The 2025–26 tax year ends on 6 April. If your business has been preparing for Making Tax Digital, end-of-year compliance, or broader IT upgrades, you will have spent the weeks before that date getting things in order.

What happens next is just as important. The weeks following tax year end are when many SMEs discover that what looked fine on paper does not hold up under scrutiny — or worse, that they have missed the window to fix something before the next compliance cycle begins.

This is not a retrospective checklist. It is a forward-looking plan for what to schedule and diarise in the weeks after 6 April, so you do not lose momentum or leave gaps unaddressed.

What should UK SMEs check after the tax year ends?

You do not need to wait for your accountant to finish filing before starting this process. Many of the items below are independent of whether your tax returns have been submitted.

What to review in the first two weeks after 6 April

You do not need to wait for your accountant to finish filing before starting this process. Many of the items below are independent of whether your tax returns have been submitted.

Confirm what actually changed during the tax year

If you upgraded software, replaced hardware, or migrated data between systems during the run-up to April, verify that those changes are documented and working as expected. This is not about second-guessing decisions — it is about confirming that the systems you rely on continue to function after the pressure of year-end.

A practical way to do this is to walk through your core business processes — invoicing, payroll, data backup, remote access — and confirm each one works on the current setup. If something does not, you have a full quarter to fix it before the next compliance deadline.

Test your backups against real data

This is one of the most common gaps in SME environments. Many businesses back up their data but have not tested a restore since the last major change. After any significant IT work — whether it is a software upgrade, a device replacement, or a migration to cloud storage — you should verify that your backups contain the data you need and that the restore process works.

Backup and business continuity is not an optional add-on. It is a baseline requirement for any business that cannot afford to lose its data. If you have not tested a full restore in the last six months, schedule one now.

Review your Cyber Essentials posture

Cyber Essentials is not just a certificate to display on your website. It represents a minimum standard of security controls — identity management, device configuration, patching, malware protection, and secure network setup. Many SMEs let their posture drift after a certification review and only notice the gap when a client asks for evidence or an audit flags a compliance issue.

The Cyber Essentials framework gives you a clear baseline. If you are certified, review your controls against the current standard. If you are not, this is a good time to start that conversation before your next contract or tender requires it.

Why timing matters for post-year reviews

There is a practical reason to start this review now rather than waiting until July or August. The weeks after 6 April are often quieter for SMEs — the intense pressure of year-end compliance has passed, and teams have a bit more headroom to focus on longer-term issues.

If you leave this until later, you risk:

• Missing the window to plan IT changes before the autumn procurement cycle

• Discovering compliance gaps only when a client or regulator asks for evidence

• Letting technical debt accumulate across the summer when your team is stretched

Starting in April gives you three months — until the end of June — to plan, budget, and implement any changes before the next financial quarter begins.

Building a standardised baseline for the rest of the year

One of the most common problems SMEs face is that their IT environment grows organically over time. Different devices, inconsistent software versions, ad-hoc access permissions — none of this is inherently wrong, but it makes it difficult to prove that your systems meet basic security and compliance standards when it matters.

Standardisation in SME IT is not about adding complexity. It is about creating a clear baseline that you can measure against, audit, and maintain. If you have been reviewing your systems after the tax year end, this is the natural next step: take what you have learned from your post-year review and use it to define what your standard should look like going forward.

What managed IT support should include at this stage

If you are still evaluating whether your current IT support arrangement is sufficient, the post-tax year review period is a good time to assess it. A serious managed IT support provider should give you — not as an upsell, but as standard — a defensible baseline that covers device standards, identity control, backup integrity, and operational visibility.

The managed IT support model for Sussex SMEs should not leave you guessing about what is covered and what is not. If your current arrangement does not include regular backup testing, documented device standards, or a clear Cyber Essentials pathway, that is something to address now — while you have time.

Frequently asked questions

Should I wait for my accountant's submission before reviewing my IT systems?

No. Most of the items in a post-tax year IT review — backup testing, Cyber Essentials posture, device standards — are independent of your tax filing status. Starting now gives you more time to act.

How long should a post-tax year IT review take?

For a typical SME, a focused review of the core areas listed above can be completed in a few days. If you need to plan wider changes — software migrations, hardware replacements, or compliance certifications — those projects will take longer, but the review itself is a quick sense-check.

Is Cyber Essentials required for all SMEs?

It is not a legal requirement, but it is increasingly expected by clients, especially those in government supply chains. Many larger organisations now require their SME suppliers to hold at least a Cyber Essentials certificate. If your business works with government contracts or large enterprise clients, you should treat it as a baseline requirement.

What is the best time to plan IT changes after the tax year?

The weeks immediately following 6 April are ideal. Your team has some breathing room after year-end, and you have the full second quarter to plan, budget, and implement changes before the next compliance cycle.

How do I know if my IT support provider is doing enough?

Look for three things: documented device standards across your organisation, regular backup restore testing, and a clear pathway to Cyber Essentials compliance. If your provider cannot show you these things, it is worth having a conversation about what they actually cover.

What to do next

A post-tax year IT review does not need to be a major project. It is a structured sense-check — confirm what changed, verify that your backups work, assess your security posture, and decide whether your current IT support arrangement is giving you the baseline you need.

If you want a focused view of where your systems stand, a Security Triage Baseline Review covers the key areas above without committing to a full project. It is a practical starting point if you want clarity on your current position before planning changes for the rest of the year.

For businesses that need to understand how their backup and recovery fit into a broader compliance strategy, our backup and business continuity page walks through the common failure modes in SME environments and what to do about them.