The Margin Call, Explained

MAX LOSS — the worst possible ending $23,377 per contract here

The most the trade can EVER cost if you hold to the end. Carved into the strikes on day one.

In a crash: never moves. The broker completely ignores it.

MARGIN REQUIREMENT — the broker's deposit $7,917 per contract today — IBKR's own number

What IBKR demands you set aside, recomputed every minute: the worst loss in a price wiggle from wherever the price is now. The wiggle width is IBKR's choice per product (measured: ±10-11% on index ETFs, ±16-19% on single stocks, ±27-34% on crypto names). This page's model calibrates its width per structure so its today-number equals IBKR's real answer exactly (the same $87.1k @ 11 ct on the dashboard card), then extends it to every crash depth, which the real engine cannot be asked to do.

In a crash: it SHRINKS. Yes, really.

NLV — your actual money $257,147 in this example

Your account value, marked to market, live.

In a crash: falls hard. The only number that truly collapses.

2 · Watch the race — drag it both ways

market 0%

±$0 · 0%

your money –

broker wants –

breathing room –

Blue = your money (NLV). Orange = the broker's requirement. Green = breathing room. Drag left into the crash zone (the ghosts of 2022, COVID, 2008 and dot-com are marked), right into a rally — or click any underlined mark (a ghost, a +15/+25/+40/+75 preset, any axis %) to jump straight there. Same market, same structure — only the size changes: 11 ct never crosses (worst case fits in cash), 16 ct is called at −55%, 20 ct at −20%, an ordinary correction. Nobody has ever been margin-called by a rally: dragging right, the requirement crawls while your money runs. Upside shown is the 3-leg structure only (income calls are rolled out of the way, per doctrine).

3 · Why does the broker's deposit SHRINK in a crash?

Because the deposit only ever covers a fixed-percentage wiggle from today's price (±11% here, IBKR's own width for QQQ). After a 40% crash, that wiggle on a much smaller price is far fewer dollars, and your options have gone so deep in (or out of) the money that a wiggle barely changes their value. Watch the orange line: $7,917 → $3,271 at −20% → pocket change by −40%. The requirement is not what kills you. Your own equity falling faster than it is.

4 · The rule that makes a margin call impossible

If the worst possible ending fits inside what you hold, your equity line mathematically cannot dive under the requirement line — verified on these curves all the way to −95%. That is why 11 contracts (Max Loss $257k on a $257k slice) shows NEVER, at any depth, forever. This is the dashboard's MAX ct NEVER column.

The one giant asterisk: who owns your insurance?
An owned hedge (a held LEAPS put) is paid once, up front, for the whole journey: no bills during the storm, and the rule above holds unconditionally.
A rented hedge (a near-term put re-bought ~5× a year) must be renewed mid-crisis, at crisis prices. In the slow 2022 bear, the same capped structure with rent due was margin-called purely by its own insurance bills ($108k of renewals), while the rent-free version survived. The rent is the liquidation mechanism.
This page's QQQ hedge is rented ($3,178 per contract per year), which is why the dashboard charges a full year of rent inside its max-safe count, and why a rented NEVER always wears the amber asterisk: NEVER*.

5 · How this maps to the dashboard panel

6 · What this picture does NOT know

Panel column	In this page's words
liq at	where the lines cross at your CURRENT size (NEVER* if they don't, amber because rented)
MAX ct NEVER	the biggest size where they can never cross — rent already charged inside
@1.3x / @1.5x	the guide's index ceilings: lever past ML=cash and the crossing point walks toward you
slow-bear rent check	your crossing depth after pre-paying a year of insurance renewals
BOOK line	the same race with every ticker falling together, one shared pot of money

It crashes everything instantly, today. It does not model a multi-year grind (rent beyond 12 months), the broker raising requirements by hand in a panic, or crypto falling 2× the index. The margin numbers here start from IBKR's real whatIf answer (the dashboard's "Maint. Margin (IBKR)" card, $87.1k @ 11 ct here): the model's scan width is solved per structure so its today-number matches the broker's exactly, and only the crash-depth extension is model. Calibrated 2026-08-05 against IBKR's engine on 24 live structures: measured widths ran ±10-11% on SPY/QQQ, ±16-20% on AMZN/GLD, ±27-34% on COIN/IBIT (the crypto house add-on), and after calibration every structure's today-margin matches IBKR to the dollar. The depth-extension and the IBKR-can-raise-house-margin risk remain model territory. Final word before any trade: IBKR Risk Navigator, on live prices.

7 · Checking your own account

This page races one structure on one slice. IBKR's Risk Navigator draws the same race for a whole account: TWS → Risk Navigator → What-If portfolio, chart Beta weighted, Range 100%, Update. Each stock moves by its beta to the S&P, volatility held still. The account is safe to a given drop while the line's loss stays under NLV minus $100k: below ~$100k NLV the account leaves Portfolio Margin, the requirement stops shrinking, and the race above no longer applies. On 21 Oct 2026 that check put Neville's floor at about an 18.5% S&P drop and Main's near 28%; Joint and RetireInc held to −30%. Live verdict: the Desk's Repair tab; dated record: Crash Liquidation; method: the guide's 21 Oct addendum.