This chapter is your quick reference. It collects the key financial metrics, accounting concepts, and decision-quality terms that show up repeatedly in business cases, and it gives you a short checklist to keep terminology clean and consistent. Use this as a back-of-the-book glossary and as a training tool for new team members.
26.1 Core Investment Metrics and Formulas
These are the workhorse metrics you’ll use in almost every business case. The important thing is not the algebra itself, but that everyone on the team uses the same definitions and horizons.
Net Present Value (NPV)
NPV is the sum of all incremental future cash flows, discounted back to today, minus the initial investment.
Formula (conceptual):
- NPV = sum over t of [CF_t / (1 + r)^t] – I_0
- Where:
CF_t = incremental net cash flow in period t (vs baseline)
r = discount rate (typically WACC or policy rate)
t = time period (1…n)
I_0 = initial net investment (period 0 cash outflow, if applicable)
Key points:
- Always use incremental cash flows vs the “do nothing” baseline.
- Horizon and r must be identical across options.
- NPV > 0 means value-creating at that discount rate.
Internal Rate of Return (IRR)
IRR is the discount rate at which NPV equals zero.
- Conceptually: find r such that
- sum over t of [CF_t / (1 + r)^t] – I_0 = 0
Key points:
- Good for comparing projects of similar scale and timing.
- Sensitive to timing; front-loaded benefits produce high IRR.
- Can be misleading for unusual cash-flow patterns (multiple sign changes).
Payback Period
Payback is how long it takes for cumulative net cash flow to become positive.
- Simple payback:
- Count periods until cumulative (undiscounted) CF ≥ 0.
- Discounted payback:
- Same concept, but use discounted cash flows.
Key points:
- Intuitive and useful for liquidity- and risk-sensitive stakeholders.
- Ignore value created after the payback point.
- Often used as a constraint (e.g., “payback must be under 4 years”).
Return on Investment (ROI)
ROI gives a simple ratio of net gain to investment.
- Formula (for a period or horizon):
- ROI = (Total Benefits – Total Costs) / Total Costs
Key points:
- Easy to communicate, but can hide timing.
- Better as a supporting metric than as the primary investment test.
Profitability Index (PI)
PI is NPV per unit of investment.
Formula:
- PI = (Present Value of Future Cash Inflows) / Initial Investment
Key points:
- Useful when capital is constrained and you need to rank projects.
- A PI > 1 suggests value creation (similar interpretation to NPV > 0).
Economic Profit / EVA-style measures (optional)
Some organizations track economic profit (EP) or Economic Value Added (EVA):
- EP (simplified):
- EP = NOPAT – (Capital Employed × Cost of Capital)
Key points:
- Helps link project performance to overall return on capital.
- More common in mature capital-intensive organizations.
You do not need to use every metric in every case. In most corporate settings, NPV, IRR, payback, and a clear cash profile will be enough, with ROI or PI as supporting views where helpful.
26.2 Accounting Concepts Relevant to Business Cases
You don’t need to be a technical accountant, but you must understand the key concepts that impact how your case interacts with the P&L, balance sheet, and cash flow.
Capex vs OpEx
- Capital Expenditure (Capex):
- Spend on assets that provide benefits over multiple years (e.g., plant, equipment, capitalized software).
- Appears as an asset on the balance sheet and is then depreciated or amortized through the P&L.
- Operating Expenditure (OpEx):
- Day-to-day operating costs (e.g., salaries, rent, SaaS subscriptions, utilities).
- Expensed in the P&L as incurred.
In the economic model, you care about the cash timing; but for CFO and Board, the accounting treatment (Capex vs OpEx) also matters for earnings and ratios.
Depreciation and Amortization
- Depreciation: allocation of a tangible asset’s cost over its useful life (e.g., machinery, buildings).
- Amortization: similar concept for intangible assets (e.g., software, acquired IP).
Key points:
- Non-cash in each period, but results from prior Capex.
- Affects P&L (EBIT, net income) but not current-period cash.
- Important for understanding reported earnings, but in NPV you focus on actual cash flows.
Working Capital
Working capital represents short-term funding tied up in operations:
- Typically: Working Capital = Current Assets – Current Liabilities
- Core components for business cases:
- Inventory
- Trade receivables (customers owing you money)
- Trade payables (you owing suppliers)
Implications for cases:
- Growth often increases working capital needs (more stock, more receivables).
- Efficiency initiatives may release cash (lower inventory, faster collections, better payables management).
- Working capital changes are real cash flows and should appear in your model.
Direct vs Indirect Costs
- Direct costs: can be clearly traced to the initiative or product (e.g., dedicated staff, materials, specific subscriptions).
- Indirect costs (overheads): shared across multiple activities (e.g., corporate rent, HR, general IT).
In business cases, focus on incremental direct costs first. Only include indirect allocations where they truly change because of the decision (e.g., new leased space).
Fully loaded vs marginal cost
- Fully loaded cost: includes salary, benefits, overhead allocation, and sometimes risk and capital charges.
- Marginal cost: the additional cash cost of producing one extra unit or delivering one extra service.
Both are useful:
- Use fully loaded when sizing people-related savings or long-term run-rate impacts.
- Use marginal when analyzing pricing, volume, and short-term decisions.
Accruals, provisions, and one-offs
- Accruals: accounting entries that recognize expenses or revenues before cash moves (e.g., bonuses earned but not yet paid).
- Provisions: liabilities recognized for estimated future outflows (e.g., restructuring, legal claims).
- One-offs: unusual, non-recurring items presented separately to inform users of the accounts.
In the business case:
- Distinguish between economic reality (cash and risk) and accounting presentation (which period shows what).
- Work with finance to ensure you are consistent with policy when forecasting P&L.
Leases
In many jurisdictions, major leases (e.g., real estate, long-term equipment) are capitalized:
- Right-of-use asset on the balance sheet.
- Lease liability (future payments).
- P&L split into depreciation and interest.
For the business case:
- Focus first on the all-in cash profile of lease vs buy vs other options.
- Then validate with finance how this translates into reported metrics.
Impairment
If an asset’s recoverable value drops below its carrying amount, an impairment is recognized as a hit to the P&L.
Why it matters for cases:
- Over-optimistic cases that don’t deliver can create future impairments, particularly in M&A and large tech/platform investments.
- Boards care because impairment is a public admission that the original investment case did not hold.
Your job: build realistic economics and clear downside scenarios to avoid “inevitable” future impairments.
26.3 Decision-Quality and Risk Terminology
Beyond finance and accounting, business cases live in a decision and risk environment. Shared vocabulary matters.
Decision-quality terms
- Decision rights: who has the authority to decide (approve, deny, modify) on a given question. Often codified in delegations of authority.
- Decision criteria: the agreed factors used to compare options (e.g., NPV, strategic fit, risk, feasibility, time to impact).
- Pre-wiring: engaging key stakeholders before the formal decision to socialize logic, test assumptions, and refine the case.
- Red-team review: an independent challenge designed to find weaknesses in your case.
- Reference class / base-rate thinking: using outcomes from similar past initiatives as a grounding point, rather than inventing assumptions from scratch.
- Biases: systematic thinking errors that show up in cases:
- Optimism bias (overestimating upside, underestimating cost/time/risk).
- Anchoring (sticking too close to an initial estimate).
- Confirmation bias (seeking data that supports your preferred view).
Risk and control terms
- Risk: the effect of uncertainty on objectives, typically thought of as a combination of likelihood and impact.
- Uncertainty: not knowing precisely what will happen; may not be quantifiable with a probability.
- Risk appetite: the amount and type of risk an organization is willing to accept in pursuit of its objectives.
- Risk capacity: how much risk the organization could bear without threatening its viability (often linked to capital and liquidity).
- Inherent risk: risk level before considering new or specific controls.
- Residual risk: risk remaining after controls and mitigations are in place.
- Control: measure that manages risk by reducing likelihood or impact (e.g., approvals, testing, monitoring, segregation of duties).
- KRI (Key Risk Indicator): metric that signals changes in risk exposure (e.g., incident rates, near misses, control failures).
- Scenario: a coherent story of how multiple assumptions might change together (e.g., recession, regulatory shock, competitor entry).
- Sensitivity: analysis that varies one assumption at a time to see its effect on outcomes.
- Tail risk: low-probability, high-impact events at the extremes of the distribution.
- Expected loss: average loss over time, given frequency and severity of events (common in credit and operational risk).
- Stress test: analysis designed to see how the case behaves under particularly adverse conditions, beyond the base and simple downside.
Portfolio and governance terms
- Portfolio view: looking at multiple initiatives together to understand overall value, risk, and capacity usage.
- Stage gate: formal decision points between phases (concept, pilot, scale, sustain) where funding and scope can be re-confirmed or revised.
- Stop-loss / exit criteria: predefined conditions under which the initiative should be paused, re-scoped, or terminated.
Business cases are stronger when they use these terms consistently and align them with the organization’s enterprise risk and decision frameworks.
26.4 Glossary Use Checklist
You don’t need to enforce a 50-page glossary in your organization, but you do need just enough standardization so that “NPV,” “Capex,” and “residual risk” mean the same thing to finance, IT, risk, and the business.
Use this checklist as you finalize your case or as you shape your internal templates.
Core financials
- NPV, IRR, and payback are defined in line with corporate standards (same discount rate, same horizon).
- All team members use the same understanding of “incremental cash flow” (vs total business P&L).
- ROI, PI, or other metrics (if used) are clearly defined and not casually reinterpreted.
Accounting language
- Capex vs OpEx classification is agreed with finance; these terms are used consistently in the case.
- Working capital, depreciation, and amortization are correctly described and not conflated with cash.
- One-off, restructuring, or exceptional items are labeled clearly and treated consistently.
- Lease, impairment, and provision terminology (if relevant) match accounting policy.
Risk and decision terms
- Risk, uncertainty, and volatility are not used interchangeably; risk is tied to objectives.
- Inherent vs residual risk is clearly distinguished; risk appetite is referenced where relevant.
- “Scenario” and “sensitivity” are used correctly (multi-assumption vs single-assumption changes).
- Stage gate, stop-loss, and decision rights are described in language your governance forums recognize.
Options and scope
- Baseline (“do nothing”) is clearly defined and not mixed up with partial improvements.
- “Option,” “scenario,” and “variant” are used distinctly (options = structural choices; scenarios = different futures; variants = packaging/presentation).
- In-scope and out-of-scope are aligned with how portfolio and PMO functions use those terms.
Consistency across documents
- Terms in the business case align with your strategy documents, risk framework, and finance policies; no “private dialects.”
- Option names, KPI labels, and risk names are identical across memo, slides, model, and appendices.
- Any specialized or less common term is briefly defined on first use in the main document (or linked to a shared internal glossary).
