How private equity firms make money

Why this is a core FSG topic, not background reading

You can get through plenty of M&A or leveraged finance interviews without ever being asked how the private equity business model itself works, because the client is treated as a fixed feature of the deal rather than something you need to understand from the inside. FSG interviews are different. Because your entire job is covering these firms, interviewers expect you to understand not just what a sponsor does, but how it actually earns money, what its incentives are, and why those incentives shape the deals it does. This article covers the fund-level mechanics: management fees, carried interest, the general partner and limited partner structure, and how capital actually moves in and out of a fund over its life.

The two revenue streams every fund has

A private equity firm's economics run on two separate revenue streams, and interviewers expect you to be able to name both without conflating them.

Management fees are a fixed annual fee, typically calculated as a percentage of the capital investors have committed to the fund (or, later in a fund's life, sometimes based on invested capital rather than total committed capital). This fee is paid regardless of how the fund's investments perform, and it covers the firm's operating costs: salaries, office space, deal expenses, and everything else needed to run the business. Because it's steady and predictable, management fee income is what keeps a private equity firm's lights on between deals and across market cycles when deal activity or exits slow down.

Carried interest, usually just called "carry," is the firm's share of the fund's investment profits, typically discussed as a percentage of gains above a minimum required return for investors. This is where the real money in private equity is made over a career, but it's also risk-bearing: if a fund's investments don't perform well enough to clear the minimum return threshold, the firm doesn't earn carry on that fund at all, no matter how many years of management fees it collected along the way.

GPs and LPs: who actually owns what

A private equity fund is a legal partnership with two kinds of participants. The general partner (GP) is the private equity firm itself, the entity that raises the fund, makes all the investment decisions, and manages the portfolio companies. The limited partners (LPs) are the investors who commit capital to the fund, typically pension funds, endowments, insurance companies, sovereign wealth funds, and increasingly wealthy individuals through various access vehicles. LPs provide essentially all of the fund's capital but have no say in individual investment decisions; that authority sits entirely with the GP. In exchange for giving up that control, LPs get the fee and carry structure above spelled out clearly in advance, along with reporting rights and, usually, a seat on a fund advisory committee that weighs in on conflicts of interest and other structural matters, though not on individual deals.

This structure is worth understanding cold, because it explains a lot of sponsor behavior an FSG banker needs to read correctly. A GP's own capital is typically a small fraction of a fund's total size, so most of the money at risk on any given deal belongs to the LPs, not the sponsor itself, even though the sponsor is the one negotiating the deal and making every decision. That asymmetry, real decision-making power paired with limited direct capital at risk, is exactly why the carry structure exists: it's meant to align the GP's incentives with LP outcomes by giving the GP real upside tied to actual investment performance rather than just fee collection.

How capital actually moves: commitments, calls, and distributions

An LP doesn't hand over its full commitment to a fund on day one. Instead, LPs commit to provide up to a certain amount of capital over the fund's life, and the GP calls that capital in tranches, called capital calls, as it actually needs money to fund specific investments. This matters for a coverage banker because it explains the concept of "dry powder": a fund with $2 billion of total commitments that has only called $800 million so far still has $1.2 billion of capacity to deploy, even though none of that uncalled capital is sitting in a bank account waiting. Dry powder is committed but uncalled capital, and it's one of the first things an FSG banker tracks about any fund it covers, because it's a direct signal of how much buying power a sponsor has left.

On the other end, when the fund sells a portfolio company or otherwise realizes a return, proceeds flow back to LPs (and to the GP for its carry, once earned) through a distribution waterfall, a defined order of priority for how money gets paid out. A simplified version of a typical waterfall runs: LPs get their invested capital back first, then LPs receive a minimum preferred return (commonly discussed in industry material as a return in the high single digits, though exact figures are negotiated fund by fund and not something to state as a fixed rule), then the GP often receives a disproportionate share of the next tranche of profit (a "catch-up") until the overall split between LPs and the GP reaches the agreed carry ratio, and finally remaining profits split according to that ratio, commonly discussed as roughly 80% to LPs and 20% to the GP, going forward. The exact numbers vary by fund and by negotiating leverage, and you should never present them as universal facts in an interview, but understanding the ordering, capital back first, then a preferred return, then carry, is what interviewers are actually testing.

Fund life is finite, and that shapes everything

Most private equity funds are structured as closed-end vehicles with a defined life, commonly discussed as roughly ten years with the possibility of extensions, split into an investment period (the first several years, when the fund is actively buying) and a harvesting period (the later years, when the focus shifts to managing and exiting existing investments). A firm typically raises a new fund every few years, so at any given time a firm may be simultaneously investing out of one fund, monitoring a slightly older fund's existing portfolio, and preparing to exit assets in its oldest fund to return capital to LPs ahead of raising the next one.

This finite clock is the single most useful piece of context an FSG banker can carry into a coverage relationship. A fund early in its life, with a large uncalled commitment and years left in its investment period, behaves differently from a fund in year eight approaching the end of its term, sitting on assets it increasingly needs to sell regardless of whether market conditions are ideal. Reading where a given fund sits on that clock, and what pressure that creates, is a real part of the job, and it connects directly to how sponsor coverage works and to why a fund might choose one exit route over another, covered in sponsor exit routes.

Why this connects to deal-level returns thinking

The fee-and-carry model explains why sponsors care so intensely about the specific return metrics, IRR and MOIC, that show up in every LBO conversation. A GP's own economics, especially its long-run reputation and ability to raise future funds, depend on delivering strong realized returns to LPs across the fund's life, not just on closing deals. That's why sponsors underwrite every acquisition against a specific return hurdle rather than simply asking whether a deal looks directionally attractive, and why the debt capacity and exit assumptions behind any deal matter as much as the target's operating quality. The mechanics of that return math, and how a sponsor works backward from a target IRR to a maximum purchase price, are covered in full in LBO returns: IRR, MOIC, and the three levers of value creation.

How this shows up in interviews

Interviewers use this material to separate candidates who read a one-line definition of "private equity" from candidates who understand the business model well enough to reason about sponsor behavior. A common test is asking you to explain why a fund would rather hold onto a strong-performing portfolio company for longer, or conversely why a fund might sell earlier than seems optimal from a pure business standpoint; the honest answer usually traces back to where the fund sits in its own life cycle and its need to return capital to LPs, not to anything about the target company's performance. Another common angle asks you to explain the difference between management fees and carry in your own words and why a firm would care about growing assets under management even when carry, not fees, is the bigger long-run prize; the answer is that fee income funds the firm's survival between successful exits, while carry is what actually builds wealth for the firm's partners over a career.

Practice question

Explain how a private equity firm actually makes money, and why that structure matters for how it behaves.

A private equity firm earns money two ways. It collects a management fee, usually a percentage of the capital investors have committed to its fund, paid every year regardless of performance, which covers the firm's operating costs. And it earns carried interest, a share of the fund's investment profits once returns clear a minimum threshold for its investors, which is where the real long-run wealth in the business gets built, but only if the fund actually performs. The firm itself, called the general partner, makes all the investment decisions, while the capital comes overwhelmingly from limited partners like pension funds and endowments, who have no say in individual deals but negotiated the fee and carry terms upfront. That structure matters because it explains sponsor behavior that otherwise looks confusing: a fund nearing the end of its contractual life feels real pressure to exit its remaining holdings and return capital to LPs, even if a given company could arguably keep growing under continued ownership, because the firm's ability to raise its next fund depends on showing LPs a track record of returning capital, not on holding assets indefinitely. Understanding that the fee-and-carry structure and the fund's finite life both push toward eventually selling is part of why FSG coverage bankers pay close attention to where each fund they cover sits in its own life cycle.

What the interviewer is listening for: whether you can explain fees and carry without conflating them, whether you understand the GP-LP relationship correctly, and whether you can connect fund structure to real sponsor behavior rather than reciting definitions in isolation.