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internal rate of return

Low
UK/ɪnˌtɜːnəl reɪt əv rɪˈtɜːn/US/ɪnˌtɜrnəl reɪt əv rɪˈtɜrn/

Formal, Technical, Professional

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Definition

Meaning

A metric used in capital budgeting to estimate the profitability of potential investments. It is the discount rate that makes the net present value of all cash flows from a particular project equal to zero.

In more advanced applications, IRR is used to rank multiple prospective projects based on their anticipated profitability, with higher IRR generally being preferred. It is also used to evaluate the efficiency of an investment, such as the expected growth rate of an investment portfolio over time.

Linguistics

Semantic Notes

IRR is a specific, mathematically derived rate, not a general return figure. It inherently assumes reinvestment of interim cash flows at the same rate, which is a key limitation and point of professional discussion.

Dialectal Variation

British vs American Usage

Differences

No significant lexical differences. The term is a precise technical compound noun used identically in both finance and academia.

Connotations

Identical professional and technical connotations in both regions.

Frequency

Equally frequent in the professional finance, investment, and corporate sectors in both the UK and US.

Vocabulary

Collocations

strong
calculate the internal rate of returnproject's internal rate of returnIRR (acronym)net present value and internal rate of return
medium
a high internal rate of returnexpected internal rate of returndiscount ratecash flow analysis
weak
compare internal ratesrate of return metricinvestment appraisal

Grammar

Valency Patterns

The IRR of [PROJECT/INVESTMENT] is [PERCENTAGE].To calculate/use IRR for [PURPOSE].[PROJECT] yields/generates an IRR of [X]%.

Vocabulary

Synonyms

Strong

IRR

Neutral

discounted cash flow rate of return

Weak

economic rate of returntime-adjusted rate of return

Vocabulary

Antonyms

net lossnegative returncapital destruction

Phrases

Idioms & Phrases

  • “The project hit its IRR hurdle.”
  • “It's an IRR-positive venture.”

Usage

Context Usage

Business

Used in board meetings, investment proposals, and financial analysis to justify or compare capital expenditure projects.

Academic

Taught in finance, economics, and business studies courses; a standard topic in corporate finance textbooks.

Everyday

Virtually never used in everyday conversation. May appear in personal investment advice articles.

Technical

A core concept in financial modelling, project finance, private equity, and venture capital deal evaluation.

Examples

By Part of Speech

verb

British English

  • The model will IRR the cash flows.
  • We need to IRR these projections.

American English

  • The software can IRR the stream.
  • They asked us to IRR the proposal.

adverb

British English

  • The project performed IRR-positively.
  • The funds were allocated IRR-consciously.

American English

  • They invested IRR-advantageously.
  • The decision was made IRR-neutrally.

adjective

British English

  • The IRR calculation is complex.
  • We reviewed the IRR methodology.

American English

  • The IRR figure looked promising.
  • An IRR analysis was performed.

Examples

By CEFR Level

B1
  • The company uses IRR to check if a new machine is a good investment.
  • A higher internal rate of return means a better project.
B2
  • Although the project's IRR is attractive, the initial investment is prohibitively high.
  • Analysts compared the IRR of the two expansion plans before making a recommendation.
C1
  • The venture capital fund demands a minimum IRR of 25% on all its investments, accounting for the high risk involved.
  • Critics of IRR point to its reinvestment rate assumption as a fundamental flaw, preferring the Modified Internal Rate of Return (MIRR) in certain contexts.

Learning

Memory Aids

Mnemonic

IRR helps decide if an investment is Internally Really Rewarding by finding the rate where future cash equals today's cost.

Conceptual Metaphor

INVESTMENT PROFITABILITY IS A RATE (a speed of growth). PROJECT EVALUATION IS A HURDLE RACE (the IRR is the hurdle to clear).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Avoid translating it as 'внутренняя норма доходности' and then using it in a general, non-technical sense for any 'rate of return'. It is a specific calculation.
  • The acronym 'IRR' (ИРД) is commonly used in professional Russian finance texts as well.

Common Mistakes

  • Pronouncing 'IRR' as 'ear' instead of spelling out 'I-R-R'.
  • Using 'internal rate of return' to mean a simple interest rate or annual percentage yield (APY).
  • Assuming a higher IRR is always better without considering project scale or risk (the 'scale problem').

Practice

Quiz

Fill in the gap
A key decision rule in capital budgeting is to accept a project if its exceeds the firm's required rate of return.
Multiple Choice

What is the primary purpose of calculating the Internal Rate of Return (IRR)?

FAQ

Frequently Asked Questions

Not always. While a higher IRR generally indicates a more profitable project, it doesn't account for the project's scale, duration, or risk. A small project with a very high IRR might be less valuable than a large project with a moderately high IRR.

Net Present Value (NPV) gives a monetary value (e.g., £1 million) of a project's worth in today's money, while IRR provides the percentage rate of return the project is expected to generate. They are related, as IRR is the discount rate that makes NPV equal to zero.

Yes. A negative IRR indicates that the project's cash flows, when discounted, result in a value less than the initial investment, meaning the project is expected to destroy value on a time-adjusted basis.

The classic IRR calculation assumes that all interim cash flows from the project can be reinvested and earn the same high IRR, which is often unrealistic. This flaw can lead to overstating a project's true profitability, which is why metrics like MIRR exist.