National Minimum Wage Guide

You hire your first member of staff. You set their hourly rate, put them through payroll, and move on.

Six months later you spot an anomaly: a worker enrolled in your salary sacrifice cycle-to-work scheme is, after the deduction, earning just below the legal minimum. No one flagged it.

You had no idea it was happening.

That scenario is one of the most common ways UK employers breach National Minimum Wage law. The breach is real, HMRC’s penalties are not minor, and “I didn’t know” is not a defence.

This guide explains what the National Minimum Wage and National Living Wage rules actually require, the April 2025 rates by age band, what counts as qualifying pay, where employers most commonly slip up, and how HMRC investigates and penalises non-compliance.

What is the difference between the National Minimum Wage and the National Living Wage?

Both are legal pay floors set by the UK government. The distinction matters because employers sometimes conflate them and misapply the wrong rate.

The National Living Wage (NLW) is the higher rate, and it applies to workers aged 21 and over. The name can mislead: it is not the same as the “real Living Wage” published by the Living Wage Foundation, which is a voluntary benchmark set higher than the legal minimum.

The NLW is a statutory floor, not a recommendation.

The National Minimum Wage (NMW) applies to workers under 21 and to apprentices, with rates that vary by age band.

As of 1 April 2025, the rates are:

Age group	Hourly rate
21 and over (NLW)	£12.21
18 to 20	£10.00
Under 18	£7.55
Apprentice	£7.55

The apprentice rate applies if the worker is under 19, or is 19 or over and in the first year of their apprenticeship.

Once an apprentice turns 19 and completes year one, they move to the NMW rate for their age. An apprentice aged 21 who finishes their first year is entitled to £12.21 per hour, not the £7.55 apprentice rate.

This is one of the most common miscalculations we see in employer payrolls.

The rates change on 1 April every year. You need a process to update them automatically, not a reminder on a sticky note.

What counts as pay for NMW purposes?

This is where most payroll errors originate. The legal minimum is calculated against gross pay before tax in a pay reference period (typically four weeks or a calendar month), divided by the hours worked.

But not everything in a payslip counts as qualifying pay.

What counts:

• Basic wages and salary
• Performance bonuses and output-related payments
• Tips paid through the payroll

What does not count:

• Tips paid directly to the worker in cash (not through payroll)
• Employer pension contributions
• Loans or advance payments
• Payments for expenses reimbursed

Deductions that reduce qualifying pay for NMW purposes:

• Salary sacrifice arrangements (cycle-to-work, childcare vouchers, pension contributions made via sacrifice)
• Deductions for employer-provided accommodation (above the accommodation offset rate)
• Deductions for uniforms, tools, or equipment that the employer requires

This is the mechanism that catches employers off guard. A worker earning £12.30 per hour who sacrifices £0.15 per hour into a pension scheme is effectively receiving £12.15, which is below the NLW.

The salary sacrifice is voluntary in theory. But once it pushes qualifying pay below the minimum, the arrangement is unlawful. HMRC does not treat “the worker agreed to it” as an acceptable explanation.

If you run any salary sacrifice scheme, you need to check that no worker’s qualifying pay drops below the age-appropriate rate after the deduction is applied. That check needs to happen every pay run, not annually.

How does HMRC enforce the National Minimum Wage?

HMRC has a dedicated NMW enforcement team and investigates complaints from workers, referrals from ACAS, and its own risk-based analysis of employer payroll data.

You do not have to be a large employer to be investigated.

When HMRC identifies a breach, the consequences are:

Arrears notice: You must repay all underpaid workers the full shortfall, calculated at current rates even if the underpayment occurred years earlier.

Penalty: HMRC charges a penalty of 200% of the total arrears. That penalty is halved if you pay within 14 days. The minimum penalty is £100; the maximum is £20,000 per worker.

Naming and shaming: Since 2013, HMRC has published lists of employers who breach NMW rules. The scheme is not a deterrent for most large employers who already comply.

It is a real risk for SMEs and growing businesses who make administrative errors and are then publicly listed alongside deliberate bad actors. The reputational damage in a tight labour market is significant.

Criminal prosecution: Deliberate non-compliance and obstruction of HMRC investigations can result in prosecution. This is rare but it does happen.

The financial exposure adds up quickly. Five workers underpaid by £0.30 per hour, for 40 hours per week, over 12 months: that is approximately £3,120 in arrears, plus a penalty of up to £6,240, potentially before legal costs.

We think that exposure is hard to justify when a payroll audit costs a fraction of a single enforcement action.

Where do UK employers most commonly get it wrong?

We reviewed HMRC enforcement data, ACAS guidance, and case patterns from employment tribunals. The violations cluster around a handful of recurring mistakes.

Most of these are administrative errors rather than deliberate underpayment, which makes early detection and self-correction the most practical risk management posture.

Salary sacrifice arrangements. As explained above: any deduction that reduces qualifying pay below the floor is a breach, regardless of whether the worker agreed to it.

Uniform and equipment deductions. If you require workers to buy a uniform, equipment, or tools for the job, and you deduct the cost from their pay, those deductions reduce NMW-qualifying pay. Providing a branded T-shirt and then charging the worker for it is not merely poor practice.

It is a legal exposure.

Travel time. Workers travelling between appointments during the working day, or travelling to a first client that is not a fixed location, are usually entitled to NMW for that travel time. The specific rule depends on the type of work arrangement.

Home care workers are one of the most frequently investigated groups for exactly this reason.

Piece-rate and output work. Workers paid per item or output must still receive at least the NMW when their effective hourly rate is calculated.

Employers sometimes set piece rates that looked acceptable at target output, then fail when workers’ actual output is lower.

Age-band errors. Workers turn 18, 21, or complete their apprenticeship year, and the payroll is not updated.

These are not trivial oversights: HMRC treats them as breaches from the date the age change occurs, not from when you notice it.

Unpaid working time. Required training before a shift, mandatory handover periods, or time spent on employer premises before clocking in: if the employer requires it, it usually counts as working time for NMW purposes.

If your payroll is not capturing this time, you are likely underpaying and may not know it.

What records do you need to keep?

Employers must keep sufficient payroll records to demonstrate NMW compliance. Across HMRC guidance, record-keeping failures are one of the factors that escalate a routine investigation into a penalty case.

HMRC can require you to produce records going back six years.

Your records need to show hours worked, pay received, and the calculation that confirms qualifying pay exceeded the applicable rate. Payroll software that logs these fields is the minimum.

Spreadsheets maintained manually carry a documentation risk: gaps and inconsistencies are harder to defend.

Workers have the right to request their NMW records at any time. You must provide them within 14 days. If you cannot, that gap becomes evidence of non-compliance rather than just an administrative oversight.

What should you do now to bring your NMW compliance up to date?

The most immediate action is a compliance check across your current payroll. That means:

1. Confirming every worker’s age-appropriate rate from 1 April 2025.
2. Identifying all salary sacrifice deductions and recalculating qualifying pay post-sacrifice.
3.

Checking whether any deductions for uniforms, tools, or equipment reduce pay below the floor.
4. Confirming that apprentices past their first year are on the age-appropriate rate, not the apprentice rate.
5.

Reviewing how your payroll handles part-month starters and leavers, where hourly calculations can diverge from the pay period expectations.

If you find a historic underpayment, take advice before approaching HMRC. Voluntary disclosure is treated more favourably than a discovered breach, but the timing and framing matter.

For employers hiring their first employee, or for small HR teams managing payroll manually, this is one area where payroll software with built-in minimum wage alerts is a material risk-reduction tool, not a convenience.

UK National Minimum Wage: your questions answered

Does the National Living Wage apply to part-time workers?
Yes. The NLW and NMW are hourly rates. They apply regardless of how many hours are worked.

A worker on two hours per week at age 21 is entitled to £12.21 per hour.

Do the rates apply to self-employed workers?
No. NMW applies to “workers” as defined under the National Minimum Wage Act 1998. Genuine self-employed contractors are not covered.

However, HMRC scrutinises worker classification closely, and misclassifying an employee or worker as self-employed carries its own serious risks.

Can employees agree to be paid below the minimum wage?
No. Any contractual term or agreement that results in payment below NMW is void. The statutory floor cannot be waived.

What is the real Living Wage and do employers have to pay it?
The real Living Wage is a voluntary rate set by the Living Wage Foundation, currently higher than the NLW. It has no legal status.

Employers who commit to paying it do so voluntarily. It is worth knowing the difference if employees ask why their wage does not match what they have seen quoted in the press.

I run a salary sacrifice pension scheme. How do I check compliance?
For each pay run, calculate the worker’s qualifying pay after the salary sacrifice deduction, then divide by hours worked.

If the result is below their age-appropriate rate, the sacrifice amount must be reduced to bring qualifying pay back to the legal floor. Most modern payroll software can automate this check.