Glossary

Sensitivity Analysis

Sensitivity analysis is the quantitative assessment of how much a financial model's output changes when a single input variable is changed by a defined amount, while all other variables are held at their base case values. It measures the responsiveness — or sensitivity — of outputs to individual assumption changes. Sensitivity analysis is distinct from scenario analysis, which changes multiple assumptions simultaneously to reflect a coherent alternative state. Sensitivity analysis isolates the effect of individual variables; scenario analysis tests the combined effect of assumption sets.

Share Buyback

A share buyback (or share repurchase) is a transaction in which a company buys back its own outstanding shares, either through open-market purchases over time or via a tender offer to shareholders at a specified price. The immediate mechanical effect is a reduction in shares outstanding, which increases each remaining shareholder's proportional ownership and, all else equal, earnings per share. Buybacks are one of the two primary channels — alongside dividends — through which a company returns surplus cash to shareholders, and are generally considered more flexible than dividends because a buyback program can be scaled up, scaled down, or paused without the same negative signalling effect as a dividend cut.

Size Premium

The size premium is an additional premium sometimes added to cost of equity for smaller companies, reflecting the empirical observation that small-capitalization stocks have historically earned higher average returns than CAPM, using beta alone, would predict. The size premium is a supplemental adjustment layered on top of the standard CAPM cost of equity build, intended to capture size-related risk factors — such as lower liquidity, less diversified operations, and greater sensitivity to economic downturns — that a single-factor beta may not fully reflect. The size premium is a judgement input drawn from published size-premium studies, typically bucketed by market capitalization decile, and its use and magnitude should be explicitly disclosed given the range of views on its validity and persistence.

Sources and Uses (of Funds)

A sources and uses statement is the schedule in a project finance model that lists every source of funding for a transaction, senior debt, subordinated debt, sponsor equity, grants, and any other funding instrument, against every use of that funding, construction costs, capitalized interest during construction, reserve account funding, financing fees, and contingency. The two sides must reconcile to the same total with no unexplained balancing figure. It is typically the first schedule built in a project finance model and the one lenders review first, because it is the clearest single statement of how a transaction is actually funded and what that funding is spent on.

Structural Risk

Structural risk in the context of financial modelling is the risk of model failure arising from errors, inconsistencies, or weaknesses in the model's design, architecture, and internal logic — as distinct from the risk arising from incorrect input assumptions or adverse external outcomes. Structural risk exists within the model itself, regardless of the accuracy of the assumptions fed into it. A model with high structural risk will produce incorrect outputs even when its inputs are correct. This makes structural risk particularly dangerous: it cannot be remediated by revising assumptions or updating market data. It requires identifying and correcting the model's internal logic.

Stub Period

A stub period is a forecast period, most commonly the first period of a DCF forecast, that is shorter than a full year — for example, where a valuation date falls partway through a fiscal year and the first forecast period runs only from that date to the next fiscal year-end. A stub period requires two adjustments: the cash flow forecast for that period should be pro-rated (or independently forecast) to reflect only the partial period, and the discount factor applied to it must reflect its actual, shorter length rather than a full year. Failing to adjust either the cash flow or the discount factor for a stub period systematically misstates the present value of that period, and by extension, the total valuation. Stub periods interact directly with the mid-year convention, since a partial period's midpoint falls at a different point than a full year's midpoint.

Sum-of-the-Parts (SOTP) Valuation

Sum-of-the-Parts (SOTP) valuation is a technique for valuing a multi-segment or multi-asset business by valuing each distinct segment or asset separately — often using a segment-specific DCF, or a different valuation method suited to that segment's characteristics — and then summing the resulting values, with adjustments for shared corporate costs, net debt, and other consolidated items. SOTP is used where a single, consolidated DCF for the whole business would obscure meaningful differences between segments, such as different growth rates, risk profiles, discount rates, or capital structures. Because different segments can warrant materially different discount rates and terminal growth assumptions, applying a single blended discount rate across a diversified business, as a consolidated DCF implicitly does, can significantly misstate the value of one or more segments.

Supervised vs. Unsupervised Learning

Supervised and unsupervised learning are the two principal machine learning training approaches. Supervised learning trains a model on historical data paired with a known, labelled outcome, well suited to forecasting and credit scoring where past outcomes are recorded. Unsupervised learning identifies structure or groupings in data without labelled outcomes, well suited to anomaly detection and segmentation where no predefined labels exist.

Switch Cell

A switch cell is a dedicated input cell in a financial model whose value controls which set of assumptions, which scenario, or which modelling approach is active in the model at any given time. Formulas throughout the model reference the switch cell and use conditional logic to select the appropriate calculation or assumption based on its value. A switch cell allows the model to operate in multiple modes without requiring the user to manually edit formulas or change individual assumption cells. By changing a single input, the model's entire output changes to reflect the selected mode.

Synergies

Synergies are the cost savings or revenue benefits a combined entity is expected to achieve that neither the acquirer nor the target could achieve standalone — eliminating a duplicated corporate function, negotiating better procurement terms at greater combined scale, or cross-selling one company's products through the other's customer base. In a merger model, synergies should be traced to specific, named drivers and phased in over a stated, realistic timeline rather than entered as a single aggregate addition to combined EBITDA, since an untraceable synergy figure is one of the most common ways a deal's headline accretion is overstated.

TCFD

TCFD, the Task Force on Climate-related Financial Disclosures, is a widely adopted framework structuring how an entity discloses climate-related risk across four pillars, governance, strategy, risk management, and metrics and targets. It underpins much of current climate risk disclosure practice, including the scenario-based approach applied in portfolio-level climate risk financial modelling.

Tail Ratio

The tail ratio in project finance is the ratio of the project's remaining economic life (or remaining concession period) after the scheduled debt maturity date to the total loan tenor. It quantifies how much project life — and therefore cash-generating potential — remains after the debt has been fully repaid. The tail ratio is commonly expressed as: A tail ratio of 0.20x (or 20%) on a 20-year loan means the project has 4 years of additional life after the debt is repaid. A tail ratio of 0x means the project ends exactly at debt maturity with no buffer. Some lenders and practitioners define the tail in absolute terms (number of years of remaining project life after debt maturity) rather than as a ratio.

Take-or-Pay Contract

A take-or-pay contract is a common structure in hyperscale and larger colocation agreements under which the tenant is obligated to pay for its contracted capacity, whether measured in power, space, or both, regardless of whether it fully utilises that capacity during the contract term. This structure gives the operator a revenue floor independent of the tenant's actual utilisation pattern, which is particularly important during phased migrations or ramp-up periods when contracted capacity can materially exceed currently utilised capacity.

Tax Shield

A tax shield is the reduction in a company's tax liability that results from a tax-deductible expense. The most commonly referenced tax shield in corporate finance is the debt (interest) tax shield — the tax saving generated because interest expense on debt is deductible before calculating taxable income, unlike dividends or the notional cost of equity capital, which are not deductible. The debt tax shield is calculated as interest expense multiplied by the marginal tax rate and represents a real cash benefit to a levered company relative to an otherwise identical unlevered one. Other deductible expenses, such as depreciation, also generate tax shields. The debt tax shield is central to the Adjusted Present Value (APV) method, which values it as a separate, explicit component of firm value rather than folding it into a blended WACC-based discount rate.

Taxonomy Alignment

Taxonomy alignment measures whether an economic activity meets a defined green or sustainable taxonomy's technical screening criteria, a formal, codified eligibility standard rather than a general environmental claim. It has become the common reference point underpinning green bond eligibility, green asset ratio reporting, and increasingly sustainable finance disclosure more broadly, even for instruments that are not use-of-proceeds restricted.

Terminal Value

Terminal value (TV) is the estimated value, at the end of a financial model's explicit forecast period, of all cash flows that the asset or business is expected to generate beyond that period. In a discounted cash flow (DCF) analysis, the terminal value represents the present value of the perpetuity of cash flows from the terminal period onwards, discounted back to the valuation date. Terminal value is the single largest component of total enterprise value in most DCF analyses. It is typically significant because a business or asset's cash flow-generating life extends far beyond a practical explicit forecast period of 5 to 10 years.

Three-Stage DCF

A three-stage DCF is a DCF structure consisting of three distinct forecast stages: an initial high-growth explicit forecast period, an intermediate fade period during which growth and margin assumptions converge gradually, and a final terminal stage in which cash flow is capitalized into perpetuity at a stable, long-run growth rate. It is used for companies expected to gradually mature — where above-market growth or an elevated margin is expected to persist for some years before eroding toward an industry-normal, sustainable level, rather than normalizing abruptly. The three-stage structure avoids the discontinuity risk inherent in a two-stage DCF that jumps directly from an elevated explicit-period assumption to a materially different terminal assumption.

Three-Statement Model

A three-statement model is a financial model in which the income statement, balance sheet, and cash flow statement are dynamically linked into a single integrated system, so that a change in any assumption flows through correctly to all three, and the balance sheet balances in every forecast period as a direct consequence of that linkage rather than as a plug engineered to force it. It is the structural foundation most other financial models — DCF, LBO, project finance — are built on top of.

Toggle Cell

A toggle cell is a binary input cell in a financial model that switches a single feature, assumption, or calculation on or off. It accepts one of two values — typically 0 and 1, or True and False — and formulas throughout the model reference the toggle cell to determine whether to include or exclude a specific element. The toggle cell is a specific implementation of the switch cell concept, restricted to two states. Where a switch cell may have three or more states representing different scenarios or modes, a toggle cell has exactly two: active or inactive.

Transition Risk

Transition risk is the financial risk an entity or asset carries from adapting to policy, regulatory, and market shifts as an economy moves toward a lower-carbon state, carbon pricing, changing demand for carbon-intensive products, and stranded asset risk among its principal channels. It is distinct from physical climate risk, which arises from direct exposure to climate hazards rather than from the economic transition itself.