What pay equity analysis actually measures

Pay equity analysis is a systematic examination of an organisation's compensation data designed to identify salary differences between employees in comparable situations that cannot be justified by legitimate factors. It is not a subjective assessment of whether pay feels fair — it is a quantitative analysis of whether pay actually is consistent when controlling for the factors that legitimately affect compensation.

The analysis starts with the raw pay data: every employee's base salary, and optionally bonus and total compensation. It then applies a set of control variables — role, job level or grade, tenure in role, tenure at the organisation, performance rating, qualifications where relevant — to create groups of employees whose situations are genuinely comparable. Within those comparable groups, any remaining pay differences are examined. Those that can be attributed to the control variables are considered explained. Those that cannot are the unexplained gaps that require investigation and, where confirmed as unjustifiable, remediation.

Pay equity analysis is typically conducted across demographic dimensions: gender, ethnicity, age, and other protected characteristics depending on jurisdiction and organisational priorities. The analysis does not assume that differences in pay across these dimensions are discriminatory — they may have legitimate explanations that the analysis reveals. But it ensures that the question is examined with data rather than assumption, and that any genuine disparities are identified and addressed rather than left to accumulate unexamined.

For organisations required to report pay gap data to regulators — which is a growing requirement in many jurisdictions — the pay equity analysis also produces the data needed for compliance reporting. But regulatory compliance is the floor, not the ceiling. The value of pay equity analysis extends well beyond what is required to report publicly: it reveals the actual state of compensation fairness within the organisation and identifies specific, addressable problems.

Equal pay vs pay equity: an important distinction

The terms "equal pay" and "pay equity" are frequently used interchangeably, which creates confusion about what each concept requires and what different legal frameworks mandate. The distinction matters practically because an organisation can be legally compliant with equal pay requirements while still having significant pay equity problems.

Equal pay is a specific legal concept: it prohibits paying an employee less than a comparator employee for the same job, or a job of equal value, on the basis of a protected characteristic. The legal test is narrow — it asks whether two specific individuals in comparable roles are paid the same. An equal pay claim arises when a specific employee identifies a specific comparator and can demonstrate that the pay difference is attributable to a protected characteristic.

Pay equity is broader. It examines fairness across the entire organisation — not just whether individual comparators are paid the same, but whether the overall pattern of compensation is equitable across demographic groups. A company could be paying every man and every woman in the same role the same salary — equal pay compliance — while having a significant gender pay gap at the organisational level, because women are systematically concentrated in lower-paid roles, excluded from higher bonus categories, or under-represented in senior grades where pay is highest. Equal pay compliance does not address these structural patterns.

For HR, the practical implication is that equal pay compliance is a necessary but not sufficient condition for pay equity. Organisations that aim only for equal pay compliance may still have substantial disparities in actual pay outcomes across demographic groups — disparities that are legally risky in an environment of increasing pay transparency, employee awareness and regulatory scrutiny, and that are also genuine fairness problems regardless of their legal status.

Unadjusted vs Adjusted Pay Gap: Why the Distinction Matters

Pay gap analysis produces two distinct figures that are frequently confused in public reporting. The unadjusted (or raw) pay gap is the overall difference in average pay between, for example, male and female employees — calculated across the entire workforce without controlling for any other factors. The adjusted (or controlled) pay gap compares employees in genuinely comparable situations — same role, level, tenure and performance — and measures the difference that remains after those legitimate factors are accounted for. The unadjusted gap is a useful indicator of structural patterns (occupational segregation, representation gaps at senior levels) but is not a measure of discriminatory pay practices. The adjusted gap is a more direct measure of whether the organisation is paying people differently for comparable work. Both figures are important, but they answer different questions and must not be conflated.

How to conduct a pay equity audit step by step

A credible pay equity audit follows a structured methodology that ensures the findings are defensible — both internally and if scrutinised by regulators or in litigation. An ad hoc review of salary data without a defined methodology produces conclusions that are difficult to defend and easy to dispute. The following sequence represents best practice.

Step 1: Define the scope and comparator groups. Before pulling any data, define which employee population the audit covers (typically all permanent employees; temporary and contractor populations may require separate analysis), which demographic dimensions will be examined, and how comparator groups will be constructed. Comparator groups are the heart of the audit: they must group employees whose situations are genuinely comparable while being specific enough to be meaningful. The most common structure uses job family and level — all employees in the same role at the same grade — as the primary comparator group.

Step 2: Collect and validate the data. The data required for a pay equity analysis includes, at minimum: employee identifier, job title, job family, job level or grade, base salary, department, manager, gender and any other demographic dimensions being examined. Additional useful data includes: tenure in role, tenure at the organisation, most recent performance rating, and any market adjustment or retention bonuses that form part of regular compensation. The data must be validated for completeness and accuracy before analysis begins — missing data, role miscategorisation or salary entry errors will produce misleading results.

Step 3: Calculate unadjusted gaps. The unadjusted gap calculation is straightforward: for each demographic dimension, compare the median (preferred over mean, which is more susceptible to outlier distortion) pay of each group. This provides the headline figure — the overall difference in pay outcomes before any adjustments. For gender, for example, this is the percentage difference between median male pay and median female pay across the entire analysed population.

Step 4: Conduct the adjusted analysis within comparator groups. Within each comparator group, examine whether there are pay differences across demographic lines. At this stage, apply any additional control variables for which you have data — tenure, performance rating — to further isolate differences that cannot be explained by legitimate factors. Any remaining difference within a well-defined comparator group, after accounting for all available legitimate explanatory variables, is the adjusted gap for that group — the figure that most directly indicates a potential equity problem.

Step 5: Statistical significance testing. For comparator groups with sufficient population to support statistical analysis, apply statistical significance tests to determine whether observed differences are likely to reflect a real pattern or could be explained by chance variation in a small sample. This step prevents over-reacting to apparent gaps in small groups that may not be statistically meaningful, while ensuring that genuine patterns in larger populations are identified even when individual differences are small.

Step 6: Individual case review of flagged gaps. Any statistically significant gap identified in the adjusted analysis triggers an individual case review — examining the specific employees contributing to the gap to determine whether there are legitimate explanatory factors that were not captured in the quantitative analysis. This is where the audit transitions from data analysis to HR judgement. Some gaps will have clear, legitimate explanations (a niche technical skill that commands a market premium; a retention adjustment made in response to a specific competitive offer). Others will not.

Pay Equity Analytics in Treegarden HR

Treegarden's HR analytics module enables HR leaders to compare salaries across roles, levels and demographic groups to surface unexplained disparities requiring investigation. The analytics view presents comparisons within defined job families and levels, with configurable demographic dimensions, producing both the unadjusted gap figure and the within-group comparison that isolates potential equity issues from structural representation patterns. HR can drill into specific comparator groups and individual cases directly from the analytics view, reducing the time required to move from data to actionable findings.

Common causes of pay gaps: legitimate and illegitimate

Understanding the causes of pay gaps is essential for designing effective remediation. Not all pay differences represent problems — some reflect genuine, legitimate differences in market value, individual contribution or negotiation history. The audit's purpose is not to eliminate all pay variation but to distinguish the legitimate from the illegitimate.

Legitimate causes include genuine differences in market value for specific skills within a role (a software engineer with a rare specialisation may justifiably earn more than a generalist peer in the same job family); documented performance differences that have translated into merit increases over time; tenure-based increases where pay has grown with years of experience; and market adjustments made for specific individuals to prevent attrition in a competitive talent market. These causes are defensible when they are documented, consistently applied and proportionate.

Structurally problematic but not discriminatory causes include starting salary negotiation disparities — where employees who negotiated more aggressively at hire are still earning more than colleagues who started at a lower salary and received the same percentage increases over time; manager discretion in merit increase allocation applied inconsistently across the organisation; and role reclassification or restructuring that left historical pay anomalies embedded in the current salary structure without correction.

Potentially discriminatory causes include pay decisions that, even if not overtly motivated by protected characteristics, have systematically disadvantaged employees from particular demographic groups — for example, systematically lower starting salaries offered to women who did not negotiate as aggressively as their male counterparts; merit increases consistently allocated at lower rates to employees from particular ethnic groups across multiple managers and years; or promotion decisions that advance employees of one demographic faster, leaving others at lower salary levels for longer.

The audit cannot always definitively determine which category a specific gap falls into — some cases require individual investigation and management judgement. But the audit can identify which gaps warrant that investigation, which is the essential first step.

Analysing audit results: what's explainable and what isn't

The output of the audit analysis is a set of findings: comparator groups where gaps exist, the size of those gaps, whether they are statistically significant, and the preliminary assessment of whether known data factors explain them. Interpreting these findings requires both analytical rigour and HR judgement.

Start with the largest and most statistically significant gaps. These are the cases where the potential legal exposure is greatest and the potential employee impact is most severe. Large, unexplained gaps in specific comparator groups warrant immediate individual case review to determine whether legitimate explanatory factors exist that were not captured in the quantitative data.

Distinguish between individual anomalies and systematic patterns. An individual within a comparator group who is paid substantially more or less than their peers may reflect a one-off situation — a specific retention arrangement, a historical anomaly from an acquisition — rather than a systematic problem. A pattern where all or most employees of a particular demographic group are paid less than their peers across multiple comparator groups is a systemic issue that points to a process problem, not just a collection of individual cases.

Document the explanatory analysis carefully. For every identified gap, the audit record should capture the finding, the individual case review outcomes, the legitimate explanatory factors identified (with the evidence supporting them), and the residual unexplained gap after those factors are accounted for. This documentation is the organisation's evidence that the audit was conducted rigorously and in good faith — and that gaps with legitimate explanations were properly assessed rather than dismissed without analysis.

Fix the Process Before Fixing the Numbers

The most common mistake in pay equity remediation is adjusting the current pay gaps without addressing the decision-making processes that created them. If the audit reveals that starting salaries have been systematically set lower for women candidates, adjusting current salaries closes today's gap — but next month's new hire will still enter the organisation at a lower salary if the starting pay decision process has not changed. Effective remediation has two tracks: closing identified current gaps through salary adjustments, and fixing the processes — how starting salaries are determined, how merit increases are allocated, how promotion decisions are made — that produced those gaps. Without process changes, the gaps will recur.

Closing identified gaps: a phased remediation approach

When the audit has identified unexplained pay gaps that cannot be attributed to legitimate factors, the organisation must develop a remediation plan. The plan should be specific, prioritised and time-bound — not an aspiration to "address pay equity going forward" but a defined set of salary adjustments with amounts, effective dates and the employees affected.

Prioritisation by gap size and population. Remediation resources are finite. The first priority should be the largest unexplained gaps, which carry the greatest legal exposure and represent the greatest individual financial harm. Within the same gap size, priority should be given to comparator groups with the largest population of affected employees, since these represent the most systematic problems.

Phased implementation over the annual review cycle. Closing all identified gaps in a single cycle may not be financially feasible, particularly for organisations with significant structural pay disparities accumulated over years. A phased approach — closing the most severe gaps in the first cycle, with a commitment to address the remainder in subsequent cycles — is both practically necessary and legally defensible, provided the commitment is genuine and documented, and the full remediation is completed within a reasonable timeframe (typically two to three annual review cycles maximum).

No reduction of pay to achieve equity. Pay equity remediation must never involve reducing the pay of higher-earning employees to close gaps with lower-earning peers. This is both legally problematic in many jurisdictions and fundamentally contrary to the purpose of the exercise. Equity is achieved by raising underpaid employees to appropriate levels, not by bringing overpaid employees down.

Communication with affected employees. The approach to communicating pay equity adjustments to affected employees requires careful consideration. Some organisations inform employees that their salary adjustment is part of a broader pay equity effort; others incorporate the adjustment into the regular salary review without specific attribution. The right approach depends on the organisation's culture, the size of the adjustments and the broader context. What matters is that the adjustment is made, not how it is labelled in the communication.

Salary Band Configuration

Treegarden allows HR to define pay bands for each role and seniority level — the minimum, midpoint and maximum salary for employees in that category. Once bands are configured, the system flags any employees paid outside their band, both those below the minimum (representing underpayment relative to the defined standard) and those above the maximum (representing outliers that may require review). Pay bands are a fundamental tool for preventing future pay equity problems by constraining the range of compensation decisions within each role to a defined, consistent framework.

The legal landscape for pay equity and pay gap reporting is evolving rapidly in most jurisdictions, with requirements expanding in scope and frequency. HR leaders need to maintain current awareness of their specific obligations, since the penalty for non-compliance is increasing alongside the requirements themselves.

Equal pay legislation. Virtually every developed economy has equal pay legislation prohibiting differential pay for men and women doing the same or equivalent work. The specific requirements — what constitutes equivalent work, what defences are available, what the remedies are — vary significantly by jurisdiction. In the UK, the Equality Act 2010 provides one framework; the EU Pay Transparency Directive introduces new requirements across member states; the US Equal Pay Act of 1963 applies at the federal level with additional state-level provisions in many states. HR must operate according to the specific requirements of each jurisdiction in which the organisation employs people.

Mandatory pay gap reporting. An increasing number of jurisdictions now require employers above a defined size threshold to publicly report their gender pay gap (and, in some cases, ethnicity pay gap) data. The UK has required gender pay gap reporting for employers with 250 or more employees since 2017. The EU Pay Transparency Directive introduces pay reporting requirements across EU member states from 2026 onward. Other jurisdictions are implementing similar requirements. The specific metrics required, the reporting period, the publication deadline and the disclosure format vary by jurisdiction — HR must maintain current knowledge of the applicable requirements in each location.

Pay transparency requirements. Separate from pay gap reporting, pay transparency laws in several US states now require employers to include salary ranges in job postings. Colorado's Equal Pay for Equal Work Act, California's SB 1162 and New York's pay transparency law are prominent examples. These requirements create additional incentives to ensure internal pay equity before salary ranges become publicly visible — employees who see a posted range for a role similar to their own can now compare it directly to their current pay.

The trajectory of the legal environment is clearly toward greater transparency and more stringent requirements. Organisations that establish robust pay equity analysis processes now — rather than in response to a specific regulatory requirement — will be better positioned to comply with future requirements and to demonstrate to regulators, employees and the public that their compensation practices are genuinely equitable.

Compensation History Audit Trail

Every salary change recorded in Treegarden is logged with the date of the change, the previous and new salary, the reason for the change and the name of the approver who authorised it. This complete, timestamped compensation history creates the audit trail that a pay equity analysis requires: the ability to trace not just current pay but the sequence of decisions that produced it, revealing whether patterns in salary progression are consistent across demographic groups or whether certain groups have systematically received lower increases over time.

Frequently asked questions about pay equity analysis

What is pay equity analysis?

Pay equity analysis is a systematic review of an organisation's compensation data to identify salary differences between employees in comparable roles that cannot be explained by legitimate factors such as experience, performance, tenure or qualifications. It typically involves comparing pay across demographic groups — gender, ethnicity, age — as well as within job families and seniority levels. The goal is to identify unexplained disparities that may indicate discriminatory pay practices, whether intentional or inadvertent, and to take corrective action before those disparities create legal exposure or erode employee trust.

What is the difference between equal pay and pay equity?

Equal pay refers to paying employees the same amount for the same job — a legal requirement in most jurisdictions that prohibits paying one person less than another for identical work based on a protected characteristic. Pay equity is a broader concept: it examines whether pay is fair and proportionate across an organisation when accounting for legitimate differences in role, level, tenure and performance. An organisation can technically comply with equal pay law — paying men and women in the same role the same salary — while still having significant pay equity problems, such as women being systematically concentrated in lower-paid roles or levels.

How often should an organisation conduct a pay equity audit?

Most HR and legal experts recommend conducting a formal pay equity audit at least annually, ideally aligned with the annual compensation review cycle. This timing allows identified gaps to be addressed through the planned salary review process rather than requiring out-of-cycle adjustments. Organisations in jurisdictions with mandatory pay gap reporting requirements may need to conduct their analysis more frequently to ensure compliance with reporting deadlines. Significant organisational events — mergers, acquisitions, large-scale restructuring — should also trigger a pay equity review, as these events frequently introduce new compensation inconsistencies.

What should HR do when a pay equity audit identifies unexplained gaps?

When a pay equity audit identifies unexplained gaps, HR should first conduct individual case reviews for the affected employees to determine whether there are legitimate explanatory factors that were not captured in the initial analysis. If the gap cannot be explained by legitimate factors, HR should develop a phased remediation plan that closes the gap through salary adjustments — typically over one to two annual review cycles to manage the budget impact. The remediation should be prioritised by gap size, with the largest unexplained disparities addressed first. HR should also examine the compensation decision-making processes that produced the gaps to prevent recurrence.