Relevant cash flows

Q: What three criteria define a relevant cash flow in capital investment appraisal?

A relevant cash flow must be future , incremental , and an actual movement of cash (the FIC framework).

Q: How is an opportunity cost treated in capital investment decision making?

An opportunity cost is treated as a relevant cash outflow equal to the economic benefit forgone by choosing the project over its best alternative.

Q: How is working capital treated over the lifecycle of a capital investment project?

Initial and incremental working capital commitments are cash outflows , while cumulative working capital is fully recovered as a cash inflow at the end of the project ( $t_n$).

Q: What is the Fisher equation, and what fundamental rule dictates the choice between the real and nominal approach under inflation?

The Fisher equation is $1 + i = (1 + r)(1 + h)$, and the nominal approach must be used whenever cash flows inflate at different specific rates.

P2 – Advanced Management Accounting · CIMA (CGMA Professional Qualification) · 6 min read · Updated: Nov 6, 2026

Welcome to Relevant Cash Flows in Capital Investment!

Hello there! Welcome to one of the most critical topics in your P2 Advanced Management Accounting journey. Before evaluating medium-term capital investment proposals using Net Present Value (NPV) or Internal Rate of Return (IRR), we must ensure we are identifying and measuring the correct cash flows over the entire project lifecycle. That is what Relevant Cash Flows is all about.

In capital investment appraisal, we focus exclusively on costs and revenues that change as a direct consequence of accepting an investment proposal. In this chapter, we explore the fundamental criteria of relevant cash flows, their specific timing across a project lifecycle, and how to adjust for working capital, taxation, inflation, terminal perpetuities, and non-financial factors.

1. What Makes a Cash Flow "Relevant"?

For a cash flow to be relevant in capital investment decision making, it must satisfy three core criteria (the FIC framework):

1. Future: It must occur in the future. Past costs have already happened and cannot be changed by the current decision.
2. Incremental: It must be an extra cash flow arising directly from accepting the project. Cash flows that would happen anyway are not relevant.
3. Cash: It must represent an actual movement of funds. Non-cash accounting entries (such as depreciation or book amortisation) are omitted.

Irrelevant Items to Exclude

Sunk Costs: Costs already incurred or committed in the past (such as past market research or preliminary feasibility studies). Example: Spending \$15,000 last month on an engineering survey is sunk and excluded.
Committed Costs: Future costs that cannot be avoided whether the project is accepted or rejected (for instance, an unbreakable existing contract).
Absorbed Overheads: General central management or head-office overheads allocated to the project. Only incremental fixed overheads specifically generated by the project are relevant.
Financing Cash Flows: Interest payments, loan repayments, and dividends. These financing costs are accounted for in the project discount rate (cost of capital), so including them in operating cash flows would cause double-counting.

2. Opportunity Costs

Opportunity cost is the economic benefit forgone by selecting one alternative over the next best alternative. Even if an asset is already owned and requires no immediate cash purchase, using it on a project is not cost-free if it has an alternative profitable use.

Example: If a proposed project will occupy an existing company-owned warehouse that could otherwise be leased to an external tenant for \$20,000 per year, that lost rental income represents a relevant cash outflow (opportunity cost) for the project.

3. Project Lifecycle Timings

Capital projects unfold over distinct phases across time. In investment appraisal, cash flow timing is represented along a timeline where:
- Time 0 ( $t_0$): The present moment when the initial capital outlay is committed.
- Times 1 to $n$ ( $t_1, t_2, \dots, t_n$): The operating years over the project life, typically assumed to occur at the end of each respective year.
- Terminal Year ( $t_n$): The end of the project life, where asset disposal receipts, final tax effects, and working capital recovery take place.

4. Working Capital Movements

Most capital investment projects require an initial commitment of working capital at $t_0$ (e.g., inventory and trade receivables less trade payables) to support operations:

1. Initial Injection: Cash outflow at $t_0$ to set up inventory and operations.
2. Incremental Adjustments: As production or sales expand (or inflation increases nominal working capital requirements), additional incremental working capital is invested at the start of that year (cash outflow). If requirements decrease, cash is released (cash inflow).
3. Full Terminal Recovery: At the end of the project lifecycle ($t_n$), inventories are liquidated and receivables collected. Therefore, the total cumulative working capital invested is assumed to be fully recovered as a cash inflow at $t_n$.

5. Taxation and Capital Allowances

Corporation tax significantly alters relevant net cash flows in two distinct ways:

1. Tax on Operating Cash Flows: Net operating profits (revenues minus relevant cash costs) generate a tax liability. Operating cash inflows multiplied by the corporate tax rate represent a tax outflow.
2. Tax Relief from Capital Allowances (Tax Depreciation): Accounting depreciation is not cash and is not tax-deductible directly. Instead, tax authorities grant tax depreciation / capital allowances on qualifying capital expenditures. The tax shield or relief equals:
$\text{Tax Savings} = \text{Capital Allowance} \times \text{Tax Rate}$
This tax relief constitutes a relevant cash inflow (or reduction in tax payments). On asset disposal, a balancing allowance or balancing charge is calculated to reconcile total tax allowances with the actual net economic depreciation (Initial cost minus scrap proceeds).
Timing of Tax Flows: Tax liabilities and reliefs may occur in the same year as the related operating profit, or with a time lag (e.g., paid one year in arrears, so cash flows from year $t$ generate tax effects in year $t+1$), depending on the exam specification.

6. Accounting for Inflation: Real vs Nominal Cash Flows

Inflation erodes purchasing power over the project lifecycle. When appraising capital investments, cash flows and discount rates must be matched consistently:

Real Approach: Real cash flows (stated in constant, base-year price levels with no inflation) discounted at the real discount rate.
Nominal (Money) Approach: Nominal cash flows (adjusted for expected inflation rates each year) discounted at the nominal (money) discount rate.

The relationship between real interest rates ( $r$), nominal interest rates ( $i$), and the general inflation rate ( $h$) is expressed through the Fisher equation:
$1 + i = (1 + r)(1 + h)$

Rule: If specific project cash flows inflate at different rates (e.g., sales prices rise at 4% while labour costs rise at 6%), the nominal approach must be used: inflate each flow at its specific rate and discount using the nominal cost of capital.

7. Project Terminal Value Using Perpetuities

Certain capital investments continue operating indefinitely or are appraised over a finite horizon followed by ongoing stable cash flows. In such cases, the final project terminal value at $t_n$ can be derived using the perpetuity formula:

Constant Perpetuity: For a level annual cash flow $CF$ starting after year $n$ with discount rate $r$:
$\text{Perpetuity Value at } t_n = \frac{CF}{r}$

Growing Perpetuity: Where the terminal cash flow is expected to grow at a constant compound annual growth rate $g$ indefinitely:
$\text{Terminal Value at } t_n = \frac{CF_{n+1}}{r - g} = \frac{CF_n (1 + g)}{r - g}$

This terminal value calculated at $t_n$ is then discounted back to $t_0$ like any other terminal receipt to establish the project's total net present value.

8. Non-Financial Factors in Medium-Term Decision Making

Financial analysis alone does not determine capital investment decisions. Management must evaluate critical non-financial and qualitative factors alongside relevant cash flows:

Strategic Alignment: Does the investment fit long-term organisational goals and competitive positioning?
Environmental, Social and Governance (ESG) Impact: Carbon footprint, pollution, waste disposal, community relations, and compliance with emerging sustainability legislation.
Employee and Operational Morale: Working conditions, training requirements, job security, and safety standards.
Reputational and Public Interest Risks: Impact on brand equity, customer loyalty, and public trust.

Summary Table: Treatment of Capital Investment Cash Flows

Initial Capital Expenditure: Relevant cash outflow at $t_0$.
Accounting Depreciation: Irrelevant; add back / ignore.
Tax Relief on Capital Allowances: Relevant cash inflow (timing matches tax payment rules).
Working Capital Injected: Relevant cash outflow when invested.
Working Capital Recovered: Relevant cash inflow at terminal year ($t_n$).
Opportunity Cost: Relevant cash outflow (cash benefit forgone).
Interest / Financing Charges: Excluded from operating cash flows (included in discount rate).
Terminal Value (Perpetuity): Relevant cash inflow at $t_n$ reflecting ongoing project worth.

References

Management level Examination Blueprint 2026-2027 — AICPA & CIMA
CGMA Professional Qualification Examination Blueprint: Management Level — CIMA

Quick check

Can you answer these now?

Open each question to check the key ideas from this chapter.

What three criteria define a relevant cash flow in capital investment appraisal?

A relevant cash flow must be future, incremental, and an actual movement of cash (the FIC framework).

Why are sunk costs, committed costs, and financing costs excluded from project operating cash flows?

Sunk and committed costs cannot be altered by the decision, while financing costs are already reflected in the discount rate and would otherwise be double-counted.

How is an opportunity cost treated in capital investment decision making?

An opportunity cost is treated as a relevant cash outflow equal to the economic benefit forgone by choosing the project over its best alternative.

How is working capital treated over the lifecycle of a capital investment project?

Initial and incremental working capital commitments are cash outflows, while cumulative working capital is fully recovered as a cash inflow at the end of the project ( $t_n$).

How do capital allowances (tax depreciation) affect relevant cash flows?

They generate a relevant cash inflow in the form of a tax saving calculated as $\text{Capital Allowance} \times \text{Tax Rate}$.

What is the Fisher equation, and what fundamental rule dictates the choice between the real and nominal approach under inflation?

The Fisher equation is $1 + i = (1 + r)(1 + h)$, and the nominal approach must be used whenever cash flows inflate at different specific rates.

How is the terminal value calculated for a project that delivers cash flows growing at a constant rate indefinitely after year $n$?

$\text{Terminal Value at } t_n = \frac{CF_{n+1}}{r - g} = \frac{CF_n (1 + g)}{r - g}$

Why must non-financial and ESG factors be evaluated alongside quantitative relevant cash flows in capital appraisal?

They highlight strategic alignment, sustainability impacts, and reputational risks that numerical cash flows do not capture, preventing costly long-term failures.

Ready to test yourself?

Turn these notes into exam-style practice. Get unlimited AI questions on this topic with instant marking and explanations.

Practice This Topic

More P2 – Advanced Management Accounting chapters

* The content provided by thinka is generated by AI and may not always be accurate or up-to-date. Please use it as a supplementary resource and verify with official materials.

Put These Notes into Practice

Reading the notes is a great start. Now practice with unlimited AI-generated questions and get instant feedback. 100,000+ students are already improving their grades.

Start Practicing Now View Pricing

Done reading? Test yourself with AI practice questions

Practice This Topic Now