> Disclosure: This article contains an Interactive Brokers referral link. If you open an IBKR account through it, we may receive a referral commission at no extra cost to you. The editorial take below is not sponsored — IBKR did not review or approve this article, and the analysis is based purely on public IBKR documentation and the IBKR Campus learning center.
Open an option chain on a thin contract and you will hit a familiar problem: the bid is at one price, the ask is far away, and neither side feels like a real market you should hit. Interactive Brokers' Synthetic Price column is designed for exactly that situation — a continuously updated theoretical reference that sits next to the live quote inside IBKR Desktop's option chain so traders have something to anchor against when the visible book is unreliable.
This article is a conceptual explainer based on public Interactive Brokers documentation and the IBKR Campus learning center. It covers what Synthetic Price represents, how to read it alongside bid/ask, when it earns its place in the workflow, where it can mislead you, and how to combine it with liquidity signals before placing an order. For UI specifics, always cross-check against your installed IBKR Desktop release — IBKR iterates the platform frequently and column wording or location can shift between builds.
If you have not set up an IBKR account yet, start with IBKR Account Setup: Application to First Trade (2026). If you are still choosing between Interactive Brokers' two flagship desktop platforms, IBKR Desktop vs TWS is the comparison guide that pairs with this one.
What Synthetic Price represents
According to Interactive Brokers' published platform documentation (Interactive Brokers — IBKR Desktop, IBKR Campus learning center), the Synthetic Price column estimates a theoretical option value using a fixed set of inputs:
- the underlying asset price
- prevailing interest rates (the carry assumption)
- dividend estimates, where applicable
- the option's right (call or put)
- the strike price
- the time to expiration
- a volatility estimate
The crucial point: Interactive Brokers is not promising the option will *execute* at that number. It is providing a model-based reference for what the option *should* be worth given the inputs above. That distinction — model reference vs. tradable price — is the whole reason the column has utility, and the whole reason it can mislead a trader who confuses the two.
Why illiquid options break the "trust the quote" instinct
In tight, active contracts on liquid mega-cap names, the visible bid/ask is usually a fair guide. The midpoint is close to fair value, the spread is narrow, and contracts trade frequently enough that displayed quotes refresh quickly.
Illiquid contracts behave differently. Common pathologies:
- Wide spreads. The displayed market spans a meaningful portion of the contract's price.
- Stale quotes. One side of the book has not refreshed for minutes — sometimes longer.
- Thin size. Only a small quantity is offered on either side.
- Low daily volume. Few contracts have actually changed hands today.
- Odd strikes or expiries. Far-dated and far-out-of-the-money contracts may *display* a price while offering brutal execution if you actually try to lift it.
Reading Synthetic Price alongside bid and ask
Treat Synthetic Price as one input in a comparison, not as a target. Three numbers matter when sizing up a contract:
| Field | What it tells you |
|---|---|
| Bid | What buyers are willing to pay right now |
| Synthetic Price | What the model thinks the option is worth |
| Ask | What sellers are willing to accept right now |
- Synthetic near the midpoint, narrow spread. A normal market — limit orders near the mid are reasonable, and the column is mostly confirmatory.
- Synthetic close to the bid, ask far above. The ask is likely stretched or stale. Working a limit order near Synthetic Price (or just above it) is more rational than chasing the ask.
- Synthetic far above the bid, near the ask. The bid side is the suspect. A patient seller may need to wait for the book to firm up rather than crossing the spread immediately.
When the column earns its place
1. Wide-spread single-leg options
The clearest use case. When the displayed market is too noisy to trust, any defensible model reference is better than averaging two potentially broken quotes. The wider the spread relative to the contract's price, the more value the column adds.
2. Farther-dated contracts
Longer-dated options are often genuinely tradeable but display poorly because order books are sparser the further out you go. A model-based estimate stays more stable than a sparsely refreshed ask, and gives you a fairer anchor when picking among LEAPS or 60–90 day expiries on a less-traded name.
3. Outside regular trading hours
Per Interactive Brokers' documentation, the column populates before and after the cash session. That helps you stage limit levels for the next session, compare strikes overnight, or review candidates after the close — without reacting to a frozen book that has not seen a real trade in hours.
4. Comparing nearby strikes or expiries
If two candidates both look thin, Synthetic Price helps you judge which one is trading closer to a defensible market and which one is carrying more quote noise. That is useful when constructing verticals, choosing among adjacent expiries, or rolling a position to the next month.
5. Sanity-checking aggressive single-side quotes
Sometimes a single market maker has stepped away and the remaining quote is essentially decorative. Synthetic Price serves as the second opinion that flags the situation before you act on a quote that nobody would honour at meaningful size.
What Synthetic Price is *not*
Useful tools are easy to overrate. Synthetic Price is not:
- a guaranteed executable price
- a substitute for liquidity analysis
- a forecast of where the next trade will print
- a reason to ignore volatility shifts or event risk
- a replacement for understanding *why* the spread is wide in the first place
A trader who treats Synthetic Price as "the real price" will still get bad fills. A trader who treats it as one input among several — bid, ask, Synthetic Price, volume, open interest, spread width, and the broader regime — captures the benefit without falling into the trap.
Where to find the column in IBKR Desktop
The column lives inside the option-chain column configuration in IBKR Desktop — the same configuration panel used for Bid, Ask, Volume, Open Interest, and the Greeks.
> Note: The exact menu wording and click path can vary between IBKR Desktop releases. The IBKR Campus learning center maintains current option-chain lessons that match the live UI; verify against your installed version before relying on a static external guide.
The high-level location is consistent across recent IBKR Desktop builds:
- open the option chain inside an IBKR Desktop quote workspace
- open the chain's column / layout configuration
- locate Synthetic Price in the available-columns list under the options section
- add it to your visible columns and save the layout
A practical workflow for fairer entries
A cleaner process than "open the chain, click ask, hope":
1. Narrow the chain to the strikes and expiries you care about
Use the standard IBKR Desktop option chain. Filter by the moneyness band and tenor that match your trade idea. The fewer irrelevant rows you have to scan, the easier it is to spot the contract that actually deserves attention.
2. Add the columns that support the decision
For this workflow, the useful set is bid, ask, Synthetic Price, volume, open interest, and implied volatility (if relevant to your style). Save the layout so you do not rebuild it every session.
3. Eliminate obviously poor candidates
Skip contracts with very wide spreads relative to price, tiny open interest, almost no quoted size, or weak trading activity — unless you have a specific reason to engage anyway. The column does not turn an unliquid contract into a liquid one; it only sharpens the picture for the contracts that are realistically tradable.
4. Use Synthetic Price as the anchor for a limit-order idea
Rather than blindly hitting the ask, work a limit somewhere between Synthetic Price and the visible ask, biased toward Synthetic when the spread is wide and biased toward the visible market when the spread is tight. The exact starting price is a judgement call; the principle is to anchor on the model number rather than the worst displayed quote.
5. Decide whether the trade is still worth it after fills
Sometimes the right answer is to skip. If the model value looks acceptable but the live market refuses to come closer to it, the edge may be weaker than the chart suggested. Walking away from a poorly priced book is a perfectly reasonable outcome of running this workflow.
Synthetic Price vs. midpoint: which to trust
In tight, active contracts, the midpoint of the bid/ask is often enough — fair value, executed prices, and the midpoint cluster together, and there is little reason to overcomplicate the decision.
In wider or distorted chains, Synthetic Price is generally the better reference because it incorporates option-pricing inputs (underlying, rates, dividends, time, volatility) rather than averaging two potentially bad quotes. Averaging a stale 0.40 bid with a stale 1.10 ask gives you a midpoint of 0.75 that may have nothing to do with where the contract should actually trade.
A practical rule of thumb:
| Market state | Better anchor |
|---|---|
| Tight, active markets | Midpoint usually works well |
| Wide, noisy markets | Synthetic Price is often the better anchor |
| Very weak liquidity | Use both — and seriously question whether to trade at all |
Does this replace a proper options pricing model?
For most retail users inside IBKR Desktop, this column is the practical built-in version of that need. The model encodes the standard option-pricing drivers — underlying movement, time to expiration, implied volatility, rates, and dividends — so you do not have to maintain your own pricing sheet just to improve trade selection inside the chain.
You still benefit from understanding *why* those drivers matter. A trader who knows that vega rises with longer-dated options will be less surprised when Synthetic Price moves around as implied vol shifts. A trader who knows about dividend risk on calls will see why the model adjusts ahead of an ex-dividend date. The column does not eliminate the need to learn options; it just removes a layer of friction for traders who already understand the basics.
You do not need a custom spreadsheet or a separate pricing terminal to get a faster in-platform estimate. That is the real value-add for the typical IBKR Desktop options user.
Should beginners use this feature?
Yes — with the right expectations.
Beginners often make one of two mistakes in options:
- they trust the quoted ask too much
- they overcomplicate pricing and avoid useful tools
If you are unsure whether your account even has the right market data feed to see a valid options quote in the first place, Interactive Brokers Market Data Subscription: Which One Do You Actually Need? is the prerequisite read. Once you are happy with a contract, Interactive Brokers Bracket Order: How to Set Stop Loss and Take Profit on TWS covers attaching protective exits before you walk away from the screen.
Common pitfalls
A few habits to watch for once the column is enabled:
- Treating it as a price target. It is a reference, not a forecast.
- Ignoring spread width. A reasonable theoretical value inside a very wide market can still produce a poor fill.
- Forgetting size. Fair value for one contract does not scale linearly when you need ten.
- Anchoring during fast tape. Around earnings or macro releases, the live market can move ahead of the model in ways that make the column trail reality.
- Skipping liquidity checks. Volume and open interest still matter even when the synthetic number looks clean.
- Confusing it with executed trades. It is not the last trade and it is not a guaranteed fill.
FAQ
Is Synthetic Price the same as the option's last traded price?
No. The last trade is a historical fact — a real transaction that already happened, possibly hours ago in a thin contract. Synthetic Price is a continuously updated model estimate that exists whether the contract has traded today or not. The two answer different questions: last trade tells you what happened; Synthetic Price tells you what the model thinks should happen now.
Does Synthetic Price guarantee my order will fill there?
No. The column is a theoretical reference based on option-pricing inputs. Whether a market maker is willing to trade at or near that level depends on liquidity, your size, the volatility regime, and event risk — none of which the column promises. Treat it as a starting point for a limit order, not a confirmation that the order will fill.
Why does Synthetic Price sometimes sit outside the bid/ask?
Usually because one side of the displayed quote is stale, thin, or aggressively widened. That is exactly when the column adds the most value — it flags that the visible market is not a clean signal, and that crossing it would mean transacting against a quote no rational counterparty would honour at meaningful size.
Can I rely on Synthetic Price during earnings?
Be cautious. Around earnings or major macro events, implied volatility and the underlying can move faster than the model's inputs settle, and market makers widen spreads on purpose to compensate for the uncertainty. Treat the column as a *slower* reference during fast tape, and lean more heavily on actual quote behaviour and recent prints.
Where do I find the official IBKR documentation for this column?
The column is documented within IBKR Desktop's product pages and the option-chain lessons in the IBKR Campus learning center. Always verify against the current version on interactivebrokers.com and ibkrcampus.com — column behaviour, calculation inputs, and availability can change between platform releases, and an external article is only ever a snapshot.
Is the column available on TWS as well as IBKR Desktop?
This explainer focuses on IBKR Desktop. The two platforms share a lot of underlying infrastructure but their option-chain UIs differ in important ways. If you are deciding between the two, see IBKR Desktop vs TWS: Which Interactive Brokers Platform Should You Use? (2026 Guide) for the side-by-side comparison and pick the one that matches your workflow before investing time in custom layouts.
Final verdict
The Synthetic Price column is worth turning on. It is a quality-of-life upgrade for anyone trading options in chains where displayed quotes are noisy, wide, or thin. The column does not turn an illiquid contract into a liquid one, and it will not save a trader who treats theoretical value as a guaranteed fill — but used as one input among bid, ask, volume, open interest, and spread width, it tightens trade selection and improves limit-order discipline.Treat it the way you would treat any other model output: useful when its assumptions hold, weaker when the live market is fundamentally broken, and never a substitute for the trader's own judgement about whether a contract is worth engaging with at all. Add it to your saved option-chain layout, build the habit of comparing it against bid/ask and liquidity signals, and let it quietly upgrade your fills over hundreds of trades rather than dramatically transform any single one.
If you do not yet have an IBKR account and want to follow this workflow inside IBKR Desktop, you can open one through our Interactive Brokers referral link in the front matter — the steps from application to first trade are covered in the IBKR Account Setup guide, and the disclosure at the top of this article applies: we may earn a referral commission, the editorial take is independent, and IBKR did not sponsor this piece.