Most SMEs think about tax year-end in terms of accounts, software and deadlines. Few think about what their IT systems need to be doing by 6 April.

That is a gap. Not because it will trigger a fine — but because when an accountant, insurer or a prospective client asks for proof of how your data is managed, the answer matters. If you are working through your systems for the first time after April arrives, you are already behind.

This article covers the IT-specific tasks that UK SMEs — particularly owner-managed businesses with roughly 10 to 25 people — should verify before the tax year changes. It is about practical checks, not theoretical frameworks.

Why do IT year-end tasks matter for SMEs?

The tax year change does not create IT risks. It creates a deadline. Any business that relies on documentation, evidence or compliance — whether for an audit, an insurance renewal, a tender process or Cyber Essentials recertification — needs those records in place before April.

The practical reason February matters is timing. A backup gap you notice in February can be investigated. The same gap noticed in May — during a tender response — is a problem you cannot fix fast enough.

What IT year-end tasks should SMEs prioritise?

1. Verify backup coverage and test restores

Backups are not one of the five official Cyber Essentials controls. They are, however, one of the first things any insurer or prospective client will ask about, and they are the difference between a recoverable incident and a fatal one.

Most SMEs have a backup tool installed. Far fewer test restores. A backup that exists but has never been verified gives a false sense of security — and that security evaporates the moment you need it.

Before the tax year changes, verify:

• What data is actually being backed up? (Microsoft 365 mailbox data, SharePoint, OneDrive, local files — or just a subset?)

• When did the last backup run complete successfully?

• When was the last time a restore was tested, and what was the result?

• Are backup failures or gaps tracked to resolution?

Microsoft 365 retention features and recycle-bin tools are platform-level safeguards, not a substitute for an independent backup copy. If your backup data lives inside the same Microsoft 365 tenant, it is reachable by the same credentials and the same threat actor. An independent backup — held outside the tenant — is what makes recovery genuinely resilient.

The NCSC's small-business checklist includes backup and recovery as a fundamental area. The practical question for any SME is whether that backup can actually be used when needed.

2. Review user access and leaver management

The most common reason SMEs struggle with evidence production is not a broken system. It is a messy access list.

Before April, confirm:

• Every leaver from the past six months has had their Microsoft 365 and shared system accounts disabled

• No former employee retains access to email, file shares, cloud storage or admin consoles

• Shared or service accounts are identified and reviewed — they are not permanent workarounds

• Multi-factor authentication (MFA) is active for every account with access to business data

The National Cyber Security Centre includes stronger sign-in protection — MFA, access reviews, removal of stale accounts — as fundamental controls for small businesses. These are not optional extras. They are part of what any reasonable auditor will expect to see.

If you cannot produce a clean list of active accounts within a few minutes, you already know that access control needs attention.

3. Check patch compliance and unsupported devices

Outdated systems are not a tax year problem. But the end of a financial period is a natural point to verify that devices are being kept current.

Before April, confirm:

• All machines running on your business network are receiving security updates

• End-of-life operating systems (such as Windows 10, which reached end of support in October 2025) are either upgraded or replaced

• Any unsupported devices are segmented from the main network

The NCSC's Cyber Essentials technical controls include secure configuration and security update management as two of the five baseline requirements. These are not marketing terms — they are what assessors check. If your patching process relies on memory rather than automated tools, you already know what will happen when an auditor asks for evidence.

4. Prepare documentation for auditors

Accountants do not need perfect IT. They need evidence that you understand what you run and can produce it when asked. A basic year-end evidence pack usually includes:

• A current device and asset inventory (who owns what, where it sits, which OS it runs)

• A list of active user accounts with their roles, especially admin access

• Patch and update status showing that systems are kept current

• Evidence that backups exist and have been tested

This is not a Cyber Essentials assessment. It is a practical check that you can answer three questions clearly: what do we run, who has access to it, and can we recover from failure?

If you rely on memory or tribal knowledge rather than documented records, your accountants will notice. That does not mean you are doing badly. It means you have not made it easy for yourself.

How much time should SMEs spend on year-end IT checks?

For a 10-to-25-seat business, a structured review of these four areas typically takes between two and four hours spread across a week. It is not a massive time investment. The cost of doing it poorly — lost data, compliance gaps, failed tender checks — tends to be much higher.

The NCSC reports that cyber attacks on UK businesses are frequent and persistent. The UK Cyber Security Breaches Survey 2025 found that 43% of businesses identified a cyber breach or attack in the last 12 months. Regular, structured reviews are the practical defence against that exposure.

What happens after April arrives?

The new tax year does not reset your IT problems. It simply starts a fresh financial period, and any gaps in backup coverage, access control or patching remain open. The key advantage of February is that you have time to address them before other deadline-driven pressures arrive.

Once April passes, your focus shifts to the new system year: Making Tax Digital compliance for income tax, updated reporting requirements, and any changes to how you store and transmit financial data. That work builds on a solid IT baseline — which is exactly what these February checks help you establish.

FAQs

Are these year-end IT tasks only necessary for Cyber Essentials compliance?

No. While Cyber Essentials is one reason SMEs review their systems, the same checks support insurance renewals, tender responses, accountant audits and general operational resilience. The effort is the same regardless of which trigger you are working toward.

Can we complete these checks in-house without an IT provider?

Yes — provided someone in the business has the time and knowledge to perform them. The issue for most owner-managed SMEs is that the person who understands the systems is also the person keeping the business running. That is why many businesses use a Security Triage Call to identify what needs attention before committing to a longer programme.

How often should we repeat these checks beyond the year-end?

At minimum annually, though quarterly reviews are a better cadence for backup testing and access reviews. The NCSC recommends that small businesses maintain ongoing awareness of their security posture, not just at a fixed point in the financial year.

Do these IT checks apply to businesses using fully outsourced IT support?

Yes. Even if you use an external IT provider, you are still responsible for verifying that backup coverage is complete, that leavers are removed from systems, and that patches are being applied. You should ask your provider for evidence rather than taking their word for it.

What is the cheapest thing we can do if we are short on time?

Start with user access. Disable leavers and review admin accounts. That single check takes an hour and addresses one of the most common security gaps. Everything else is worth doing — but access control is the lowest-hanging fruit.

What should you do next?

You do not need a perfect system. You need a system you can verify, and a plan to keep it verified.

If you are not sure where your systems stand right now, book a Security Triage Call to identify what matters before April arrives.