Is Timesheet Rounding Legal in the UK?
Search for guidance on timesheet rounding and most of what comes back will tell you about the "seven-minute rule": round to the nearest quarter hour, and anything under seven minutes rounds down. It sounds authoritative. It is quoted in HR forums, built into payroll systems, and written into UK staff handbooks.
It is American. It comes from regulations under the US Fair Labor Standards Act and has no equivalent in UK law whatsoever. A UK employer applying it is not following a rule — they are following someone else's rule, and possibly accruing minimum wage arrears while doing so.
This guide sets out what UK law actually requires, when rounding becomes a genuine liability, and why the safest answer is usually to stop rounding altogether.
The Short Answer
There is no UK legislation that prohibits rounding recorded working time. There is also no legislation that permits it, no safe-harbour threshold, and no de minimis rule.
What there is instead is a simple obligation that cuts across the whole question: workers must be paid at least the National Minimum Wage for all the time they work. If your rounding practice means someone is not paid for time they actually worked, and that shortfall takes their average hourly rate below the minimum wage in a pay reference period, you have underpaid — regardless of how reasonable the rounding convention seemed.
Rounding is not illegal. Underpaying is. The question is never "am I allowed to round?" but "does my rounding ever leave someone paid below the minimum for hours they genuinely worked?"
Why HMRC Cares About This
Rounding down recorded hours appears regularly in HMRC's own material on common causes of minimum wage underpayment, alongside unpaid pre-shift briefings, unpaid security checks and deductions for uniforms.
It attracts attention because it is systematic. A single unpaid ten minutes is trivial. The same ten minutes, twice a day, across 60 staff, across a year, is roughly 5,000 hours — and because it is generated by a rule rather than an oversight, it is easy for HMRC to quantify from your own data once they have it.
The Consequences
| Consequence | Detail |
|---|---|
| Arrears | Repaid to workers, and calculated at current minimum wage rates rather than the rate at the time |
| Penalty | Up to 200% of the underpayment, subject to a statutory maximum per worker |
| Naming | Public naming by government, which is generally the part employers mind most |
| Tribunal claims | Unlawful deduction from wages claims brought by workers directly |
The arrears point is worth dwelling on. An underpayment from three years ago is repaid at today's rates, so the bill grows every year you fail to notice it.
Neutral Rounding vs Rounding Down
Employers usually operate one of three patterns:
| Pattern | Example | Risk |
|---|---|---|
| Always down | Clock in 8.52, recorded 9.00 | High — systematic underpayment |
| Neutral | 8.52 → 8.45; 8.53 → 9.00 | Moderate — evens out on average, but not guaranteed per worker per period |
| Always up | 8.52 → 8.45 start, paid from 8.45 | Low — you are paying more than required |
Neutral rounding is often assumed to be safe because it balances out. It does balance out — across a large population, over a long period. Minimum wage compliance is not assessed that way. It is assessed per worker, per pay reference period. A worker who happens to round down in four consecutive weeks has been underpaid in each of them, and the fact that a colleague rounded up is no defence.
There is also a behavioural problem: neutral rounding rarely stays neutral. Staff quickly learn to arrive at 8.53 rather than 8.52, and the distribution stops being symmetrical.
What Counts as Working Time Anyway
Rounding disputes often turn out to be arguments about what should have been on the clock in the first place. Under the Working Time Regulations 1998, working time includes any period when the worker is working, at the employer's disposal and carrying out their duties.
Time that is frequently missed:
- Mandatory handover or briefing before the shift start time
- Setting up equipment or opening up premises
- Travel between assignments during the working day, for mobile workers
- Required training
- Time spent waiting at the employer's disposal
If your rota says 9.00 but your process requires people to be there at 8.50, the ten minutes is working time and rounding it away compounds the problem. Our guide to the legal requirements for tracking employee hours covers the wider record-keeping duties.
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Why Rounding Exists at All
It is worth remembering where the practice came from. Rounding to the quarter hour made sense when a payroll clerk was adding up card-punch times by hand across 200 staff. Quarter hours are easy to add. Minutes are not.
That constraint disappeared some time ago. A system that records 8.52 can multiply 8.52 by an hourly rate as easily as it can multiply 9.00. The arithmetic argument for rounding no longer exists, which leaves only the scheduling argument — and scheduling and payment do not have to use the same number.
What to Do Instead
- Record actual times. This alone removes the entire category of risk.
- Separate scheduling from payment. Round for the rota if it helps people read it. Pay on the recorded minute.
- Handle lateness as conduct, not arithmetic. If someone is consistently ten minutes late, that is a management conversation, not a reason to build a rounding rule that also penalises the person who arrives early.
- Audit what happens before the shift starts. Briefings, handovers and set-up are the most commonly unpaid working time.
- If you keep rounding, round in the worker's favour and document that you do.
- Check the pay reference period, per worker. Averages across the workforce prove nothing.
- Keep the records. Six years for minimum wage purposes, two for Working Time Regulations. The evidential burden in a minimum wage dispute sits with the employer.
For the underlying record-keeping obligations, see our guide to HMRC timesheet requirements, and the UK minimum wage calculator for checking current rates against actual hours.
Does This Apply to Salaried Staff?
Employers often assume rounding is only a risk for hourly-paid workers. It is not. The National Minimum Wage applies to salaried employees too — their annual salary is simply divided across their basic hours to produce an effective hourly rate.
Salaried-hours work has its own set of minimum wage rules, including a defined calculation year and treatment of hours worked in excess of the basic annual hours. An employee on a modest salary who consistently works unrecorded additional hours can fall below the minimum, and the fact that nobody was clocking in and out does not help you — the absence of records shifts the evidential burden onto the employer.
This is one of the more compelling reasons to record hours for salaried staff even where you have no intention of paying by the hour.
Key Takeaways
- Rounding is not prohibited in the UK, but there is no safe-harbour rule permitting it either
- The seven-minute rule is US law and does not apply here
- Minimum wage compliance is assessed per worker per pay reference period, so "it evens out" is not a defence
- Rounding down appears in HMRC's own list of common minimum wage errors
- Arrears are repaid at current rates, with penalties of up to 200% and public naming
- Pre-shift briefings, set-up and required training are working time and are often missed
- Record exact times — the arithmetic reason for rounding disappeared with manual payroll
Frequently Asked Questions
Is it legal to round timesheets in the UK?
No law bans rounding outright. But workers must be paid for all the time they work, so rounding that systematically reduces recorded hours can produce National Minimum Wage arrears and HMRC penalties.
Does the 7-minute rule apply in the UK?
No. The seven-minute rule comes from the US Fair Labor Standards Act and has no equivalent in UK law. There is no de minimis threshold below which unpaid working time can be ignored here.
Can I round clock-in times to the nearest 15 minutes?
Only if it is genuinely neutral and never leaves a worker below the minimum wage in any pay reference period. Rounding that only ever goes in the employer's favour is the pattern HMRC looks for.
What are the penalties for underpaying the minimum wage?
HMRC can require arrears to be repaid at current rates and issue a penalty of up to 200% of the underpayment, subject to a statutory maximum per worker. Employers can also be publicly named by the government.
How long must I keep timesheet records?
National Minimum Wage records must be kept for six years for pay reference periods starting on or after 1 April 2021. Working Time Regulations records must be kept for two years.
Should I round or record actual times?
Record actual times. Modern systems capture the real minute at no extra cost, and rounding exists mainly as a legacy of manual payroll arithmetic that no longer needs to be done by hand.
Sources
- Calculating the minimum wage — GOV.UK
- National Minimum Wage Regulations 2015 — legislation.gov.uk