What it means
A listed share with frequent trades has an observable price, whereas an unusual long-term derivative or privately held instrument may not. In that case a company may estimate fair value from future cash flows, discount rates, volatility, comparable transactions and other inputs, which is the practical meaning of marking to model.
International Financial Reporting Standard 13 sets a fair-value measurement framework and a hierarchy of inputs, with observable inputs receiving priority where available and significant unobservable inputs leading to a Level 3 measurement. A model can use both kinds of data, so calling something mark-to-model does not automatically mean every input is imaginary, and it does not excuse ignoring relevant transactions.
The risk is that small changes in assumptions can move the estimate substantially: a higher discount rate lowers the value of future cash flows, while a different forecast of defaults changes a credit instrument's worth. Owners should ask for sensitivity ranges, independent checks and the reason the chosen assumptions reflect market participants rather than management's preferred outcome.
Mark-to-model and mark-to-market are useful contrasts, but neither is a complete description of the rules. Even an observed quote may need adjustment if the market is inactive or the quoted item differs from what is held, and conversely a model should use market evidence wherever it exists.
The goal is a defensible fair-value estimate under the applicable reporting framework. For a business using these values in borrowing covenants, bonuses or sale talks, governance matters as much as arithmetic.
Who chooses the inputs, who challenges them, and how are changes documented from one reporting date to the next? A model that rewards the same team that sets its assumptions needs especially strong independent review.
Liquidity is the final reality check, since if no buyer exists at the reported number, turning the value into cash may take time or require a discount. A board should separate accounting fair value, stressed exit value and money available now for payroll or debt service.
The model must also be tested against outcomes. When positions mature or sell, compare realised proceeds with prior estimates and investigate persistent bias.
Better calibration is possible only when errors are recorded rather than explained away each quarter.
In practice
Real-world examples.
Example
An investment fund holds a private loan that rarely trades. It forecasts repayments and discounts them using market-based credit assumptions, then reports a range around the modelled fair value.
Example
A company changes its assumed default rate and the fair value of a structured instrument falls sharply. Its audit committee asks whether new evidence justifies the change and how sensitive the earlier result was.
Example
A lender offers to buy an illiquid holding below the reported model value. Management distinguishes a distressed immediate exit from a fair-value estimate and records both for its liquidity plan.
Formula
Calculation
Illustrative discounted-cash-flow model: estimated value = sum of expected future cash flows discounted at a rate reflecting time and risk. The actual method may instead use an option model or comparable transactions. Report key inputs and sensitivity, not only the final point estimate.
Worked example. An invented contract is expected to pay $100,000 a year for three years, discounted at 10%.
- Value = $100,000 / 1.10 + $100,000 / 1.21 + $100,000 / 1.331 = $90,909 + $82,645 + $75,131 = $248,685.
- At a 12% rate the same cash flows give $89,286 + $79,719 + $71,178 = $240,183, so a two-point rise in the rate lowers the estimate by about $8,500, or roughly 3.4%. That sensitivity is what a reader should see alongside the point estimate.Case study
Seen in the real world.
Fictional example: Quayline Energy, a fictional power developer, held a private contract whose value depended on electricity prices over ten years. With no regular trade in comparable contracts, its finance team used a model built from price curves, delivery volumes and a discount rate. The model produced a value that helped satisfy a bank covenant. A new risk officer tested lower power prices and delayed delivery, revealing a wide range of possible outcomes.
She also commissioned an independent valuation and documented why one observable market curve had been adjusted. The board kept the accounting estimate but reserved more cash rather than assuming the position could be sold at that value tomorrow. When part of the contract later settled, the team compared actual proceeds with its earlier range. The lesson was to use a model as a disciplined estimate with controls and liquidity planning, not as a substitute for market evidence.
Watch out
Common mistakes.
- Treating a model value as a guaranteed cash exit price for an illiquid asset.
- Choosing favourable unobservable assumptions without independent challenge or sensitivity analysis.
- Ignoring available market evidence merely because a complex model is easier to control.
Questions
People also ask.
Is mark-to-model the same as Level 3 fair value?
Not exactly. A model can use observable inputs. Level 3 concerns measurements with significant unobservable inputs under the relevant reporting framework.
Why not use the latest trade price?
A comparable active-market price should inform the estimate. But an unusual or illiquid asset may lack a directly usable price, requiring a supported model and adjustments.
What should a board request?
Key assumptions, sensitivity ranges, observable evidence, independent review, and a separate estimate of how quickly the position could be turned into cash.
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