Glossary term
Mark-to-Market (MTM)
Mark-to-market is an accounting and valuation approach that records an asset or liability based on current market value rather than original cost.
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What Is Mark-to-Market (MTM)?
Mark-to-market, or MTM, is an accounting and valuation approach that records an asset or liability based on current market value rather than original cost. The idea is to show what something is worth under current market conditions, not just what was paid for it.
MTM is common in trading, derivatives, securities accounting, fund valuation, margining, and risk management. It can make financial statements and account values more current, but it can also introduce volatility when market prices move quickly.
Key Takeaways
- Mark-to-market values an asset or liability using current market prices or fair-value estimates.
- It differs from historical-cost accounting, which starts with the original purchase cost.
- MTM can make gains and losses visible sooner.
- It is important for trading portfolios, derivatives, margin accounts, and fund valuation.
- When markets are illiquid, estimating market value can become harder.
How Mark-to-Market Works
If an investment can be observed in an active market, the current market price may be used to update its value. If the market is less active, valuation models or other inputs may be needed. The result is a carrying value that reflects current conditions more than historical purchase price.
For investors, MTM can show unrealized gains and losses before anything is sold. For businesses, it can affect reported earnings, balance-sheet values, and risk disclosures.
MTM Versus Historical Cost
Method | General idea |
|---|---|
Mark-to-market | Value reflects current market price or fair value |
Historical cost | Value starts with original purchase cost |
Model value | Value depends on assumptions when market prices are not clear |
Why Mark-to-Market Matters
MTM matters because current value can differ sharply from original cost. A bond, stock, derivative, or commodity position can gain or lose value even before it is sold. Marking the position to market can make that change visible in account values or financial reporting.
That visibility can be useful, but it can also amplify stress when prices move quickly and investors or lenders respond to updated values.
Where MTM Can Get Difficult
Mark-to-market is more straightforward when there is a deep, active market. It is harder when the asset is illiquid, customized, complex, or rarely traded. In those cases, valuation may rely on models, comparable prices, or internal assumptions.
That is why investors should pay attention not only to the value reported, but also to how the value was determined.
The Bottom Line
Mark-to-market is a valuation approach that updates assets or liabilities to current market value. It can improve transparency, but it can also make reported values more volatile and harder to judge when markets are thin or stressed.