Equal Pay Day falls on 22nd November this year. It marks the point in the calendar when, based on average earnings, women effectively stop being paid compared to men. The date is symbolic, but the issue it highlights is real: women in the UK workforce earn less per hour than men, on average, across the economy as a whole.
That gap has narrowed over time. The latest figures from the Office for National Statistics show the gender pay gap for full-time employees at 6.9 per cent in April 2025, down from 7.1 per cent in April 2024. When part-time workers are included, the gap stands at 12.8 per cent. Progress is being made, but it remains slow.
What often gets lost in the conversation around Equal Pay Day, however, is what the gender pay gap actually measures and what it does not. The gap is not evidence of unlawful pay discrimination. It does not mean that women are routinely paid less than men for doing the same job. And critically, it does not tell employers whether they are complying with equal pay law. These are separate issues, and conflating them creates confusion and complacency in equal measure.
What the gender pay gap actually shows
The gender pay gap is a statistical measure. It compares median or mean hourly earnings for all male employees with all female employees across an organisation or across the economy. It reflects structural differences in the workforce: which roles men and women occupy, who works part-time, who reaches senior positions and which sectors employ more women than men.
The ONS data makes this clear. Women remain over-represented in lower-paid sectors and part-time roles, and under-represented in senior leadership and the highest-earning occupations. The gap is widest among employees aged forty and over, and largest in the most senior and highly paid roles. These patterns are the product of decades of social, economic and workplace dynamics. They are not, in themselves, evidence of unlawful discrimination.
An organisation can have a significant gender pay gap and still be paying men and women equally for equal work. Conversely, an organisation with a narrow or non-existent pay gap may still be breaching equal pay law if individuals in comparable roles are paid differently without objective justification.
What equal pay law actually requires
Equal pay law is not about statistics. It is about individuals. The Equality Act 2010 gives employees the right to equal pay for like work, work rated as equivalent under a job evaluation scheme, or work of equal value. If a woman is paid less than a man doing the same work, or work that is comparable in terms of skill, effort, responsibility and working conditions, that difference must be justified by a material factor that is not directly or indirectly discriminatory.
This is a rigorous test. It is not enough for an employer to point to historical reasons, market forces or the fact that one employee negotiated harder than another. The tribunal will examine whether the pay difference is genuinely due to a factor unrelated to sex, whether that factor is proportionate, and whether it can be objectively justified in the specific circumstances of the case.
Crucially, equal pay claims are not hypothetical. They are brought by real employees who have discovered, or suspect, that a colleague of the opposite sex in a comparable role is being paid more. Those claims are fact-intensive, document-heavy and often turn on evidence that employers assumed was buried in legacy systems or informal arrangements.
Why employers cannot rely on their gender pay gap figures
This is where the two concepts intersect in a way that creates legal risk. Many employers assume that if their gender pay gap is explained by occupational structure (eg, more men in senior roles, more women in part-time positions, etc) they are protected from equal pay claims. They are not.
The gender pay gap tells you nothing about whether comparable roles within your organisation are being paid equally. A company might legitimately have more men in senior positions, which explains its pay gap at a macro level, but that does not mean a male and female senior analyst, or a male and female department head, are necessarily being paid the same. If they are not, and the employer cannot objectively justify the difference, the law has been breached.
This is not a theoretical risk. Pay disparities accumulate over time through incremental decisions that seem insignificant at the point they are made. For example, that could be a slightly higher starting salary offered to one candidate, a discretionary bonus awarded inconsistently, a pay rise given to someone who asked while others did not, or a promotion that came with a larger increase for one individual than another. None of these decisions may have been motivated by sex discrimination, but if the cumulative result is unequal pay for equal work, the employer must justify it.
Where the risk lies in practice
Equal pay claims often arise in organisations that consider themselves progressive employers. The risk is not typically found in overt discrimination but in the gaps and inconsistencies that develop in pay systems over time.
Historic pay decisions are a common vulnerability. An employee may have been recruited years ago at a lower salary than the market rate, and subsequent pay rises have failed to close the gap. Job evaluation schemes may be outdated, failing to reflect how roles have evolved or how responsibilities have shifted. Discretionary elements of pay, including bonuses, incentive schemes and additional payments, may have been applied inconsistently without proper record-keeping or clear criteria.
Market rate arguments are sometimes advanced, but they are rarely as straightforward as employers assume. It is not enough to say that you had to pay more to attract a particular candidate. The employer must show that the higher rate was necessary, that it was applied consistently, and that it remains justified over time. If the market rate justification was valid at the point of recruitment but the roles have since converged, the defence may no longer hold.
Negotiation is another area of difficulty. Employers cannot simply rely on the fact that one employee negotiated more effectively than another. If the result is unequal pay for equal work, the question becomes whether the employer’s willingness to pay more to those who negotiate harder is objectively justified, and whether that practice has a disproportionate impact on one sex.
What employers should be doing now – Gender Gap Reporting
As a measure to address equality, the Gender Pay Gap Reporting Regulations were introduced in 2017 and made it a legal obligation for organisations with 250 or more employees to identify and report annually on their gender pay gap.
Equal Pay Day is an appropriate moment for employers to assess not just their published gender pay gap figures but the foundations of their pay structures. Waiting until a claim is brought is too late. By that point, the employee has gathered comparator evidence, the tribunal process is underway, and the employer is being asked to justify decisions made years earlier with incomplete records and fading institutional memory.
A structured pay audit is the most effective way to identify risk before it materialises. This means examining pay data at a granular level, comparing individuals in comparable roles, and testing whether any differences can be explained by legitimate, non-discriminatory factors. It is not a tick-box exercise. It requires a proper understanding of what constitutes like work or work of equal value, and a willingness to interrogate assumptions about how pay has been set and maintained.
Job evaluation schemes should be reviewed regularly, particularly in organisations where roles have changed significantly or where responsibilities have been redistributed. An evaluation that was fit for purpose a decade ago may no longer reflect the reality of how work is organised today. If the scheme is being relied upon to justify pay differences, it must be transparent, analytically sound, and free from bias.
Pay structures themselves should be clear and consistently applied. Salary bands, progression criteria, and discretionary payments should all be governed by documented policies that are applied even-handedly. This does not mean that employers cannot exercise judgment or respond to individual circumstances, but it does mean that departures from the norm must be justified in writing at the time the decision is made, not retrospectively when a claim is filed.
Transparency is increasingly expected, both legally and culturally. Employees are more informed about their rights, more willing to ask questions about pay, and more likely to compare notes with colleagues. Employers who can demonstrate that their pay decisions are based on clear, objective criteria are far better placed to defend those decisions if challenged.
Why this matters beyond compliance
Equal pay law exists because pay inequality has consequences that reach well beyond the individual claimant. It affects morale, trust, retention and reputation. It shapes who stays, who progresses and who leaves. It influences how an organisation is perceived by prospective employees, clients and the wider market.
The gender pay gap and equal pay law are addressing different dimensions of the same problem. The gap reflects structural inequality in who does which jobs and how those jobs are valued. Equal pay law ensures that within those structures, individuals are treated fairly. Employers cannot solve one without attending to the other.
Equal Pay Day will continue to be marked each year until the gap closes. In the meantime, employers would be wise to treat it not as a symbolic date but as a prompt to examine their own practices, test their assumptions, and ensure that when it comes to equal work, the pay is genuinely equal.
Whilst Equal Pay Day focuses on gender, it is also crucial not to overlook and to continue to close the gap for black, Asian, ethnic minority workers which is 6% compared to their white colleagues. This gap is estimated to amount to £3.2 billion in lost wages annually. Equal Pay Day does not address the disability pay gap either, which is higher at 12.7% representing a pay differential of £2 per hour (with the median wage for a disabled employee at £13.69 compared to a non-disabled worker at £15.69 per hour. Clearly there is some way to go before pay disparity is abolished.
