Author: Gert-Tom Draisma / www.TristanFinance.com
First published: 24th of September 2026
Latest update: 28th of September 2026
1. The final piece of the private equity model
The preceding Parts have explained the economic environment in which carried interest exists.
We began with the origins and development of private equity, before examining what makes private equity fundamentally different from investing in publicly traded securities.
We then looked at the private equity fund itself: a structure in which investors commit capital for a long period and delegate investment responsibility to a specialist manager.
From there, we examined illiquidity and transaction friction. Private companies cannot normally be bought and sold instantaneously at observable market prices. Investments must be sourced, investigated, negotiated, financed, managed and ultimately sold.
That process takes time.
As Part V — The J-Curve demonstrated, capital is generally contributed before investment value has had time to develop. Costs occur early. Investments mature over years. Distributions tend to occur much later.
That, in turn, led us to Part VI — How Value Is Created. Private equity returns can arise from a combination of entry price, revenue growth, margin improvement, strategic and organisational transformation, acquisitions, cash generation, debt reduction and changes in valuation multiples.
Part VII — Leverage and Capital Structure then showed how debt changes the economics of the equity investment. Leverage can amplify successful value creation, but it can equally amplify losses.
This brought us to Part VIII — Measuring Performance. Because private equity capital is contributed and returned at different points in time, conventional measures such as annual accounting profit, ROI or a single-period P&L tell us remarkably little about the economic performance of a private equity fund. Meaningful assessment requires measures such as IRR, DPI and TVPI, interpreted after sufficient fund maturity and, critically, relative to appropriate funds of the same vintage year and comparable strategy.
Part IX — Risk, Underperformance and Failed Investments then reminded us that none of these returns is guaranteed. Private equity involves genuine risk of permanent capital loss.
Finally, Part X — GP/LP Alignment introduced the economic relationship that brings us to carried interest.
The LP provides most of the capital.
The GP controls the investment process.
How should the economic interests of those two parties be brought together?
That is where carried interest begins.
2. Capital and investment expertise
A private equity fund combines two things that need each other.
The first is capital.
The second is the ability to deploy that capital successfully.
An LP may have hundreds of millions or billions available for investment. But the capital itself does not identify attractive businesses, negotiate acquisitions, conduct due diligence, arrange financing, appoint management, execute transformation programmes or create exits.
The GP provides that investment capability.
Conversely, the most talented investment team in the world cannot acquire businesses without capital.
Private equity therefore creates a partnership between:
those who provide the capital
and
those who make and manage the investments.
That relationship is at the heart of the private equity fund.
3. The agency problem
But, as discussed in Part X, the relationship contains an inherent tension.
The LP bears most of the financial risk.
The GP makes most of the investment decisions.
If the GP were compensated entirely through a fixed management fee, its economic outcome would be only weakly connected to the investment outcome experienced by the LP.
A fund producing exceptional returns and a fund producing disappointing returns could generate broadly similar management-fee income.
Private equity therefore requires another mechanism.
The GP needs meaningful economic participation in the success of the investments it manages.
That participation is carried interest.
4. The basic idea
At the highest level, the concept is remarkably simple.
The investors provide the capital.
The investment manager attempts to generate a return on that capital.
If sufficient value is created, the investment manager participates in the resulting profits.
That participation creates a powerful economic connection between the GP and the LP:
If the LP does well, the GP can do well.
Carried interest is therefore fundamentally an alignment mechanism.
That is the most important concept to understand before examining any of its mechanics.
5. Carry cannot be separated from performance
This also explains why the preceding discussion of performance measurement was so important.
Carry does not exist in an accounting vacuum.
Private equity performance develops through the J-curve described in Part V.
Capital is called at different times.
Investments are acquired at different times.
Value is created over different holding periods.
Some investments are realised early.
Others remain unrealised for many years.
Some succeed.
Others fail.
NAV can rise long before cash is returned.
And, as Part VIII demonstrated, a fund cannot sensibly be judged simply by looking at its P&L or calculating a conventional ROI.
The economic outcome emerges over time.
Carried interest necessarily exists within that same economic history.
6. Carry therefore belongs to the entire fund lifecycle
Carried interest is sometimes approached as though it were a calculation performed at the end of an investment:
Profit × carry percentage = carried interest.
That greatly understates what carry represents.
The economic conditions that eventually determine carried interest begin much earlier.
They begin when investors enter the fund and commit capital.
They continue when capital is called.
They develop as investments are made, managed, valued and realised.
They are affected by distributions, losses and the passage of time.
And they ultimately need to reflect the economic agreement between the GP and the LP.
Carry is therefore not an isolated event at the end of the fund.
It is connected to the entire economic lifecycle of the fund.
7. Why the subject becomes complicated
The basic principle of carried interest may be simple.
Implementing it is not.
Once we move beyond the principle, questions immediately arise.
What constitutes profit?
When has sufficient performance been achieved?
Which capital must first be returned?
How does the passage of time affect the calculation?
How should early gains and later losses interact?
When is carry earned?
When can it be distributed?
Who is entitled to it?
What happens if circumstances subsequently change?
And, perhaps most importantly:
How do we translate an economic agreement written in legal documents into a calculation that remains correct throughout a fund that may exist for fifteen years or more?
These are the questions to which the remainder of this work is devoted.
8. More than a formula
This is also why carried interest should not be understood merely as a formula.
A formula is only the final mathematical expression of a much larger economic arrangement.
To understand carry properly requires an understanding of:
private equity economics
→ fund structure
→ cash flows
→ performance
→ risk
→ GP/LP alignment
→ the contractual allocation of investment profits.
The preceding Parts have provided that foundation.
The remainder of The Carried Interest Bible builds upon it.
9. The recurring theme: economic substance
One theme will recur throughout the chapters that follow.
There is often a difference between:
what has been recorded
and
what it means economically.
This was already visible in Part VIII.
A quarterly P&L can be perfectly correct while telling us very little about the ultimate performance of a young private equity fund.
A NAV can be correctly calculated while still consisting largely of unrealised value.
A Capital Account Statement can be correct without by itself explaining the complete economic history underlying carried interest.
This distinction between accounting information and economic meaning becomes particularly important when we later examine carry data, administration and calculation.
10. Understanding the “why” before the “how”
The purpose of this introduction has therefore been deliberately broader than carried interest itself.
Before studying waterfalls, hurdles, allocations, vesting, data structures or calculations, it is necessary to understand the economic system in which they operate.
Otherwise carried interest easily becomes:
a percentage applied to a number.
And that misses the point.
Carried interest exists because private equity combines long-term external capital with delegated investment judgement.
It exists because value creation takes time.
It exists because investment outcomes are uncertain.
It exists because the people controlling investment decisions need to share economically in successful outcomes.
And it exists within a fund structure in which the ultimate result may not become clear until many years after the first capital was committed.
11. From the introduction to The Carried Interest Bible
We can therefore reduce everything developed in this introduction to one chain:
LP capital↓
GP investment judgement
↓
Private and illiquid investments
↓
Time and the J-curve
↓
Value creation
↓
Risk and leverage
↓
Realisation and distributions
↓
Performance
↓
GP/LP alignment
↓
Carried interest
This is the point at which the introduction ends.
The question is no longer why carried interest exists.
We have established that.
The questions from here are how carried interest actually works, how it is structured, how it is calculated, how it is allocated, how it is accounted for, how the necessary data are maintained, and how it should be administered over the complete life of a private equity fund.
Those questions form the subject of the rest of The Carried Interest Bible.
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