Employment Tribunal Mediation in the UK: Likely Payouts for Employers

If a workplace dispute is heading towards an employment tribunal, you’ll almost certainly be asked to consider settling at mediation or during ACAS early conciliation. One of the first questions most employers ask is simple: what’s a likely payout?

There’s no one-size-fits-all figure. However, there is a sensible way to value risk so you can make confident decisions in mediation, protect cashflow and draw a line under the dispute.

In this guide, we’ll walk through how tribunals and mediators think about “value”, what usually makes a settlement go up or down, and a practical framework you can use to put numbers on the table. We’ll also cover how to structure the deal so it actually ends the dispute for good.

What Does Employment Tribunal Mediation Actually Cover?

Before you can estimate a likely payout, it helps to be clear on what you’re settling. Most UK employment disputes go through ACAS early conciliation first. If the case issues in the tribunal, you may be offered judicial mediation (particularly for discrimination or whistleblowing claims) or you can still negotiate a COT3 via ACAS at any point.

At mediation, the parties are usually trying to resolve all claims arising from the employment and its termination. In practice, that can include:

• Arrears of pay, holiday pay and notice pay (including statutory vs contractual notice)
• Unfair dismissal (basic award plus compensatory award)
• Discrimination, harassment or victimisation (including “injury to feelings”)
• Whistleblowing detriment/dismissal
• Unlawful deductions, breach of contract and bonus/commission disputes
• Uplifts for failure to follow the ACAS Code of Practice (up to 25%)
• Interest, and sometimes limited costs (while unusual in tribunals, costs can be awarded for unreasonable conduct)

Settlement terms almost always include mutual confidentiality, non‑disparagement, withdrawal of the claim and a full and final waiver. If you want peace of mind, make sure the documentation actually delivers that outcome-more on this below.

How Do Tribunals And ACAS Value Claims?

Tribunals don’t pick numbers out of thin air. There are well‑established “heads of loss” and caps which form the backbone of most valuations. Understanding these helps you sense‑check the numbers you hear in mediation.

Unfair Dismissal

Most ordinary unfair dismissal awards have two parts:

• Basic award – broadly similar to a statutory redundancy calculation (based on age, length of service and a statutory cap on a week’s pay). The statutory limits change each April.
• Compensatory award – designed to compensate for financial loss caused by the dismissal (e.g. lost earnings until the claimant finds a new job). This is subject to a statutory cap (the lower of a set monetary limit, updated annually, or 52 weeks’ gross pay). There’s no cap for certain automatic unfair dismissals (for example, some health and safety or whistleblowing cases).

Key adjustments include Polkey reductions (where a fair process would still have led to dismissal) and reductions for contributory fault. Claimants must also mitigate their loss by job‑hunting; failure to do so can reduce the compensatory award.

Discrimination (Equality Act 2010)

Compensation can cover financial loss and “injury to feelings”. Tribunals assess injury to feelings using guideline “bands” (often referred to as the Vento bands), revised periodically. The appropriate band depends on the seriousness and duration of the discrimination; serious or long‑running conduct pushes the award into the higher bands, with exceptionally serious cases exceeding the upper band.

Notice, Wages, Holiday And Contractual Claims

Notice pay, unpaid wages/holiday and most contractual sums are straightforward arithmetic (subject to any disputes about entitlement). Unlawful deductions can also attract interest.

ACAS Code Uplift

Where the ACAS Code of Practice on Disciplinary and Grievance Procedures should have applied and the employer unreasonably failed to comply, tribunals can increase awards by up to 25%. This is a common driver of negotiation, and a powerful reason to follow a fair process with proper investigation, meetings and appeal stages.

If you’re navigating conduct or capability concerns, it’s worth revisiting your process. For example, run fair workplace investigations and use Performance Improvement Plans appropriately to reduce future risk.

Estimating A Likely Payout: A Practical Framework For Employers

There’s uncertainty in every case, but you don’t need a crystal ball. You can build a realistic settlement range by working through five steps.

1) List The Heads Of Loss

Start by listing each potential head of loss relevant to the claim. Typical line items include:

• Contractual notice (or statutory minimum notice, if greater)
• Unpaid wages/holiday
• Unfair dismissal basic award
• Unfair dismissal compensatory award (projected lost earnings)
• Discrimination injury to feelings (appropriate Vento band)
• ACAS uplift (up to 25%), if the Code applies and there’s a risk of unreasonable non‑compliance
• Interest

Put a reasonable figure against each, recognising statutory caps and typical tribunal practice. If discrimination is alleged, choose a Vento band that reflects the facts and documentary evidence.

2) Adjust For Merits And Causation

Ask: what’s the chance the claimant actually wins on liability? If you think they have a 40% chance, multiply the relevant heads by 0.4 to create a “risk‑weighted” figure. This is common in mediation rooms and helps keep negotiations grounded.

Then adjust for causation. For example, if a fair process would likely have produced the same outcome, discount the unfair dismissal compensatory award to reflect a potential Polkey finding. If there’s strong evidence of contributory misconduct, apply a percentage reduction to reflect that risk.

3) Apply Mitigation And Time Horizons

Claimants must mitigate their loss. If the claimant found a new job after four months, limit the compensatory element accordingly. If they haven’t yet found work but there’s a healthy job market and relevant vacancies, project a reasonable job‑search period (often three to six months for non‑specialist roles) unless the claim evidences a longer loss period.

4) Factor In Process Costs, Management Time And Disruption

Your valuation isn’t only about what a tribunal might award; it’s also about what it costs you to keep fighting. Add a realistic estimate for:

• External legal spend to final hearing
• Internal management time (witnesses, HR, directors) diverted from the business
• Disruption, uncertainty and reputational risk

Even strong cases can justify a commercial settlement if the “all‑in” cost of defending exceeds the risk‑weighted payout.

5) Stress‑Test The Range

Run a best‑case and worst‑reasonable‑case scenario. In the worst‑case, assume the claimant wins on the main heads and the tribunal applies an ACAS uplift. In the best‑case, assume liability fails or the remedy is significantly reduced for Polkey, mitigation and contributory conduct. Your settlement “zone” usually sits between these numbers, nudged by appetite for risk and the value of finality.

As you model the range, keep an eye on where process weaknesses could inflate the award. Common examples include inadequate investigation before dismissing for gross misconduct or skipping the appeal step. It’s also worth revisiting whether the dismissal handling aligned with your Employment Contract and staff handbook obligations.

Factors That Push Settlement Up Or Down

Two cases with the same headline claim can have very different settlement values. Here are the levers that typically move numbers in mediation.

What Pushes Payouts Up

• Process gaps – poor or absent investigations, denying a companion, no appeal, or clear ACAS Code breaches
• High earnings/long service – driving a larger compensatory award in unfair dismissal, subject to caps
• Credible discrimination or whistleblowing facts – particularly where contemporaneous emails or messages support the allegations
• Medical evidence – tying prolonged loss, stress or personal injury to the employer’s acts or omissions
• Business impact of publicity – if a public hearing risks brand damage or employee relations concerns

What Pushes Payouts Down

• Clear fair‑reason evidence – strong performance or conduct evidence, well‑documented warnings and support
• Robust process – documented compliance with the ACAS Code, which removes the uplift risk
• Contributory misconduct – genuine, evidenced behaviour that could reduce awards
• Mitigation – evidence the claimant quickly found a comparable role (or reasonably should have)
• Polkey – where dismissal was procedurally unfair but outcome would probably have been the same

Ahead of mediation, it often pays to conduct a focused file review. Plug any process gaps you can still fix (for example, concluding an outstanding appeal) and gather your key documents into a clean chronology. This tightens your position and tends to lower settlement expectations.

Mediation Strategy And Clauses To Get Right

Getting the number right is only half the job. The other half is locking down terms that truly end the dispute and protect your business.

COT3 vs Settlement Agreement

• COT3 (via ACAS) – a concise agreement prepared by an ACAS conciliator. It settles the claims in the tribunal and can also settle wider claims if drafted properly. It’s quick and enforceable without a separate lawyer’s certificate.
• Settlement agreement – a fuller contract between you and the employee or ex‑employee, often used when there’s no issued claim or where you want additional protections. The individual must take independent legal advice for it to be binding, and you typically make a small contribution to their legal fees.

Whichever route you choose, make sure the document actually covers the points you care about. It’s common (and sensible) to include:

• Full and final settlement – waiving specified statutory and common law claims, with carve‑outs where required by law
• Confidentiality and non‑disparagement – mutual where appropriate, with clear exceptions (e.g. legal, regulatory and medical disclosures)
• Reference wording – an agreed short reference or confirmation of employment dates and role
• Return/deletion of company property and data – especially important for BYOD or remote‑first teams
• Repayment/indemnity – for tax if HMRC later challenges the treatment (standard in settlement agreements)
• No admission of liability – to protect your position

If you’re settling wider disputes (e.g. bonus or commission issues), consider whether any parallel deed of settlement terms or payment schedules are needed to manage cashflow.

Tax Treatment Matters

UK termination payments are taxed under specific rules. As a high‑level guide (and always subject to advice):

• Outstanding earnings (wages, holiday pay, bonuses, commission) and notice pay are taxable and subject to NICs
• Some ex‑gratia termination sums may be paid without tax up to a statutory threshold, with the excess taxed
• Post‑Employment Notice Pay (PENP) rules can deem part of a payment as taxable notice
• “Injury to feelings” awards arising from discrimination are not automatically tax‑free; the position depends on the context

Tax treatment should be built into your negotiation plan and the drafting. A clean schedule breaking down each element avoids confusion later.

Reducing Your Exposure Before A Claim Arises

The cheapest claim is the one that never lands. A few operational improvements dramatically reduce the “likely payout” in future disputes:

• Clear contracts and policies – up‑to‑date Employment Contract terms, a practical staff handbook and consistent application
• Fair processes – follow the ACAS Code, run proportionate workplace investigations and issue final written warnings where appropriate
• Performance management – use structured PIPs to evidence support and fairness before moving to dismissal
• Consistency and documentation – consistent treatment avoids discrimination risk and good notes win credibility at tribunal
• Know your hotspots – understand common reasons employers lose employment tribunals and build them into manager training

If you’re already in a dispute, sense‑check whether any live process steps can be improved now (for example, completing a fair appeal). That can move the needle on your mediation “likely payout” and often pays for itself quickly.

Key Takeaways

• There’s no universal “likely payout” for employment tribunal mediation-but you can build a robust settlement range by listing heads of loss, risk‑weighting for merits and adjusting for mitigation, Polkey and contributory conduct.
• Unfair dismissal awards are capped (subject to limited exceptions) and split into basic and compensatory elements; discrimination cases add injury to feelings within guideline bands.
• Process quality is a major price driver. Solid investigations, ACAS Code compliance and consistent documentation reduce both liability risk and uplifts.
• Settlement isn’t just the number-lock in confidentiality, waiver of claims, reference wording and tax‑clean schedules (via COT3 or a settlement agreement) so the dispute truly ends.
• Prevention beats cure. Strong Employment Contract terms, fair workplace investigations and well‑run PIPs lower your future settlement exposure.
• If numbers feel uncertain, reality‑check your model against legal spend, management time and reputational risk-commercial pragmatism is part of a sensible mediation strategy.

If you’d like help valuing risk, preparing a mediation strategy or drafting the settlement documentation, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.