk is not just the incident itself. It is what happens next: clients lose confidence, your reputation takes a hit, and your firm’s name becomes associated with a breach.

Clearer decisions

Better visibility

Stronger trust

Practical next steps