How to correct payroll errors in the UK

Quick answer

This is a specialist extension to Lesson 11: Handle payroll changes, leavers and corrections. Use Lesson 11 for the complete change-versus-correction framework; use this guide when investigating the evidence and root cause of a specific payroll error.

When payroll is wrong, preserve the original evidence, identify the affected employee and pay periods, determine whether the error changes gross pay, deductions, net pay, employer liabilities or RTI, recalculate using the correct tax-year rules, make the appropriate payroll and HMRC correction, explain the impact to the employee, reconcile payments and document the cause.

Do not “fix” an error by deleting the completed run, overwriting year-to-date values or forcing a balancing number into the next payslip without understanding its treatment. The correction needs to leave payroll, employee payment, HMRC reporting, pensions and accounting records consistent.

Stop and preserve the evidence

Save the original payroll report, payslip, employee instruction, FPS response, payment evidence and any message that exposed the problem. Record when the error was discovered and who is investigating. Restrict further changes until the affected period and employee are clear.

Preserving evidence does not mean leaving the employee without help. If the error creates hardship or a legal payment problem, escalate quickly and agree an authorised interim action. Keep that payment separate from the technical correction so both can be explained.

Classify the error before choosing a correction

Ask five questions:

1. Was the employee paid too much, too little or the correct net amount?
2. Was gross pay or only a deduction wrong?
3. Was incorrect information sent to HMRC?
4. Does the issue affect pensions, statutory pay, loans or another body?
5. Is it in the current tax year or an earlier tax year?

Common causes include missing hours, duplicated bonuses, wrong salary effective dates, incorrect tax codes or National Insurance categories, omitted starters or leavers, changed payroll IDs, pension setup mistakes and bank-payment failures. Similar symptoms can require different fixes.

Recalculate from the correct inputs

Recreate what payroll should have been using the rules and year-to-date position for the affected period. Do not calculate tax or National Insurance from a simple percentage unless that is genuinely the required method. Payroll calculations can be cumulative and thresholds vary by period and tax year.

Compare original and corrected values for gross pay, taxable pay, PAYE, employee and employer National Insurance, pension, loans, statutory items, other deductions and net pay. The difference schedule becomes the basis for employee communication, payment, recovery, RTI and reconciliation.

If the error spans several periods or previous years, stop before making a bulk adjustment. Use HMRC’s current previous-year guidance and obtain support if values are material or the software cannot produce the required correction reliably. The Academy’s NI category H guide shows why current and previous years should be separated.

Correct underpayments

Where an employee was underpaid, confirm the corrected gross and net amount and arrange payment promptly through an authorised route. Decide whether an additional payroll run, next regular payroll or other process is appropriate based on timing, employment terms and reporting guidance.

Give the employee a clear corrected statement or payslip. Explain the gross correction, deductions and payment timing. Do not describe the difference only as “net adjustment”; the employee should be able to see how it was calculated.

Check whether the underpayment created a National Minimum Wage, statutory-pay or contractual issue requiring faster escalation. A routine next-month correction may not be appropriate in every case.

Handle overpayments carefully

An overpayment is not solved simply by deducting the gross amount from the next net payment. Confirm the legal and contractual position, communicate with the employee and agree a reasonable recovery process where appropriate. Tax, National Insurance and pension treatment must follow the corrected payroll values.

Separate a genuine payroll overpayment from a duplicate bank transfer. A duplicated bank payment with correct payroll and FPS may require a banking and recovery process rather than another gross-pay correction. Document the distinction.

Correct RTI using current guidance

HMRC’s correction process depends on the tax year and nature of the error. Current-year corrections are commonly reflected through the next FPS or the software’s supported correction workflow. Previous-year errors may require a different process. Follow current GOV.UK guidance and the software provider’s documented steps.

Use the same employee identity and payroll ID unless HMRC guidance specifically requires otherwise. Check submission acceptance and compare the updated HMRC account with the corrected liability. If the employer has paid too much or too little, record how the difference will be offset or paid.

Reconcile every connected record

After correction, reconcile:

• corrected employee gross and net pay;
• actual bank payments or recoveries;
• FPS or other RTI reporting;
• HMRC liability and payments;
• pension contribution schedules;
• accounting entries and payroll journals;
• payslips and employee communication;
• year-to-date balances.

An error remains open until these records agree or a documented timing difference explains why they do not.

Prevent recurrence

Finish with a short root-cause review. Decide whether the cause was missing information, duplicate entry, unclear ownership, software setup, inadequate review, access control or training. Give the preventive action an owner and deadline.

Useful controls include unique input files, period locks, change reports, two-person review for bank and salary changes, variance thresholds, stable payroll IDs and a checklist that separates calculation, submission, payment and reconciliation.

Return to the Academy

Return to Lesson 11 to coordinate the payroll, employee-payment, FPS, EPS, pension and communication outcomes. Then continue to Lesson 12 to apply the same discipline at the tax-year boundary.