---
title: 'Senior Manager- M&A Tax at Unity Advisory'
canonical: 'https://feeny.ai/job/senior-manager-m-a-tax-unity-advisory-london-9cf3m4jem5cx'
type: 'job'
last_seen: '2026-09-04'
---

# Senior Manager- M&A Tax at Unity Advisory

- **Company:** Unity Advisory
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-08-11
- **Last confirmed live:** 2026-09-04
- **Apply:** https://jobs.ashbyhq.com/unity-advisory/490d511d-c084-4c13-820f-2ca08f7a90e7

## Job description

## About Unity Advisory

Unity Advisory is a pure-play, experience-led CFO advisory firm providing integrated finance, commercial, tax and deals support. We are free from audit conflicts and AI-enabled by design, combining deep technical expertise with automation, analytics and AI embedded into the delivery of every engagement. We are building an alternative to traditional advisory firms, focused on clarity over complexity, outcomes over hours, and practical advice delivered at pace for CFOs making high-consequence decisions.

## The Role

We're looking for a Senior Manager to join our M&A and transactional tax team. You'll take day-to-day ownership of engagement delivery, advising clients on UK and international deal structuring, tax due diligence, SPA tax input, and post-deal integration.

You'll bring solid M&A or transactional tax experience from a Big 4, top-tier advisory firm, or law firm, and be comfortable running workstreams end-to-end while working closely with our Directors and Partners. You'll advise private equity, corporate, and family office clients directly, and play a key role in shaping how AI and automation are used across our tax delivery. This is a hybrid role based in our Mayfair office.

## What You'll Do

- Lead the day-to-day delivery of M&A and transactional tax engagements across buy-side and sell-side deals.
- Advise clients on UK and international deal structuring, tax due diligence, and SPA tax input.
- Support post-deal integration workstreams, including tax structuring and reporting considerations.
- Work directly with private equity, corporate, and family office clients to deliver commercially focused tax advice across the transaction lifecycle.
- Review and quality-check technical outputs from junior team members ahead of Director or Partner sign-off.
- Collaborate with Unity's in-house AI team to help build and refine delivery tools for the transactions tax practice.
- Support business development activity: proposals, pitches, and building client relationships.
- Coach and develop junior team members, contributing to the growth of the transactions tax practice.

## What You Bring

- Significant experience in M&A or transactional tax from a Big 4, top-tier advisory firm, or law firm.
- Hands-on experience delivering buy-side and sell-side tax due diligence and deal structuring advice.
- Strong technical grounding in UK corporate tax as it applies to transactions.
- A track record of managing engagement delivery and coordinating with legal counsel and other deal advisors.
- Clear, confident communicator, comfortable engaging directly with client stakeholders.
- Qualified tax professional (CTA, ACA, or equivalent).

## Nice to Have

- Exposure to cross-border or international transactions.
- Experience advising private equity or family office clients.
- Familiarity with tax technology or AI-enabled delivery tools.
- Sector experience in areas like TMT, Consumer, or Business Services.

Working at Unity Advisory

At Unity Advisory, you'll be at the heart of a growing transactions tax practice. We offer:

- A truly hybrid and flexible working model.
- The chance to help shape a modern, AI-enabled M&A tax offering.
- Direct exposure to senior clients, dealmakers and investors from day one.
- A flat, collaborative team where ideas move quickly and impact is real.

Additional Information

At Unity Advisory, we are committed to providing an inclusive and accessible recruitment process. In line with the Equality Act 2010, we will accommodate any suitable candidate requiring assistance to attend or conduct an interview. If you need any adjustments or support, please let us know when either scheduling your interview or in your application cover letter. We are dedicated to ensuring that everyone has an equal opportunity to succeed and are here to support you throughout the process.

PLEASE BE ADVISED THAT WE DO NOT ACCEPT ANY UNSOLICITED CVs FROM THIRD-PARTY AGENCIES.

## About Unity Advisory

## Company Overview
- **One-liner**: Unity Advisory is a professional services firm built for the Office of the CFO, combining big‑firm expertise with AI‑enabled delivery to help CFOs and leadership teams make sharper decisions and move faster.
- **Entity Type**: Private (backed by Warburg Pincus)
- **Headquarters**: London, United Kingdom (with offices in Malaysia and India)
- **Founded**: 2025 (launched with Warburg Pincus backing)
- **Founders**: Marissa Thomas (CEO) and David Tapnack (Co‑founder, departed Jan 2026)

## Core Business
- **Primary Industry**: Professional Services (Finance, Tax, Deals & Advisory)
- **Target Customers**: CFOs and leadership teams of mid‑ to upper‑mid‑market businesses, including private equity‑backed companies; B2B / enterprise
- **Mission**: “Help CFOs and leadership teams make sharper decisions, and move faster with confidence – bringing clarity, challenge, and real‑world experience when it counts.”

## Products & Services
- **Tax Services**: Covering R&D Tax, VAT & Indirect Tax, Transfer Pricing, Corporate Tax, Employment Tax, Capital Allowances, Tax Managed Services, and Tax Compliance – all delivered with AI‑driven efficiency.
- **Deals & Value Capture**: Deals Analytics, Deals Tax & Structuring, Due Diligence, Carve‑out, Integration & Synergy Delivery, Deal Readiness Assessment, and Equity Story Craft.
- **Finance & Commercial Services**: Accounting Advisory & Technical Reporting, Financial Control, Performance Acceleration & Cost Optimisation, Process Optimisation, Data & Cloud Architecture, Risk & Control Frameworks, and Organisation Design.
- **Advisory & Transformation**: Rapid Function Diagnostics, Enterprise Architecture & Technology, and CFO‑focused strategic advice.

All services are delivered via a proprietary AI workflow platform that accelerates insights while keeping human expertise central.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Key Metric**: Backed by a long‑term investment from Warburg Pincus (amount not publicly disclosed)
- **Notable Investors / Partners**: Warburg Pincus (sole institutional backer); strong relationships with corporate, private equity and sovereign clients; non‑exec chair is Steve Varley (former EY UK Chair & Global Vice‑Chair Sustainability).
- **Growth Signals**: Headcount surged from ~1 to 76 employees (+4700% YoY) within the first year; presence across UK, Malaysia, and India; actively hiring for 16 open positions; monthly headcount growth of +2.1%.

## Competitive Advantages
- **Experience + Agility**: Leadership includes former Managing Partner of PwC UK and partners from EY, Deloitte, KPMG, yet operates with startup speed and flat hierarchies.
- **AI Built‑In, Not Bolted‑On**: Proprietary AI workflows and cloud‑first architecture are embedded into every offering, delivering faster, smarter outcomes without replacing human judgment.
- **No Conflicts of Interest**: Free from the traditional conflicts that can arise in large firms, allowing truly client‑first advice.
- **Senior‑Led, Lean Teams**: Work is delivered by experienced partners and senior managers, not junior staff; high autonomy and true ownership for client outcomes.

## Strategic Focus
- **Scaling Rapidly**: Driven by strong client demand, Unity Advisory is expanding its team and service lines while maintaining a partner‑led, high‑performance culture.
- **Continuous Innovation**: Investing in data, cloud, and AI capabilities to keep delivery ahead of traditional consulting models.
- **Geographic Reach**: Growing its UK base while leveraging nearshore talent in Malaysia and India to serve global clients.

## Why Work Here
- **Culture**: Described as “Straightforward, Intentionally Commercial, Open, Experimental, and Team‑First.” The firm is designed for high performers who value impact over politics.
- **Work Style**: Flat teams with high autonomy; every employee owns delivery for client outcomes. Remote/hybrid policy not specified, but roles appear to be UK‑based with some global presence.
- **Perks & Environment**: Modern tools, strong leadership support, and the chance to shape a fast‑growing firm from an early stage. Emphasis on “the right tools, culture, capital, and leadership to enable people to do their best work.”
- **Engineering Culture**: Technical roles (Data Engineer, Solution Architect) are embedded in a firm that treats AI as a core capability, offering engineers exposure to real‑world finance transformation.

## Sources
1. [unity-advisory.com](https://unity-advisory.com/)
2. [jobs.ashbyhq.com/unity-advisory](https://jobs.ashbyhq.com/unity-advisory)
3. [linkedin.com/company/unity-advisory](https://www.linkedin.com/company/unity-advisory)
4. [unity-advisory.com/careers](https://unity-advisory.com/careers)
5. [unity-advisory.com/what-we-do](https://unity-advisory.com/what-we-do)

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