Cumulative Equality Impact: When each decision isn’t enough

In 2011, the High Court found that Birmingham City Council had breached its equality duty when it cut adult social care funding, because it had not properly weighed the impact. A decade on, some councils run a named cumulative assessment routinely. Many still don’t. Here’s what the duty actually requires, and why assessing decisions one at a time isn’t enough.

What is cumulative equality impact, and why does it get missed?

A council setting its annual budget rarely makes one decision. It makes twenty or thirty: a change to a waste service here, a threshold for social care there, a fee introduced somewhere else. Each proposal typically gets its own equality impact assessment (EqIA), and each one, taken alone, can look entirely reasonable. What that process is not designed to catch is the resident who is touched by six of those twenty proposals at once, disabled, on a low income, and now facing a higher fee, a tighter eligibility threshold and a reduced service in the same financial year.

This is not a hypothetical concern. In R (W) v Birmingham City Council [2011], the High Court found that the council had failed to have due regard to its equality duty when it restricted adult social care funding to those with the most severe needs. The judge held that the council had not asked itself the right questions about the impact of the decision, including whether it had properly weighed that impact against the alternative of finding savings elsewhere in its budget.

What does the Public Sector Equality Duty actually require?

The Public Sector Equality Duty (PSED), set out in section 149 of the Equality Act 2010, requires public authorities to have due regard to the need to eliminate discrimination, advance equality of opportunity and foster good relations between people who share a protected characteristic and those who do not. A similar case the same year reached the same conclusion by a similar route. In R (JM and NT) v Isle of Wight Council [2011], the court found the council had not gathered the information it needed to properly assess the impact of restricting social care eligibility, again in the context of a wider savings programme.

Neither case turned on bad faith. Both councils had produced equality analysis for the decision in front of them. What both lacked was evidence that anyone had asked the wider question: given everything else the council is doing this year, what does this decision add up to for the people affected by more than one of them?

Where has this already become standard practice?

Some councils have already built an answer to that question into how they set a budget. Coventry City Council’s cumulative equality impact assessment for 2026/27 reviews all 21 of that year’s budget proposals together, alongside the individual assessment of each one, specifically to capture the combined effect on people sharing a protected characteristic. Other councils, including Kensington and Chelsea and Leicestershire, publish similar documents as a standard part of their budget papers. Practice is not universal, but where it exists, it is not experimental. It is a routine appendix to a budget report.

Central government has moved more slowly and more reluctantly. In 2010, the Fawcett Society sought judicial review of that year’s Emergency Budget, arguing the Treasury had failed to assess its disproportionate impact on women. Permission was refused, but the government conceded that budgets were not above equality law, and the Equality and Human Rights Commission’s 2014 research on cumulative impact assessment grew directly out of the pressure that followed, setting out a methodology for modelling the combined effect of tax, welfare and spending decisions on different groups. HM Treasury has since published some distributional analysis at fiscal events, though not to the same standard the methodology describes.

How should organisations build cumulative assessment into decision-making?

1. Treat cumulative assessment as a separate, later step, not a summary of the individual assessments. Complete the EqIA for each proposal first, then ask a second, distinct question: what does this look like once everything else changes at the same time?
2. Organise the cumulative picture around the people affected, not around which committee or budget line a decision sits in. A resident does not experience a council’s departmental structure: they experience the total change to their circumstances.
3. Run the cumulative assessment before the decision, not after it. An assessment published once a budget has already been set can describe the impact, but it can no longer change it, which defeats the purpose of the duty.
4. Publish the cumulative assessment alongside the individual ones, so councillors, residents and, if necessary, a court can see the whole picture that was actually in front of the decision-maker, not just its component parts.

A cumulative equality impact assessment does not ask an organisation to abandon decision-by-decision analysis. It asks for one further question, applied at the end: what does this amount to, for the people carrying more than one of these changes, once the year’s other decisions are added in?

How tCI Can Help

Advice and Guidance
A tCI faculty member will work alongside you to support the development of your decisions and engagement approach. We provide independent, constructive advice at critical stages, helping you strengthen stakeholder mapping, test communication strategies, and plan robust post-decision engagement. Our role is to act as a critical friend, offering practical recommendations grounded in consultation law and good practice that build confidence in your process.

Risk Assessment
Early identification of legal, political or reputational risks in your engagement approach. Using tCI’s five-risk methodology, we spot gaps before challenge arises, helping you strengthen stakeholder communication and demonstrate procedural fairness from the outset.

Executive Briefings
Concise updates for senior leaders on consultation law, engagement duties and post-decision risks. Helps boards and leadership teams make confident, defensible decisions when under pressure, with clear guidance on what good engagement looks like after difficult choices are made.

Whether you’re preparing for a high stakes service change or building defensible evidence for complex decisions, we can help.

Contact tCI: hello@consultationinstitute.org