A payroll error is rarely just a small admin issue. For a small employer, one incorrect payslip or a missed submission can quickly become an unhappy employee, a difficult cash flow conversation or an avoidable query from HMRC. The top payroll mistakes employers make are usually not caused by carelessness. They happen because payroll rules, deadlines and employee changes are easy to lose track of when you are busy running the business.
The good news is that most problems can be prevented with a clear process, accurate records and a little support when things become complicated. Here are the errors we see most often, and the practical steps that help keep payroll calm, accurate and on time.
Top payroll mistakes employers should watch for
Missing the payroll submission deadline
For most employers, a Full Payment Submission (FPS) must be sent to HMRC on or before employees are paid. It is easy to focus on getting money into bank accounts and assume the reporting can wait until later, especially during a busy week. However, late submissions can lead to penalties and create unnecessary work putting records right.
Set a firm payroll timetable that includes time to check hours, overtime, holiday, sickness and any changes to pay. Do not leave the process until payday morning. If payday falls around a bank holiday, allow extra time for payments to clear and for any questions to be resolved.
There are occasional circumstances where a late submission may have a reasonable excuse, but it is far better not to rely on that. A consistent monthly or weekly routine is simpler for everyone.
Paying staff from incomplete information
Payroll only works when the information going into it is right. A manager may approve timesheets late, an employee may mention a change in hours after the payroll has been run, or overtime may be recorded in several different places. The result can be an underpayment, overpayment or a payslip that does not reflect what the employee expects.
Agree one cut-off date for timesheets and payroll changes. Make it clear who is responsible for approving hours, commission, bonuses and expenses, and where that information should be sent. A simple, repeatable process is usually more useful than a complicated system no one follows.
If an overpayment does happen, handle it carefully. Employers can often recover genuine overpayments, but an early and respectful conversation matters. Check the facts first, explain the proposed repayment clearly and consider whether a reasonable instalment plan is needed.
Using the wrong tax code or National Insurance details
New starters do not always have a P45, and tax codes can change during the year. Using an estimated code, selecting the wrong National Insurance category or overlooking an HMRC notice can mean the wrong deductions are made. That can leave an employee with a tax adjustment later, which is understandably frustrating.
Collect starter information before the first payroll wherever possible. Where there is no P45, use the HMRC starter checklist and retain it with the employee’s payroll records. Check tax code notices promptly rather than assuming last month’s code is still correct.
National Insurance can be particularly easy to get wrong for younger workers, employees above State Pension age, directors and certain apprentices. The correct treatment depends on the individual and their circumstances, so it is worth checking rather than guessing.
Treating holiday pay as an afterthought
Holiday pay is not always as straightforward as paying a standard monthly salary. Staff with variable hours, irregular shifts, overtime or commission may need their holiday pay calculated using their average earnings over a reference period. Missing relevant pay can result in employees receiving less than they are entitled to.
Keep clear records of holiday taken, holiday accrued and the type of earnings each employee receives. This is especially important for part-time staff and people whose working pattern changes through the year. Employment arrangements vary, so there is no single calculation that suits every business.
Do not assume holiday can simply be paid instead of taken. Apart from limited circumstances, such as when someone leaves, workers should take their statutory holiday. Clear contracts and a reliable holiday record help avoid confusion.
Forgetting about workplace pensions
Automatic enrolment duties begin when you employ staff, even if nobody is immediately eligible to join a pension scheme. Employers need to assess their workforce, enrol eligible staff, make the right contributions and complete declarations when required. Duties continue after the initial set-up, including ongoing assessment and re-enrolment at the relevant time.
A common error is to calculate pension contributions from the wrong earnings, or to assume a staff member is not eligible without checking their age and earnings. Another is to miss the pension provider’s payment deadline after payroll has been processed.
Pension rules have details that can affect the figures, including the scheme’s definition of pensionable pay and whether contributions use qualifying earnings. Build pension checks into every payroll run so they are not left to the end of the month.
Mishandling starters and leavers
A new employee can create several payroll tasks at once: obtaining personal details, confirming their start date and pay, collecting tax information, assessing pension status and recording their contract terms. Leavers need just as much care. Their final pay may include outstanding holiday, deductions, a bonus or a repayment arrangement, and they should receive the appropriate leaving information.
Problems arise when a person is added late, their leaving date is entered incorrectly or they remain active on the system and are paid again by mistake. Keep a short starter and leaver checklist, with responsibilities and deadlines clearly assigned. It is a small safeguard that can prevent a surprisingly costly error.
Confusing employees, workers and contractors
Not everyone who provides services is necessarily an employee for tax purposes. However, calling someone self-employed or paying them from an invoice does not settle the question. Employment status depends on the real working arrangement, including control, personal service and mutual obligations.
Getting this wrong can affect PAYE, National Insurance, holiday rights and pension duties. For construction businesses, CIS adds another layer, as subcontractors may need to be verified and deductions may need to be made and reported correctly.
This is an area where taking advice early is sensible. The right answer depends on the facts, and a quick check before payments begin is usually much easier than correcting a long-running arrangement later.
Poor payroll records and weak confidentiality
Payroll records should show how pay and deductions were worked out, and employers generally need to retain PAYE records for at least three years after the end of the tax year they relate to. Records also need to be secure. Payslips, bank details, National Insurance numbers and sickness information should not be shared casually by email or left accessible to people who do not need them.
Keep records organised in one secure place and limit access appropriately. If you use cloud payroll software, make sure user permissions are reviewed when responsibilities change. Good record-keeping is not just about satisfying HMRC. It also means you can answer an employee’s question quickly and confidently.
Assuming payroll software will catch everything
Payroll software is valuable, but it only processes the data it is given. It cannot always know that a manager forgot to report overtime, that a contractual pay rise starts this month or that an employee’s circumstances have changed. Software can reduce manual calculations, but it does not replace a proper review.
Before finalising payroll, compare the total pay figure with the previous period and investigate significant changes. Check a sample of payslips, review new starters and leavers, and make sure pension and PAYE amounts are ready to be paid. A five-minute sense check can catch an error before it reaches an employee’s bank account.
A calmer way to manage payroll
The right approach depends on the size of your team, how often you pay staff and whether pay is straightforward or includes variable hours, CIS, pensions and statutory payments. For a business with two salaried employees, a simple monthly checklist may be enough. For a growing team with changing hours, a more structured process or outsourced support can save considerable time.
At Angel Bookkeeping & Payroll Services, we believe payroll should feel clear and manageable, not like a monthly worry hanging over your business. Keeping information up to date, setting realistic deadlines and asking for help before a small uncertainty becomes a larger problem gives you more time to focus on the people and work that help your business grow.