Why mid-tier Transaction Services firms like BDO, RSM and Grant Thornton are a serious FDD career: the deals, the responsibility, pay and how to choose.
Ask a finance student where they want to start their career and you will hear the same four names. Ask a Transaction Services partner where the genuinely interesting deals get done, and where a junior analyst learns fastest, and you get a longer, more honest answer. Sitting just beneath the Big Four is a band of firms — BDO, RSM, Grant Thornton and their peers — that run substantial, fast-growing TS practices and hand real responsibility to their juniors far earlier than the largest firms tend to. Treating the mid-tier as a consolation prize is one of the more expensive mistakes a candidate can make. This article makes the opposite case: that the mid-tier is a serious, deliberate destination, and shows you how to talk about it convincingly in an interview.
The mid-tier sits between the Big Four (EY, PwC, KPMG, Deloitte) and the small independent boutiques. These are full-service accountancy and advisory firms with national reach and international affiliations, running dedicated Transaction Services or Corporate Finance teams that do financial due diligence alongside audit, tax and valuations. Beyond BDO, RSM and Grant Thornton, the category habitually includes names such as Forvis Mazars, Baker Tilly and Crowe, along with a tier of respected independents.
The label is easy to misread. A mid-tier TS practice in a major market is not a small operation — it can field dozens of dedicated deal professionals and close a high volume of transactions in a year. What distinguishes it is the type of deal and the type of client it serves, not a lack of scale or seriousness.
The single most useful reframing: the mid-tier is not "the Big Four but smaller". It is a different point on the market, with its own clients, its own deal rhythm and its own culture. Treat it as an alternative, not a fallback.
This is the heart of the matter. Mid-tier firms dominate a segment the Big Four often treat as secondary, clustering around a few recurring archetypes:
The discipline is the same you would learn anywhere — a quality of earnings review, a net debt build, a normalised working capital analysis and an equity bridge. What changes is the texture: messier source data, more direct contact with the people who built the business, and a real chance to spot red flags that a tidier corporate target would never surface.
There is a recurring lesson hiding in owner-managed deals. Founders frequently run personal costs through the business, blur the line between salary and dividend, and book one-off items as if they were recurring. Untangling that is exactly the EBITDA adjustment work at the heart of a QoE — and you get far more of it, far earlier, in the mid-tier than you would picking over an already-audited corporate carve-out. That messiness is not a bug; it is where the craft is learned.
The advantages cluster around three themes: responsibility, volume and culture.
Responsibility. On a mid-market deal the team is small. As a junior you are not analysing one slice of a P&L for three weeks while a partner you never meet presents the findings. You own workstreams, you join calls with management, and you see how the QoE and the report come together end to end. That visibility compounds quickly into competence.
Deal volume. Because mid-market deals are smaller and faster, you cycle through more of them in a year. Learning in TS is a function of repetitions — more deals means more management teams, more sectors, more diligence puzzles, and a faster instinct for what a genuine red flag looks like versus an accounting quirk. That instinct is the whole game, and reps buy it.
Culture and progression. Mid-tier teams tend to be flatter, with more direct feedback and a quicker route to manager and beyond. The hours, while still deal-driven, are frequently more humane than the largest practices at peak.
It would be dishonest to pretend the trade-offs do not exist. The Big Four retain clear advantages:
The honest framing is not "better or worse" but "different deals, different experience." For a fuller treatment of that spectrum, see Big Four vs. boutique; the mid-tier sits, in many respects, between those two poles.
| Dimension | Big Four | Mid-Tier | Boutique |
|---|---|---|---|
| Typical deal size | All sizes, incl. mega | Lower- and mid-market | Mid-market / niche |
| Core clients | Large PE, corporates | Founders, mid-market PE, lenders | Specialist mandates |
| Junior responsibility | Builds over time | High and early | High and early |
| Deal volume per analyst | Moderate | High | Variable |
| Brand recognition | Strongest | Strong in deal circles | Niche but respected |
I will not quote numbers — they vary by country, year and team, and any figure I invented would mislead you. Speak in ranges, structure and trajectory instead.
Broadly, base salaries at the mid-tier sit modestly below the Big Four at the same grade, with the gap widening at senior levels where brand and deal scale command a premium. But headline base is not the whole picture. Weigh the total package and the path: bonus structures, progression speed (a flatter firm can promote faster), overtime culture and hours, and the exits the experience unlocks. Because you tend to reach manager faster, the lifetime trajectory can be very attractive. The detail is laid out in the Transaction Services salary guide.
Do not choose a first TS role on starting salary alone. At this stage you are buying reps, responsibility and a trajectory. The compounding value of learning the craft quickly dwarfs a modest first-year base difference.
Work backwards from what you want, and weigh the firm on what actually shapes your two-year experience:
A worked illustration makes the trade-off concrete.
Worked example — two first-year analysts. Priya joins a Big Four team and spends her first year on two very large cross-border deals, owning a slice of the working capital analysis on each under close specialist supervision. Tom joins a mid-tier team and works on eleven mid-market deals — several OMB disposals, a couple of PE bolt-ons — drafting whole net debt and working capital sections and sitting in management meetings. Priya leaves the year with two blue-chip deals on her CV and deep exposure to scale and process. Tom leaves it having independently owned core workstreams across a dozen situations and seen far more variety of accounting behaviour. Neither path is "better" — but they produce genuinely different analysts, and knowing which one you want is the entire point of choosing deliberately.
Whatever you decide, tailor your application. A mid-tier firm wants to see that you understand and want mid-market work — not that you applied as a backup. Make that explicit in your CV.
Interviewers at mid-tier firms are alert to candidates who are only there because the Big Four said no. Expect a conversational, technically grounded process, and a variant of "Why us and not a Big Four firm?" Your task is to show you understand the mid-market and want it for the right reasons.
A strong answer sounds like this:
"I'm drawn to the mid-tier specifically because of the deal profile and the responsibility, not as a fallback. Your team works heavily with owner-managed businesses and PE-backed platforms, and that's exactly where I want to learn — the accounts are messier, the EBITDA adjustments are more judgemental, and the diligence is real detective work rather than reviewing a polished data room. On a leaner team I'd expect to own a workstream like net working capital or net debt far earlier, get direct contact with founders and partners, and see a higher volume of deals in my first two years. For someone who wants to build the core FDD skill set quickly, that volume and ownership is worth more to me than being one analyst among many on a single mega-deal. I also think your sector focus suits where I want to specialise."
Notice what that answer does: it names a real deal archetype, ties it to a specific skill, and frames the trade-off as a deliberate choice rather than a compromise. Prepare the same structure for follow-ups on culture, progression and exits. Ground everything in the mechanics of the work — see the interview preparation plan for how to build that foundation.
The mid-tier is not the understudy waiting for the Big Four to fall ill. It is a distinct and serious stage on which a great many strong Transaction Services careers are built — one that hands junior analysts real ownership, a high volume of varied deals, and the messy, founder-led situations where the craft is genuinely learned. The candidates who thrive there are not the ones who settled; they are the ones who understood what they were choosing and chose it on purpose. Do that, and the tier printed on your business card will matter far less than the reps in your hands.
The Transaction Services Interview Programme (€119.99, one-time) includes mid-market deal context and tailored answers so you can show a mid-tier interviewer you understand owner-managed and PE-backed work, not just the Big Four playbook. Enrol today.
Hundreds of candidates prepared their interviews with this programme. Those who landed the role have one thing in common: they worked the cases before walking into the room.
