Minimum wage underpayment: UK job costs and unpaid hours

Minimum wage underpayment in the UK can happen even when your advertised hourly rate looks correct. Required spending on uniforms or equipment, alongside working time missing from payroll, can change the assessment. Check your actual hours, job-related costs and applicable rate, then seek clarification or use the official complaints route.

• A headline hourly rate does not settle whether all your work has been paid correctly.
• Required job expenses and unpaid duties can reveal a shortfall.
• Keep payslips, receipts and records of work before raising a concern.
• UK complaints follow UK rules; Canadian workers need the relevant Canadian process.

Why can minimum wage underpayment hide behind a correct rate?

The number in your contract is only the starting point. The assessment also considers which payments count and the working time covered by them. A payslip can therefore appear consistent with the advertised rate while leaving important duties or expenses out of view.

According to GOV.UK guidance checked in October 2026, unreimbursed purchases needed for a job, including uniforms and tools, affect minimum wage pay. Its employer checklist also identifies unpaid work around shifts as a recurring source of mistakes. These are practical checks, not proof that every deduction or extra minute automatically creates a breach.

This guide concerns UK minimum wage rules, with the complaints guidance particularly relevant to readers in Great Britain. It does not describe Canadian legal entitlements. Canadian readers comparing a wage change with their payroll can instead use our guide to Ontario minimum wage and pay-stub checks, while checking which jurisdiction covers their employment.

Which deductions and job costs need a closer look?

Start by separating money spent because the job requires it from ordinary deductions on a payslip. GOV.UK distinguishes required work purchases from Income Tax and National Insurance contributions. A lower bank deposit after tax is not, by itself, evidence of minimum wage underpayment.

Look beyond deductions printed on the payslip

A work expense can matter even if you paid a shop directly rather than having money withheld by payroll. Keep receipts for clothing, tools or safety equipment that the employer required and did not reimburse. Include the instruction asking you to buy them, where available.

Do not assume that every purchase connected with work has identical treatment. GOV.UK treats voluntary purchases differently from required job costs, and employer-provided accommodation has separate rules. Where the position is unclear, describe the expense precisely rather than labelling all deductions unlawful.

Tips and certain extra payments also need care. GOV.UK excludes tips and additional pay for unsocial shifts from the minimum wage calculation. An overall pay packet that looks reasonable does not necessarily resolve whether the underlying minimum wage requirement was met.

What working time might payroll have missed?

Compare the duties you actually performed with the hours recorded, not just the rota you were originally given. The official checklist highlights handovers and entry or exit security procedures as examples of additional time that can be overlooked. It also flags required availability during a shift, even when there is no task to complete.

Separate work duties from assumptions about travel

Training and business travel can also require attention under the working-time rules. Avoid treating all travel as interchangeable: travelling for work is not simply the same question as your ordinary journey to the workplace. Record the purpose, locations and instructions so an adviser can assess the circumstances.

A salary is not an automatic answer either. GOV.UK’s checklist warns that excess hours can produce minimum wage underpayment for salaried workers. If your hours regularly extend beyond the stated pattern, keep a contemporaneous record rather than relying on your contract alone.

1. Match each payslip to the period it covers.
2. Compare recorded hours with shifts, training and additional required duties.
3. List required purchases and whether reimbursement arrived.
4. Check the rate applicable to your circumstances and the period concerned.
5. Write down discrepancies and retain the documents supporting them.

How can you raise a pay discrepancy without losing the evidence?

A focused written question gives payroll something concrete to investigate. Identify the pay period, the missing duty or expense, and the record supporting your query. Ask how it was treated in the minimum wage assessment rather than relying only on the amount reaching your bank account.

Keep your own copies of relevant payslips, rotas, receipts and messages about required duties. A dated note made near the event can help explain differences between scheduled and actual work. Distinguish facts you can document from details you are unsure about.

According to GOV.UK, employers who discover they have paid below the applicable minimum wage must repay the arrears. However, an expected correction is not the same as money already received. While a discrepancy remains unresolved, check forthcoming bills against available funds rather than assuming payroll will fix it before a payment falls due.

If a short wage payment could affect card repayments, our guide to checking a first credit card bill in the UK and Canada explains the statement details to review. That is a separate budgeting check, not a substitute for pursuing missing wages.

When can you use the official complaints route?

GOV.UK provides an online pay and work rights complaint form covering minimum wage concerns. Its guidance, checked in October 2026, says you can report an employer after leaving the job. It also allows someone else to complain on your behalf, although HMRC needs your permission.

If you do not want HMRC to identify you to the employer as the complainant, state that request on the form. This is worth raising explicitly rather than assuming your preferences will be inferred. The guidance also points to the Acas helpline for difficulties using the form, including translation support.

The route matters if you are considering legal action. GOV.UK says HMRC cannot take forward the minimum wage complaint if tribunal action on that issue has already begun. Seek advice about your circumstances before assuming that both routes can proceed together.

Informational content only, not financial advice.