Most National Minimum Wage errors aren’t about pay rates

When employers think about National Minimum Wage (NMW) compliance, the first question is usually whether employees are being paid at least the relevant hourly rate.

In practice, many HMRC National Minimum Wage investigations have very little to do with headline pay rates.

We regularly see businesses paying above the National Living Wage only to discover that working practices, deductions from pay or salary sacrifice arrangements have unintentionally created NMW breaches.

For employers, the consequences can be significant. HMRC can seek arrears for both current and former employees, looking back up to six years. In addition, penalties can be up to 200% of the underpayment, capped at £20,000 per worker, alongside the potential reputational impact of being publicly named by HMRC.

The challenge is that many NMW issues arise from areas that employers do not immediately associate with minimum wage compliance.

Working time: The most commonly overlooked risk

One of the most frequent causes of NMW underpayments is a failure to properly identify working time.

Employers may correctly calculate hourly rates based on contracted hours, but HMRC’s assessment often extends beyond what is recorded on the payroll system.

Examples can include:

• Opening and closing duties before or after shifts.
• Security checks at the beginning or end of the working day.
• Time spent preparing equipment or workstations.
• Travel between work locations.
• Mandatory training undertaken during employment.

Training is a particularly common area of concern. Whether delivered internally or by an external training provider, mandatory training time will often need to be included when assessing compliance with National Minimum Wage requirements.

When additional working hours are not factored into calculations, the effective hourly rate can fall below the statutory minimum.

Deductions from pay can create unexpected problems

Employers are often surprised to learn that certain deductions can reduce pay for National Minimum Wage purposes, even where employees have agreed to those deductions.

Common examples include:

• Uniforms or required work clothing purchased by employees.
• Tools or equipment required to perform the role.
• Accommodation charges above the statutory accommodation offset.
• Employer-provided transport where costs are recovered through payroll deductions.
• Deductions relating to employee purchases or staff tabs in hospitality or retail environments.
• Administrative charges linked to deductions from earnings orders, such as child maintenance payments.

While each situation needs to be considered on its own facts, these types of deductions can have a direct impact on NMW calculations.

Accommodation remains a high-risk area

Accommodation provided by employers is subject to specific National Minimum Wage rules.

Where deductions exceed the permitted accommodation offset rate, employers can inadvertently create underpayments even where employees are otherwise paid above minimum wage levels.

This is an area HMRC regularly reviews and one that requires careful monitoring, particularly in sectors where accommodation forms part of the overall remuneration package.

Salary Sacrifice arrangements

Salary sacrifice arrangements can deliver valuable tax and National Insurance savings, but they can also create National Minimum Wage issues if not carefully managed.

Because salary sacrifice reduces contractual pay, employers must ensure participation in schemes does not cause earnings to fall below the relevant minimum wage thresholds.

This is particularly important when introducing new arrangements or when employees experience changes in working hours.

Why record keeping matters

National Minimum Wage investigations are often won or lost on evidence.

Employers should maintain robust records covering:

• Working hours.
• Training attendance.
• Payroll calculations.
• Deductions from pay.
• Accommodation arrangements.
• Salary sacrifice elections.

Without adequate records, it can be difficult to demonstrate compliance if HMRC raises concerns.

The cost of getting it wrong

National Minimum Wage breaches can quickly become expensive.

HMRC can require employers to:

• Repay arrears to both current and former employees.
• Correct historic underpayments going back up to six years.
• Pay penalties of up to 200% of the arrears identified.
• Manage the reputational impact of public HMRC enforcement activity.

For many businesses, the greatest risk is not deliberate non-compliance but the accumulation of small issues over several years that only come to light during an HMRC review.

Taking a proactive approach

National Minimum Wage compliance is about far more than ensuring employees are paid above the statutory hourly rate.

Employers should regularly review working practices, deductions from pay, accommodation arrangements and salary sacrifice schemes to ensure they remain compliant.

Identifying and addressing issues early is almost always less costly than dealing with the consequences of an HMRC investigation.

Director Comment

“The majority of National Minimum Wage issues we encounter are not caused by employers deliberately underpaying staff. More often, they arise from technical rules around working time, deductions and payroll processes that have been overlooked over a period of years.”arly, helping management teams make informed decisions with confidence as their organisations evolve.