Read Term Structure

Compare volatility across maturities

Term Structure places implied volatility across expirations for the selected ATM or delta-band slice. It can include constant-maturity points and derived forward volatility. The tool is useful when the question is about maturity rather than strike. Open it in Volatility Analysis or Add Tool, then identify which slice and maturity convention are active before reading the curve's direction.

Choose the slice and timestamp

A fixed timestamp avoids mistaking an evolving quote set for a maturity comparison.

1. Select the underlying, session, trading date and valuation minute.
2. Choose the available ATM or delta-band mode.
3. Review the included expiration selection.
4. Hover listed-expiration points and read their IV values.
5. Inspect constant-maturity and forward-volatility values separately.
6. Match the same date/minute in Skew if you want to investigate a particular expiration.

Listed and derived maturities differ

A listed-expiration point summarizes eligible contracts for that date. A constant-maturity value creates a target-tenor comparison and need not correspond to one listed option. Forward volatility is derived from compatible neighboring inputs; it is not the option premium of a forward trade. A missing input can make a derived point unavailable even when one neighboring expiration is present. Do not bridge that gap with a guessed flat value.

Worked example: a near-term peak

Suppose the first listed expiration has higher IV than later dates. Inspect its exact maturity and the chosen ATM/delta band before calling the whole curve inverted. A nearby event or simply a different eligible input sample may require investigation, but the chart alone does not explain causation. Compare the relevant skew at the same minute, then check whether the constant-maturity series includes the same dates. Distinguish observed model outputs from an explanation you have not verified.

Troubleshoot absent forward or target-tenor values

Check whether enough compatible maturities and usable IV inputs exist. Changing the target or range cannot create a missing listed expiration. Historical preparation and source freshness apply to every underlying point. For support include slice, included expirations, selected minute and the particular derived field, plus its neighboring input values where displayed. A screenshot of the curve without maturity labels cannot identify an interpolation or eligibility issue.

Compare volatility on consistent assumptions

Implied volatility is inferred from eligible option inputs under a model; realized volatility summarizes an observed underlying-price sample. Neither is an executed underlying price or a guarantee about a future move. Expiration, strike or delta band, valuation time, calendar/trading-time convention and available quote coverage all matter. A blank or invalid IV solve should stay unavailable rather than being treated as zero volatility or replaced by an unrelated contract's value.

For comparisons, first align the underlying, trading date and session. Then match the relevant expiration or maturity convention and inspect dated source inputs. A quote snapshot delivered now can still contain older observations. A historical slider selection needs eligible historical inputs; the current chain cannot manufacture an earlier smile. Closed or partial sessions can have fewer usable points. When a curve looks unusual, inspect a specific node and neighboring inputs instead of inferring a broad market regime solely from a smooth line or a color change.

Use a maturity ladder without treating gaps as listed options

A target constant maturity can sit between listed expirations. Its derived IV is useful for comparing the same tenor across dates, but it should not be described as the quote of a contract that does not exist. Forward volatility also needs compatible inputs and maturity spacing; a missing or invalid neighbor can make the derived field unavailable. The dates and tenor construction matter as much as the vertical value when interpreting a sharp change.

A practical check records two neighboring listed-expiration points, the target-tenor result and the chosen ATM/delta-band convention at one fixed minute. Then inspect the relevant skew to understand which part of each expiration supplied the slice. Do not fill an absent neighbor with yesterday's value while keeping a current value on the other side: that mixes valuation times and can manufacture a false slope. A historical comparison should use eligible dated inputs throughout. For support, identify whether the disputed value is listed-expiration IV, constant-maturity IV or derived forward volatility so the correct calculation can be reproduced.