What is mark to market, and why does it matter?
Short Answer: Mark to market (MTM) means updating the value of an asset, liability or trading position using current market conditions. It shows how value has changed since purchase or a previous valuation. For traders, MTM helps explain open profits and losses, account equity and, for certain instruments, daily cash settlements.
Key Takeaways
- MTM reflects current market conditions rather than keeping a position at its original purchase value.
- A mark-to-market gain is a favourable valuation change; whether it creates a cash payment depends on the instrument.
- Fair value is a broader valuation concept, while MTM commonly refers to revaluation using market prices.
- Calculations depend on position direction, quantity, contract specifications and the reference price.
- MTM losses can reduce account equity and available margin before a trade is closed.
What Is Mark-to-Market?
Mark-to-market is the process of revaluing a position at a specified time using an appropriate current market price. That price may be a live quotation, an official settlement price or another market-based reference.
Imagine buying 20 shares at $50 each. Your original investment is $1,000. If the relevant market price rises to $54, their marked value becomes $1,080. The $80 difference is a gain before costs, even if you still own the shares.
This distinction helps separate what you paid from what the position is currently worth.
How the pricing logic works
An MTM figure is only meaningful when you understand the price behind it.
A platform may value a long position using the bid price because that is the quoted price available to sell. A short position may be valued using the ask price because closing it requires buying. Other valuations use midpoint prices or official settlement prices.
These choices explain why a chart price and your displayed profit can differ. Charts may show a different side of the quote, while the spread affects the price available to close your position.
A valuation is also a snapshot. It does not guarantee execution at that exact price, particularly when prices move quickly or market liquidity is limited.
Where MTM is useful—and where it falls short
MTM is useful for monitoring actively traded positions, comparing current exposures and assessing whether account equity can support existing trades.
It is less reliable as a simple price lookup when an asset rarely trades or its latest quotation is stale. In those situations, valuation may require comparable instruments or a model using current market assumptions.
MTM also does not answer whether an investment is attractive over the long term. It measures current value; it does not forecast future returns.
For leveraged trading, however, dismissing MTM as a temporary fluctuation can be costly. A position may require additional funding or face closure before a hoped-for recovery occurs.
What Is Mark-to-Market Gain?
A mark-to-market gain is a favourable change in a position’s valuation relative to its entry value or a previous valuation. Long positions generally gain when prices rise, while short positions generally gain when prices fall.
The comparison period matters. A position can show a gain today while remaining below its original purchase price.
Suppose you buy an asset at $100. Yesterday it was valued at $90, and today it is worth $94. You have a $4 gain since yesterday but a $6 loss since purchase, per unit.
Unrealised gains versus cash settlement
For many open investments and retail CFD positions, a positive valuation change appears as unrealised, or floating, profit. The figure can change until the position is closed.
Futures work differently. Daily mark-to-market settlement transfers gains and losses through cash credits and debits, even while the contract remains open. CME Group describes daily MTM as a defining feature of futures markets.
Therefore, “MTM gain” does not always mean “profit that exists only on paper.” Its practical effect depends on the product’s settlement arrangements.
Why a gain may differ from your net result
A price-based gain does not necessarily include every trading cost. Commissions, financing charges and currency conversion can affect the final result.
For example, a $120 gross gain becomes $105 after $15 in applicable costs. Platforms may show some charges separately, so the floating profit field alone may not represent your total net performance.
For accounting purposes, where a valuation change is reported also depends on the instrument and the applicable accounting treatment. A trading screen’s MTM figure should not automatically be treated as an accounting profit figure.
Is MTM the Same as Fair Value?
MTM and fair value are closely related, but they are not exact synonyms. Fair value describes a measurement objective; mark-to-market commonly describes updating a valuation using market prices.
Fair value reflects the price available in an orderly transaction between market participants at the measurement date. For an actively traded asset, a relevant quoted market price can provide direct evidence of fair value.
Where a suitable quoted price is unavailable, fair value may instead require valuation techniques using comparable transactions, expected cash flows or other inputs. This is often described as marking to model.
Concept | Main basis | Practical use | Main limitation |
Mark-to-market | Current market quotations or settlement prices | Updating trading valuations and monitoring exposure | Depends on the quality and relevance of prices |
Fair value | Current market-participant assumptions | Measuring an asset or liability’s current exchange value | May require significant estimation |
Historical cost | Original transaction cost, with applicable adjustments | Tracking recorded acquisition cost | May differ substantially from current market value |
Mark-to-model | A valuation model and its inputs | Valuing instruments without directly usable quotations | Sensitive to assumptions and model design |
Does market volatility make MTM misleading?
A volatile valuation can still accurately reflect changed market conditions. The concern is whether the chosen price represents a relevant, usable market observation.
A stale quote or an isolated distressed transaction may need further assessment. Equally, replacing an unfavourable market price with an optimistic estimate does not automatically produce a better valuation.
For traders, the practical response is to check the price source, timestamp and spread. MTM is most useful when its assumptions are visible.
How Do You Calculate Mark-to-Market?
For a simple long holding, multiply the current market price by the number of units to calculate its marked value. To calculate price-based profit or loss, compare the current price with the relevant reference price and multiply by the quantity held.
All examples below use hypothetical prices and exclude costs unless stated otherwise.
Basic MTM formulas
For an owned asset:
Current marked value = Current price × Quantity
For a simple long position:
MTM profit or loss = (Current price − Reference price) × Quantity
For a simple short position:
MTM profit or loss = (Reference price − Current price) × Quantity
Here, quantity means the number of units, such as shares. Use the entry price to calculate the price-based gain or loss since opening, or the previous valuation price to calculate the change since that valuation.
The current price should match the valuation basis used by your platform, such as the bid, ask or official settlement price.
For a futures position carried over from the previous trading day, daily MTM settlement compares the current settlement price with the previous settlement price. For a position opened that day and still open at settlement, the comparison starts from its trade price.
These formulas suit instruments with a linear price relationship. Some derivatives require additional valuation methods.
How MTM affects account equity
In a simplified retail forex or CFD account, assuming no credits or other adjustments:
Equity = Account balance + Floating profit or loss
A $2,000 balance with a $300 floating loss gives equity of $1,700.
Free margin = Equity − Used margin
If used margin is $500, free margin is $1,200.
Leverage does not change the profit per price point for a fixed position size. It allows greater exposure relative to deposited funds, making valuation changes potentially larger relative to account equity.
FAQs
Is mark-to-market a trading fee?
No. MTM is a valuation process, not a charge. Fees and financing costs are separate, although they can affect the net result shown on your account.
Can an MTM loss matter before I close a trade?
Yes. A floating loss can reduce equity and available margin. Depending on the product and account terms, this can lead to additional funding requirements or automatic position closure.
How often is mark-to-market calculated?
It depends on the instrument and purpose. Trading platforms may update valuations as quotations change, while reporting valuations use specified measurement times. Futures also use official daily settlement prices.
Is an MTM gain available to withdraw?
Not necessarily. Withdrawal availability depends on settlement, margin requirements and account terms. A positive floating result should not automatically be treated as unrestricted cash.
Why does my calculation differ from the platform?
Common reasons include using the wrong bid or ask price, contract size, reference period or conversion rate. Charges may also appear separately or already be included. Compare the calculation inputs before assuming the displayed result is incorrect.
By John Gordon, Market Analyst at NordFX
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