National Minimum Wage Compliance: The Record-Keeping HMRC Checks

If you employ staff in a pub, a shop, a salon or a small kitchen, National Minimum Wage (NMW) compliance is not just about the hourly rate you advertise. It is about being able to prove, with records, that every worker was actually paid at least the legal minimum for every hour they worked. That distinction catches out a lot of well-meaning employers, and it is exactly what HMRC looks at when it comes calling.

The good news is that the rules are clear and the paperwork is manageable once you know what is expected. This guide walks through the records you need to keep, why they matter, and how tamper-proof digital time records make an inspection far less stressful.

What records does HMRC actually check in an NMW inspection?

Under the National Minimum Wage Regulations 2015, employers must keep records that are sufficient to show that each worker has been paid at least the minimum wage for the relevant pay reference period. HMRC enforces this on behalf of the government, and its officers can inspect your records, visit your premises and interview both you and your staff. In practice, an inspection focuses on whether your figures add up when hours worked are compared against pay received.

The records typically examined include:

• Hours worked by each worker in each pay reference period, including start and finish times and any unpaid breaks.
• Gross pay and the hourly rate that results once you divide pay by hours actually worked.
• Deductions from wages, such as amounts for uniforms, tools, tills that come up short, or accommodation, because these can push effective pay below the minimum.
• Age and date of birth details, since the minimum wage rate depends on the worker's age band and apprentice status.
• Contracts, rotas and payslips that tie the hours and the pay together.

The core test is simple: divide what someone was paid by the number of hours they genuinely worked. If the result falls below the minimum for their age, you have an underpayment, even if it was an honest mistake.

Why do so many honest employers fail an NMW check?

Most NMW underpayments are not deliberate. They come from ordinary situations that quietly eat into the effective hourly rate. Recognising these traps is half the battle:

• Unpaid working time. Time spent opening up, cashing up, attending a team briefing, or waiting for a late customer to leave is working time. If staff clock off at closing time but keep working, those minutes still count.
• Rounding errors. Rounding shifts down to the nearest quarter or half hour, shift after shift, can add up to a shortfall across a pay period.
• Uniform and equipment costs. If a worker has to buy a specific uniform or tools, that cost can be treated as reducing their pay for NMW purposes.
• Salaried staff on long weeks. A fixed salary divided by unusually long hours during a busy period can dip below the minimum.
• Missing or vague records. If you cannot show exactly how many hours someone worked, it is difficult to prove you paid them correctly, and the burden of showing compliance sits with the employer.

The pattern is consistent: the businesses that struggle are usually the ones relying on memory, scribbled rotas or a spreadsheet that anyone can overwrite. When the records are thin, disputes become your word against the worker's, and that is a weak position in front of an inspector.

What makes a working-hours record strong enough to rely on?

A record is only as useful as it is trustworthy. In an inspection, the questions an officer is really asking are: were these hours captured accurately at the time, and could they have been altered afterwards? A strong record answers both clearly.

Good working-hours records generally share a few qualities:

• Captured at the moment. Times logged when a worker actually starts and finishes, rather than reconstructed at the end of the week, are far more reliable.
• Attributable to a specific person. Each entry should clearly belong to one named worker, so there is no confusion over who did what.
• Tamper-evident. If a record can be quietly edited after the fact, its value drops. Records that show a clear history, and flag any changes, carry much more weight.
• Complete and consistent. Breaks, overtime and early starts should all be captured the same way every time, not left to guesswork.
• Retained for the legally required period. You must keep NMW records for the period set out in law. If you are unsure how long that is for your situation, check the current guidance on gov.uk rather than guessing.

This is where tamper-proof digital records make a real difference. When clock-in and clock-out times are recorded automatically, timestamped, tied to a named employee and stored so they cannot be silently rewritten, you move from "we think this is roughly what happened" to "here is exactly what happened, and it has not been changed." That is the kind of evidence that shortens an inspection and protects you if a former employee raises a complaint.

How can a small business keep these records without extra admin?

Plenty of owners assume accurate time records mean more paperwork or an expensive system nobody will use. In reality, the aim is to make capturing hours effortless so it actually happens on every shift. A few practical steps help:

• Make clocking in frictionless. If it takes seconds and works with tools staff already have, they will do it consistently.
• Record breaks separately. Keep paid and unpaid time distinct so your hourly calculation is right first time.
• Review pay against hours each period. A quick check that pay divided by hours clears the minimum for each age band catches problems before HMRC does.
• Keep everything in one place. Storing hours, rotas and pay together makes producing records on request straightforward.

This is the thinking behind Kiwii. Staff can clock in and out straight from WhatsApp with no app to install, or use the mobile app or a smartwatch, and each entry is timestamped, linked to the individual and stored as a tamper-proof record with optional geolocation. If HMRC ever asks how many hours a worker did last March, the answer is a few clicks away rather than a scramble through paper rotas.

Kiwii shows UK pricing in GBP and is built for exactly the kind of hospitality, retail and salon businesses that face the most NMW scrutiny. Getting your working-hours records right will not make an HMRC inspection enjoyable, but it can make it a formality rather than a threat.

Worried your current records would not hold up to an inspection? Take a look at how Kiwii captures tamper-proof working hours, and give yourself one less thing to lose sleep over.