Identify Payroll Risks Before the New Tax Year

March payroll is not just another monthly pay run

For mid-sized companies and larger organisations, it is the final full payroll cycle before the UK tax year closes — and often the moment when hidden weaknesses in payroll processes, data quality and system configuration become visible.

While tax year resets and statutory changes take effect in April, March is the point at which organisations discover whether their payroll is actually ready for them. For employers with 250+ employees or complex operating models, it is a critical control point: the last opportunity to validate data, challenge workarounds and address inconsistencies before errors flow into the new tax year.

When payroll governance is weak — over-reliance on individuals, undocumented processes, poor data discipline or system limitations — March is almost always when the cracks show. Handled well, it builds confidence and continuity. Handled poorly, it stores up risk that can persist for the rest of the year.

Why March payroll is uniquely high risk

March payroll carries the cumulative weight of the tax year while setting the data position for the transition into the new one. Payroll teams must ensure that records are complete, accurate and aligned ahead of April, when new tax codes, thresholds and rates take effect - often alongside pay awards, national minimum wage uplifts, benefit renewals and contract changes that also need to be reflected correctly at the start of the new tax year.

For employers with 250+ staff or larger payroll operations, this complexity is amplified by scale. Multiple payroll groups, legacy terms and conditions, acquisitions, TUPE transfers and varied benefit structures all place pressure on systems and people at exactly the same time. Payroll must ensure that values due to reset in April are correctly positioned, that others are accurately carried forward, and that rules are applied consistently across large employee populations — with very little margin for error.

March is also when year-end workarounds are exposed. Manual adjustments introduced during the year - to resolve issues or meet deadlines - rarely translate cleanly into the processes needed for the new tax year in April. Where payroll relies on undocumented processes or individual knowledge, March quickly and often visibly exposes those weaknesses.

From a risk and governance perspective, March payroll is not just another run — it is a stress test.

The most common post-year-end payroll errors

Post-year-end payroll errors are rarely dramatic system failures. More often, they are the result of small issues that compound at scale and surface together in March.

The most common areas of failure include:

• Incorrect carry-over data
  Values that should reset at the start of the tax year in April do not, while others that should carry forward are lost. This frequently affects student loan deductions, salary sacrifice arrangements, pensionable pay definitions and benefits in kind.
• Pay element sprawl and inconsistency
  Over time, larger organisations accumulate a complex range of allowances, supplements and pay codes. By March, inconsistencies emerge — duplicated pay elements, different tax treatments across payroll groups, or historical pay codes still in use long after their original purpose has ended.
• Manual adjustments becoming embedded
  Spreadsheets and off-system fixes used to “get year-end done” often become part of March payroll by default. At scale, this increases error risk, reduces transparency and makes payroll harder to assure.

Individually, these issues may appear manageable. Together, they undermine payroll confidence and control.

RTI accuracy and late correction risks

March payroll checks cannot be separated from RTI accuracy. The data position established in March directly affects the first Full Payment Submissions of the new tax year in April.

Under HM Revenue & Customs requirements, RTI submissions must be accurate, complete and on time. Errors left uncorrected in March can flow directly into employee tax records, student loan deductions and benefit entitlements, creating issues that persist throughout the year.

While corrections are possible, late amendments carry risk. They increase the likelihood of HMRC queries, generate employee complaints and create avoidable rework for payroll and HR teams. In larger organisations, even a small percentage of errors can affect hundreds of employees.

Effective March payroll control, therefore, includes:

• Validation of RTI data before submission
• Clear ownership and sign-off of RTI filings
• A controlled process for handling genuine corrections

(External guidance)

Starters, leavers and data hygiene failures

March payroll is particularly unforgiving when it comes to people data quality. Starters and leavers consistently represent one of the highest risk populations in large payroll environments.

Typical failures include incomplete onboarding data, incorrect start or leaving dates, missing tax information, and leavers remaining attached to benefits or payroll elements after exit. These issues often arise when HR, payroll, and systems are not fully aligned, or when processes differ across business units.

At scale, these failures create disproportionate impact:

• Overpayments and recovery issues
• Incorrect deductions and statutory reporting errors
• Employee dissatisfaction and loss of trust
• Significant management time spent fixing avoidable problems.

Strong March payroll checks explicitly test starter and leaver controls rather than assuming processes are operating as designed.

Payroll vs finance reconciliation gaps

One of the clearest indicators of payroll maturity is how March payroll reconciles with finance.

In weaker environments, March is characterised by unexplained variances, delayed journals and pressure to “make the numbers fit”. Reconciliations rely heavily on individual knowledge rather than documented controls, increasing key-person dependency.

In well-governed organisations, March payroll reconciliation is structured and predictable. Payroll outputs align with general ledger postings, variances are identified early, explained clearly and documented, and finance has confidence in the numbers being reported.

Strong reconciliation typically includes:

• Timely, documented payroll-to-GL reconciliations
• Clear explanations for variances
• Minimal post-period adjustments
• Shared accountability between payroll and finance

(External guidance)

What “good” March payroll looks like

In resilient organisations, March payroll is planned rather than endured.

There is a documented March payroll checklist agreed in advance, covering preparation for data resets, RTI validation, reconciliation and exception handling. Accountability is clear across payroll, HR and finance, with structured sign-off rather than informal approval.

Well-controlled environments typically demonstrate:

• Minimal reliance on manual adjustments
• Clear documentation of payroll processes and controls
• Issues logged, tracked and resolved at root-cause level
• Capacity to absorb change without firefighting

Most importantly, payroll accuracy is treated as a business risk issue. Leaders understand that payroll errors affect employee trust, regulatory exposure and organisational reputation — not just operational efficiency.

The action employers should take now

For many organisations, March payroll highlights risk but does not create the space to fix it. Payroll teams are focused on delivery, not diagnosis.

This is where engaging an independent third party adds real value.

An external payroll health check or payroll audit provides:

• An objective view of payroll risk and control
• Identification of systemic issues rather than symptoms
• Reduced reliance on key individuals
• Increased resilience during periods of change

For any employer, third-party payroll support is not a reflection of weakness. It is a governance decision that strengthens assurance, continuity, and confidence.

Practical support for year-end readiness

For organisations looking to strengthen confidence in their payroll processes, a structured payroll health check or audit can provide real insight. By reviewing controls, data quality, system configuration, and operational processes, independent expertise helps uncover hidden risks, reduce reliance on key individuals, and build resilience ahead of the new tax year.

March payroll provides a unique diagnostic moment — the organisations that act on it are the ones that reduce risk, improve confidence, and build lasting payroll resilience.

Additional support from Tugela People includes:

• Payroll health checks
• Independent payroll audits
• Managed payroll services
• Payroll systems and data optimisation
• Contingency and disaster recovery services

If you would like a confidential discussion about strengthening payroll control after year-end, Tugela People would be pleased to help. Our tailored services provide practical recommendations and actionable insight, giving teams the assurance that their payroll is accurate, compliant, and ready for the challenges ahead.

Links For External Statutory and regulatory guidance:

• HMRC – Running payroll and RTI reporting
• GOV.UK – Payroll record-keeping requirements
• The Pensions Regulator – Employer duties

March Payroll Checks: Your Questions Answered

• Why are March payroll checks more critical than other months?

  March is the final opportunity to validate payroll data and controls before tax year changes take effect in April.

• What payroll errors most commonly appear after year-end?

  Incorrect carry-over data, inconsistent pay elements, RTI inaccuracies, starter and leaver failures and reconciliation gaps.

• Is RTI compliance risk higher in March?

  Yes. Errors in the first RTI submissions of the tax year can have lasting consequences.

• Do larger employers or those with complex operating models face greater payroll risk?

  Yes. Scale and complexity increase both the likelihood and impact of payroll errors.

• What is a payroll health check?

  A structured review of payroll processes, data quality, controls and system configuration

• Should payroll audits be carried out annually?

  For large employers, an annual post-year-end payroll audit is widely regarded as best practice.

• Can payroll errors affect employee engagement?

  Absolutely. Payroll accuracy is one of the strongest drivers of employee trust.

• Are manual payroll workarounds acceptable?

  Occasional exceptions may be unavoidable, but routine reliance on manual fixes is a clear risk signal.

• Who should sign off March payroll?

  Best practice involves shared accountability between payroll leadership, HR and finance.

• What should happen when March payroll issues are identified?

  Issues should be documented, root causes identified, and controls strengthened — not simply corrected and forgotten.