Author: Gert-Tom Draisma / www.TristanFinance.com

First published: 24th of September 2026

Latest update: 28th of September 2026

Private equity can appear complicated because the industry has developed its own terminology, legal structures, performance measures and conventions. But the underlying economic model is relatively straightforward.

Investors provide capital to specialist investment managers. Those managers use the capital, usually together with debt, to acquire interests in privately held businesses. Unlike an investor purchasing shares on a stock exchange, the private equity investor normally becomes an active owner. It may change management, strategy, financing, operations or the structure of the business. After several years, the investment is sold and the proceeds are returned to the investors.

If the investments are successful, the investment manager generally participates in the resulting profits through carried interest.

That simple description, however, conceals several characteristics that make private equity fundamentally different from conventional public-market investing.

Understanding those characteristics is essential to understanding carried interest.

This chapter provides the condensed version.

Readers who want to understand the individual subjects in greater depth can follow the references to Parts I–XI of this introduction.

1. Private equity in one sentence

At its core, private equity can be described as:

Long-term ownership of relatively illiquid businesses, using specialist investment judgement, active ownership and often leverage to create value before ultimately realising that value through an exit.

Almost everything that makes private equity distinctive follows from this sentence.

The assets are private.

The investments are illiquid.

Ownership is generally long-term.

The investor is often active rather than passive.

Transactions require substantial human capital and due diligence.

Debt is frequently an important component of the capital structure.

And the investment ultimately has to be realised before its value can be returned to investors in cash.

These characteristics also explain why private equity funds have their distinctive structure, why they experience a J-curve, why conventional accounting measures tell us relatively little about fund performance, and ultimately why carried interest has developed as the principal performance incentive for the investment manager.

A very short history of private equity

2. Private equity existed before the term existed

Investing private capital in businesses is hardly a modern invention.

Merchants, wealthy families, industrialists and financiers have financed commercial ventures for centuries. What changed during the twentieth century was the institutionalisation of that activity.

Specialist organisations emerged whose business was not principally to operate companies themselves, but to:

• raise capital;
• identify investment opportunities;
• acquire interests in businesses;
• improve or develop those businesses;
• and ultimately realise the investments.

This gradually developed into the modern private equity industry.

The full history is discussed in Part I — Origins and History.

3. From venture capital to leveraged buyouts

The post-war period saw the development of organised venture-capital investing, particularly in the United States.

Over time another model became increasingly important: acquiring established businesses using a combination of equity and substantial amounts of debt.

This developed into the leveraged buyout, or LBO.

The 1980s became the era in which leveraged buyouts entered public consciousness.

Few transactions symbolise that period better than the battle for RJR Nabisco, ultimately acquired by KKR in 1989.

The transaction became famous through Barbarians at the Gate and came to represent both the ambition and controversy surrounding the buyout industry of the period.

But modern private equity has evolved considerably since then.

What began as a relatively small and entrepreneurial industry has developed into a major institutional asset class encompassing buyouts, growth capital, venture capital, secondaries and numerous specialist strategies.

Pension funds, insurance companies, sovereign wealth funds, endowments, family offices and other institutional investors now routinely allocate capital to private markets.

The essential economic relationship, however, remains remarkably recognisable:

Investors provide capital to specialist managers who invest it on their behalf.

That relationship is the starting point for understanding the modern private equity fund.

What makes private equity different?

4. There is no continuously quoted market price

Suppose an investor owns shares in a large publicly traded company.

At almost any moment during market hours, the investor can observe a market price.

If the investor wants to sell, there is an organised market containing potential buyers.

The transaction can often be completed within seconds.

Private equity works very differently.

A privately owned company does not normally have:

• a continuously quoted market price;
• an order book;
• thousands of potential buyers ready to transact immediately;
• or guaranteed daily liquidity.

If a private equity fund wants to sell a company, it usually has to create a transaction.

That may require months of preparation.

This difference is explored in detail in Part II — What Makes Private Equity Different and Part IV — Illiquidity and Transaction Friction.

5. Illiquidity does not mean that an asset cannot be sold

This distinction is important.

Private equity investments can certainly be sold.

Indeed, successful exits are fundamental to the private equity model.

Illiquidity means something more precise:

There is no continuous, guaranteed, low-cost mechanism through which the asset can immediately be converted into cash at an observable market price.

A sale requires a process.

Potential buyers must be identified.

Information must be prepared.

Management presentations may be required.

Due diligence must be performed.

Financing may have to be arranged.

Price and contractual terms must be negotiated.

Regulatory approvals may be necessary.

The eventual buyer may itself be another private equity fund.

Illiquidity therefore creates friction.

Transaction friction

6. Buying a company is itself an investment

When an investor buys a publicly traded share, the transaction cost is generally tiny relative to the investment.

Buying a private company is different.

Before acquiring a business, a private equity manager may deploy substantial resources into:

• commercial due diligence;
• financial due diligence;
• legal due diligence;
• tax analysis;
• operational due diligence;
• environmental analysis;
• technology analysis;
• management assessment;
• financing;
• valuation;
• and negotiation.

Investment professionals may spend months analysing a transaction that is ultimately never completed.

Those costs are part of private equity's economic reality.

7. Capital availability does not imply asset availability

This is another important difference.

A fund may have €2 billion available for investment.

That does not mean €2 billion of attractive companies can simply be purchased.

The GP must find businesses whose:

• owners are willing to sell;
• valuation is acceptable;
• risk is understood;
• financing is available;
• strategic potential is attractive;
• and expected return justifies the investment.

This means that investment selection itself is a scarce capability.

The private equity manager is not merely allocating capital among securities already available in a market.

It is sourcing and constructing transactions.

8. A bad investment is difficult to reverse

This transaction friction also works in the opposite direction.

Suppose a public-market investor concludes that an investment thesis was wrong.

The shares can usually be sold.

The investor takes the loss and reallocates the remaining capital.

A private equity fund may not have that option.

There may be no buyer at an acceptable price.

The company may have substantial debt.

Management may need replacing.

Operational problems may require years to resolve.

Additional capital may be required.

A mistake made at acquisition can therefore remain with the fund for a long time.

This is one reason private equity firms invest so heavily in people, judgement and due diligence before making an investment.

The private equity fund

9. Why a fund structure is needed

The private equity investment manager generally does not finance acquisitions entirely with its own money.

Instead, it raises a fund from outside investors.

These investors are generally known as Limited Partners, or LPs.

The investment manager is generally referred to as the General Partner, or GP, although the precise legal structure can vary.

The fund structure is discussed comprehensively in Part III — The Private Equity Fund.

10. Commitment is not the same as investment

Suppose an LP commits:

€100 million

to a private equity fund.

It does not necessarily transfer €100 million to the fund immediately.

Instead, the LP makes a legally binding commitment.

The GP calls that capital as it is needed.

For example:

This is fundamentally different from purchasing €100 million of publicly traded shares on Day 1.

It also has enormous consequences for performance measurement.

11. The GP controls the investment process

The LP commits capital but does not normally decide which individual companies the fund acquires.

That responsibility is delegated to the GP.

The GP:

• sources transactions;
• evaluates opportunities;
• conducts due diligence;
• negotiates acquisitions;
• arranges financing;
• monitors investments;
• participates in governance;
• supports value creation;
• and ultimately decides when and how investments should be realised.

The LP is therefore investing not only in a portfolio.

It is investing in the ability of the GP to construct and manage that portfolio over time.

The J-curve

12. Private equity economics unfold through time

This leads to one of the most important concepts in private equity: the J-curve.

It is discussed in detail in Part V — The J-Curve.

In the early years of a fund:

• capital is being called;
• investments are being acquired;
• management fees are being paid;
• transaction costs are incurred;
• some attempted transactions fail;
• and relatively few investments have yet been sold.

Cash therefore initially moves predominantly from the LP into the fund.

Only later do successful investments begin generating substantial distributions.

13. The basic shape

A simplified fund might look like this:

The precise shape differs enormously between funds.

The important point is the sequence.

Investment comes before realisation.

14. The J-curve explains much more than cash flow

The J-curve is not merely an interesting graph.

It explains why private equity has to be analysed differently.

A young fund may appear unprofitable precisely because it is doing what it was created to do:

investing.

Its strongest companies may still be in the early stages of transformation.

Its weakest investments may already have been written down.

Its management fees and transaction costs have already occurred.

Its successful exits may still be years away.

Looking at one year's P&L therefore tells us remarkably little about whether the fund will ultimately be successful.

This is a central insight for everything that follows.

How private equity creates value

15. Buying a company cheaply is only the beginning

Private equity returns are sometimes explained almost entirely through leverage.

That is incomplete.

A useful starting point is:

Enterprise Value = EBITDA × Valuation Multiple

while:

Equity Value = Enterprise Value − Net Debt

These simple relationships already reveal several potential sources of equity return.

They are explored in detail in Part VI — How Value Is Created.

16. Revenue growth

The portfolio company may increase revenue through:

• market growth;
• market-share gains;
• pricing;
• new products;
• geographic expansion;
• customer retention;
• cross-selling;
• or acquisitions.

If revenue grows while margins are maintained, EBITDA generally increases.

That can increase enterprise value.

17. Margin improvement

Revenue growth is not the only route.

A company may improve profitability through:

• procurement;
• pricing;
• automation;
• organisational rationalisation;
• supply-chain improvement;
• product mix;
• operating efficiency;
• and better cost control.

Suppose revenue is:

€500 million

and EBITDA is:

€50 million.

The EBITDA margin is:

10%.

If revenue remains €500 million but EBITDA margin improves to 15%, EBITDA becomes:

€75 million.

At the same valuation multiple, the business has become substantially more valuable.

18. Professionalisation

Many private equity investments involve businesses that have substantial potential but lack institutional infrastructure.

The GP may help introduce:

• stronger management;
• professional financial reporting;
• budgeting;
• KPI systems;
• governance;
• strategic planning;
• incentive structures;
• and more disciplined capital allocation.

The objective is not necessarily to make the organisation more bureaucratic.

It is to make it more capable of operating at a larger scale.

19. Buy-and-build

A portfolio company can also acquire other businesses.

This may create value through:

• scale;
• synergies;
• geographic expansion;
• broader products;
• stronger purchasing power;
• and consolidation of fragmented markets.

Sometimes smaller businesses can be acquired at lower valuation multiples than the larger combined group ultimately commands.

But buy-and-build is not automatic value creation.

Poor acquisitions can destroy value just as effectively as poor organic investments.

Leverage

20. Debt changes the economics of the equity

Private equity buyouts frequently use debt.

The mechanics are explored in Part VII — Leverage and Capital Structure.

Consider a company worth:

€1 billion.

If it is acquired entirely with equity, the investor contributes:

€1 billion.

If instead the acquisition uses:

€600 million debt

and:

€400 million equity,

the investor controls the same €1 billion enterprise with €400 million of equity.

21. Why leverage amplifies returns

Suppose enterprise value later increases to:

€1.5 billion.

If debt remains €600 million:

Equity Value = €1.5bn − €600m = €900m

The equity investment increased from:

€400m → €900m

or:

2.25×

even though enterprise value increased only:

1.5×.

Leverage amplified the equity return.

22. Debt reduction can create additional equity value

Suppose the business generates cash during ownership and debt falls from:

€600 million

to:

€300 million.

At an exit enterprise value of €1.5 billion:

Equity Value = €1.5bn − €300m = €1.2bn

The original €400 million equity investment has become:

€1.2 billion

or:

3.0×.

This illustrates why cash generation and debt repayment can be powerful contributors to private equity returns.

23. But leverage works in both directions

Now suppose enterprise value falls from:

€1 billion

to:

€800 million.

With €600 million of debt:

Equity Value = €800m − €600m = €200m.

Enterprise value declined by:

20%.

Equity value declined by:

50%.

Leverage amplifies losses just as it amplifies gains.

It does not make a bad company good.

It makes the equity claim more sensitive to what happens to the underlying business.

Putting value creation together

24. A simple private equity return bridge

Imagine a company acquired with:

• EBITDA: €100m
• Entry multiple: 10×
• Enterprise value: €1bn
• Debt: €600m
• Equity: €400m

Five years later:

• EBITDA: €140m
• Exit multiple: 10×
• Enterprise value: €1.4bn
• Debt: €300m
• Equity value: €1.1bn

The original:

€400m

has become:

€1.1bn.

That is a:

2.75× multiple of invested capital.

The €700 million increase in equity value can be explained broadly by:

€400m enterprise-value growth

plus:

€300m debt reduction.

The example illustrates why it is useful to distinguish operational value creation from financial amplification.

As established in Parts VI and VII:

Operational value creation changes the economics of the underlying business.

Leverage changes the economics of the equity claim on that business.

Exiting the investment

25. Value eventually has to become cash

A private equity fund can report increasing portfolio values for years.

But ultimately the investment model requires realisation.

Common exit routes include:

• sale to a strategic buyer;
• sale to another private equity fund;
• IPO;
• partial sale;
• or increasingly, transactions involving continuation vehicles.

Until an investment is realised, its valuation remains an estimate.

This creates the crucial distinction between:

value

and:

cash.

Measuring private equity performance

26. Why ordinary ROI is inadequate

This brings us to Part VIII — Measuring Performance.

Suppose an LP invests:

€100 million

and eventually receives:

€200 million.

The investment generated:

2.0×

the invested capital.

But that information is incomplete.

If €200 million was returned after two years, the result is very different from receiving €200 million after twelve years.

Time matters.

27. Why the P&L tells us even less

The annual P&L of a private equity fund can be actively misleading if interpreted as though the fund were an ordinary operating company.

A fund might report a substantial profit because portfolio valuations increased.

But nothing may have been sold.

Another fund might report relatively little accounting profit because it just distributed the proceeds from a highly successful investment whose valuation gains had been recognised in earlier periods.

The P&L describes accounting activity during a period.

It does not by itself describe the economic performance of a private equity fund over its lifecycle.

The J-curve explains why.

IRR

28. Performance must incorporate time

The Internal Rate of Return, or IRR, is one of the principal measures used in private equity because it incorporates the timing of cash flows.

Conceptually, IRR answers:

What annualised discount rate makes the present value of the investment cash flows equal to zero?

In a simple one-investment example:

\[ IRR = \left(\frac{\text{Proceeds}}{\text{Investment}}\right)^{1/n}-1 \]

where \(n\) represents the number of years.

29. The same multiple can produce very different IRRs

Consider a 2.0× return:

The amount of money is identical.

The economic performance is not.

This is why time cannot be separated from private equity performance.

But IRR is not enough

30. A high IRR can tell only part of the story

IRR is extremely useful.

But it can also be affected by the timing of capital calls and distributions.

Early small successes can disproportionately influence an interim IRR.

Subscription credit facilities can delay LP capital calls and therefore increase reported LP IRR without improving the underlying portfolio company's operating performance.

A high IRR also does not tell us how much capital has actually been returned.

For that, additional measures are required.

DPI

31. How much cash came back?

DPI — Distributed to Paid-In Capital is:

\[ DPI = \frac{\text{Cumulative Distributions}} {\text{Paid-In Capital}} \]

If LPs have contributed:

€100 million

and received:

€80 million

in distributions:

\[ DPI = 0.8\times \]

DPI is particularly important because it represents actual distributions.

It does not depend upon an estimate of remaining portfolio value.

RVPI

32. How much value remains?

RVPI — Residual Value to Paid-In Capital is:

\[ RVPI = \frac{\text{Residual Value}} {\text{Paid-In Capital}} \]

Suppose the same fund has:

€120 million NAV

remaining.

Then:

\[ RVPI = 1.2\times \]

This represents value that has not yet been realised.

TVPI

33. How much total value has been created?

TVPI — Total Value to Paid-In Capital combines both:

\[ TVPI = \frac{\text{Distributions + Residual Value}} {\text{Paid-In Capital}} \]

or:

\[ TVPI = DPI + RVPI \]

In our example:

\[ TVPI = 0.8 + 1.2 = 2.0\times \]

The fund therefore reports total value equal to twice paid-in capital.

But only 0.8× has actually been distributed.

The remaining 1.2× still needs to be realised.

The migration from RVPI to DPI

34. A successful fund should eventually turn valuation into cash

Early in a fund's life, most value may be represented by RVPI.

As the fund matures, successful realisations should convert that residual value into distributions.

Conceptually:

RVPI → DPI

while total value is ultimately validated through cash realisation.

A declining NAV is therefore not necessarily bad news for a mature fund.

It may simply mean that investments have been sold and proceeds distributed.

No single performance measure is sufficient

35. IRR, DPI and TVPI belong together

This leads to one of the most important conclusions of this introduction.

A private equity fund should not be judged using one number.

IRR tells us about the time-sensitive return.

DPI tells us how much capital has actually come back.

TVPI tells us the combination of realised and remaining value relative to capital contributed.

Together, after a sufficient period of fund maturity, they begin to describe the economic outcome.

But even then, something is missing.

Context.

Vintage year

36. A 15% IRR is not inherently good or bad

Suppose a fund reports a net IRR of:

15%.

Is that good?

The answer cannot be determined from the number alone.

Imagine the fund invested during a period in which comparable funds generally generated 25%.

The interpretation differs from a 15% return generated by a fund whose comparable peers generally struggled.

Private equity performance therefore needs to be assessed relative to an appropriate benchmark.

And one of the most important dimensions of that benchmark is vintage year.

37. Why vintage matters

Funds beginning their investment programmes in different years encounter different environments.

They may face different:

• acquisition multiples;
• interest rates;
• debt availability;
• economic growth;
• recessionary conditions;
• public-market valuations;
• exit markets;
• and competitive environments.

A 2007-vintage buyout fund did not invest in the same environment as a 2010-vintage fund.

Comparing them without recognising this difference can produce meaningless conclusions.

38. Benchmark like with like

Performance should therefore generally be interpreted relative to funds with sufficiently comparable characteristics, particularly:

• vintage year;
• strategy;
• geography;
• and, where relevant, size.

Even then, benchmarking is imperfect.

Different databases may contain different managers.

Definitions can vary.

Selection and survivorship effects may exist.

But the basic principle remains essential:

Private equity performance is meaningful only in context.

The maturity problem

39. Do not judge a fund too early

The J-curve provides another warning.

Imagine a three-year-old fund reporting:

1.4× TVPI

with:

0.1× DPI.

Most of its reported value remains unrealised.

Now imagine a ten-year-old fund reporting:

1.8× TVPI

with:

1.7× DPI.

The second fund has converted almost all reported value into cash.

The apparent precision of a performance number should therefore not be confused with certainty.

A young fund is still largely a collection of investments and valuations.

A mature fund increasingly becomes a record of realised economic outcomes.

Risk

40. Return is only one side of private equity

The possibility of attractive returns exists because capital is exposed to risk.

This is the subject of Part IX — Risks and Failed Investments.

A portfolio company can:

• lose customers;
• suffer margin compression;
• face technological disruption;
• breach debt covenants;
• lose management;
• require additional capital;
• become impossible to refinance;
• or ultimately fail.

Private equity equity sits below debt in the capital structure.

It therefore absorbs losses first.

41. A company does not have to fail for the investment to fail

This distinction is important.

Suppose a company is acquired for:

€1 billion

using:

€600 million debt

and:

€400 million equity.

Several years later the company is sold for:

€650 million

with €550 million debt remaining.

The company survived.

Employees remained employed.

Customers continued buying its products.

Lenders were largely repaid.

But equity value is only:

€100 million.

The private equity investment lost:

75% of its value.

A functioning company can therefore still be a failed equity investment.

Time can sometimes rescue an investment

42. But only if the company survives

An underperforming investment may recover.

Management can be changed.

Costs can be reduced.

New products can succeed.

Markets can recover.

Debt can be refinanced.

But survival matters.

A heavily leveraged company that runs out of liquidity may not have enough time to wait for the investment thesis to recover.

This is why capital structure and operational performance cannot be analysed independently.

The GP/LP relationship

43. Who bears the risk and who makes the decisions?

We now arrive at Part X — GP/LP Alignment.

The LP provides most of the capital.

The GP decides:

• what to buy;
• what price to pay;
• how much leverage to use;
• who should manage the business;
• whether to invest additional capital;
• and when to sell.

This creates an obvious agency problem.

The party controlling the investment is not the party providing most of the money.

Private equity therefore requires mechanisms to align their interests.

GP commitment

44. The GP invests alongside the LP

One mechanism is the GP commitment.

The GP and/or its principals contribute their own capital to the fund.

If the fund loses money, they therefore lose money too.

This creates downside alignment.

But it is only part of the solution.

Management fees

45. The GP needs to operate

Private equity firms require staff, offices, systems, compliance, finance functions and investment infrastructure.

Management fees finance that organisation.

But if the GP's economics consisted entirely of guaranteed management fees, the relationship between investment performance and GP compensation would be relatively weak.

A performance incentive is therefore required.

Carried interest

46. The bridge between investment success and GP economics

That performance incentive is carried interest.

At the most conceptual level:

If the GP creates sufficient investment profits for the LPs, the GP participates in those profits.

This gives the GP economic exposure to successful investment outcomes beyond the return on its own invested capital.

Carried interest therefore forms a central part of GP/LP alignment.

Carry is not the whole alignment system

47. Incentives need controls

Carry provides powerful upside incentives.

But precisely because those incentives are powerful, private equity funds also use mechanisms such as:

• GP commitment;
• investment restrictions;
• governance provisions;
• key-person clauses;
• LP advisory committees;
• clawback mechanisms;
• reporting;
• and reputational discipline.

Alignment is therefore an architecture rather than a single percentage.

This is explored in Part X.

Why carry follows naturally from everything above

48. The complete chain

We can now connect the entire private equity model:

Capital is committed

↓

The GP selects investments

↓

Private companies are acquired

↓

Capital is locked into illiquid assets

↓

The GP attempts to create value

↓

Leverage may amplify the equity outcome

↓

Time produces the J-curve

↓

Some investments succeed and others fail

↓

Successful investments are realised

↓

Cash is distributed

↓

Fund performance becomes measurable

↓

The GP participates in successful outcomes

↓

Carried interest

This is why carried interest cannot really be understood by beginning with a waterfall formula.

The economics come first.

49. Why the J-curve is the key to understanding the whole system

If there is one concept that connects almost everything in this introduction, it is the J-curve.

The J-curve tells us that private equity is not an annual accounting exercise.

It is a lifecycle.

Capital is committed before it is invested.

Capital is invested before value is created.

Value may be created before it is realised.

Value is realised before cash is distributed.

And only after sufficient time has passed can we meaningfully assess whether the original investment decisions were successful.

That observation explains why:

• annual P&L is insufficient;
• ROI is insufficient;
• NAV alone is insufficient;
• IRR needs DPI and TVPI;
• benchmarking requires vintage-year context;
• carry may develop over many years;
• and the economic history of the fund matters.

The J-curve is therefore not simply one characteristic of private equity.

It is one of the best ways to understand why the entire economic architecture of private equity looks the way it does.

50. The ten-minute mental model

For the reader who remembers nothing else from this introduction, remember this:

A private equity fund is not an ordinary company whose success can be judged from its annual P&L.

It is a long-duration investment vehicle.

LPs commit capital to a GP.

The GP gradually calls that capital and invests it in private businesses.

Those businesses are difficult and expensive to acquire and sell, which makes investment selection particularly important.

The GP attempts to increase their value through growth, operational improvement, strategic change, acquisitions and better capital allocation.

Debt is frequently used to finance part of the acquisition. It can amplify the return on equity, but it also amplifies losses and can threaten the survival of an underperforming investment.

Because investments take years to mature and realise, the fund develops a J-curve. Early accounting results therefore tell us relatively little about ultimate fund performance.

Performance becomes increasingly meaningful as the fund matures and can be evaluated using IRR together with DPI and TVPI.

Those measures should not be interpreted in isolation. They need to be compared with appropriate funds of a similar strategy and vintage year.

Ultimately, the investment model depends upon a relationship between two parties:

The LP supplies most of the capital.

The GP supplies the investment judgement and controls the investment process.

That separation creates the need for alignment.

And one of the principal mechanisms through which that alignment is achieved is carried interest.

That is all the reader needs to know about private equity to begin understanding the subject of this site.

For everything else, the detailed Parts that follow explain the journey from the origins of private equity to the point at which investment performance becomes carried interest.

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