The 2026/27 tax year started on 6 April. For SMEs running PAYE payroll and Making Tax Digital (MTD) for Income Tax, the first quarter of the year is when configuration oversights become compliance problems.

This article walks through the IT setup tasks that matter most for payroll and tax code management -- what to check, why it matters, and when to action it.

Why the New Tax Year Demands an IT Setup Review

Every April, HMRC publishes updated tax codes and national insurance thresholds. Your payroll software needs those updates before your first payroll run, or employees receive incorrect net pay from day one.

The problem compounds quickly. Incorrect deductions mean wrong take-home pay, which triggers employee queries, manual corrections, and potentially underpaid PAYE to HMRC. The administrative burden multiplies faster than most SMEs expect.

What to Check Before Your First Payroll of 2026/27

Confirm your payroll software has received the latest codes

Most cloud payroll systems -- Xero Payroll, Sage Payroll, and Zoho People Payroll -- push tax code updates automatically within days of HMRC's announcement. But automatic does not mean verified.

Check that your payroll system's tax code table reflects the 2026/27 codes. The standard personal allowance code is usually 1257L for most employees. HMRC publishes the full code table on GOV.UK shortly before each tax year begins.

Verify employee codes individually

Verify that each employee's code is applied in your system. Incorrect codes compound over the year, creating end-of-year reconciliation headaches. Cross-reference a few sample employee records against the HMRC code notice you receive for each staff member.

Check national insurance thresholds

National insurance thresholds change each tax year. Your payroll software should reflect the updated primary threshold, secondary threshold, and upper earnings limit automatically -- but you should verify this before processing payroll.

What Happens If I Miss the Tax Year Deadline?

Missing the tax year transition window can create compounding problems. The most common consequence is processing your first payroll under the old tax year's codes and thresholds. This means employees receive incorrect net pay from day one of the new tax year.

Correcting this retroactively requires issuing amended payslips and submitting corrected quarterly MTD figures to HMRC. The administrative burden multiplies quickly if you have more than a handful of employees.

Making Tax Digital: End-of-Year Setup Checklist

If you are enrolled in MTD for Income Tax, your setup should cover the following:

• Digital record-keeping -- ensure your accounting software maintains digital links between entries, incorrect profit reports, and failed HMRC submissions.

• Quarterly submission schedule -- confirm your software is set to submit quarterly updates for the correct tax year periods.

• End-of-year declaration -- verify your software can generate the final declaration form for 2026/27.

Backup before making changes

Before applying any major software updates or configuration changes during the tax year transition, export a recent data snapshot and store it securely. This simple step saves hours of recovery work if something goes wrong.

Common IT Setup Mistakes SMEs Make

The most frequent errors found during tax year transitions are:

• Processing the first payroll before updating tax codes -- this creates immediate compliance issues that require manual corrections.

• Assuming automatic updates are complete -- providers push updates, but you still need to verify they landed correctly across all systems simultaneously.

• Skipping the backup -- changes during tax year transition can introduce data corruption. Always back up before applying major changes.

How Infinite Cloud IT Can Help

We work with SMEs across Sussex and Kent to simplify tax year transitions. Our standard process covers:

• Full payroll system configuration review against HMRC requirements

• MTD software compatibility audit

• Cross-system data integrity verification

• Backup and disaster recovery review

A baseline review takes the guesswork out of it.

Book a Security Triage Call -- we will assess your current IT setup against HMRC compliance requirements and give you a clear action plan.

FAQ

When should I update my payroll software for the new tax year?

As soon as HMRC publishes the updated tax codes and national insurance thresholds for the new tax year -- ideally before your first payroll run. Most cloud payroll providers push updates automatically within days of HMRC's announcement, but you should verify the update has taken effect.

What happens if I process my first payroll with old tax codes?

Employees will receive incorrect take-home pay. You will need to issue amended payslips, correct your PAYE liability with HMRC, and submit amended quarterly MTD figures, adding administrative burden.

Do I need new software for Making Tax Digital?

Not necessarily. You need software that is MTD-compatible -- many cloud accounting and payroll platforms already are. The key is verifying that your current software is configured for the 2026/27 tax year and can generate the required quarterly submissions.

How often should I review my IT setup for tax compliance?

At minimum at the start of each tax year (6 April). We also recommend a mid-year check to catch any configuration drift caused by staff changes, software updates, or system migrations.