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Bitcoin held on one exchange generally cannot protect a leveraged position on another. Each venue calculates equity, collateral value, maintenance margin and liquidation actions inside the account and product that recognize them. A portfolio spreadsheet can show your combined exposure, but it does not transfer collateral or create a cross-exchange margin pool.
Assess risk by calculating headroom separately for every account, then stress-testing all accounts under the same BTC move, collateral haircuts, funding or interest charges and liquidity problems. Do not use one universal liquidation formula or assume that a displayed liquidation price applies to a portfolio-margin account.
The rule that determines your real exposure
Separate exchange accounts are separate risk containers unless the specific venue product explicitly pools the relevant collateral. Spot BTC on Exchange A is normally unavailable to satisfy a maintenance-margin call on a futures or borrowing account at Exchange B. A hedge can reduce economic exposure, but it does not necessarily prevent either account from being liquidated first.
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Bank for International Settlements Working Paper 1087 (2023) describes separately held spot and futures positions that can be liquidated before the hedge converges. The authors also report that crypto carry averaged above 10% annually in their analyzed data and could reach 60% per annum. Those figures describe a study of futures carry, not a liquidation probability or a forecast.
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The BIS authors warn that “Engaging in the latter is risky due to spikes in margins and liquidations amid drawdowns.” A falling BTC price can therefore damage both sides of your plan: a long futures position can lose value while BTC posted as collateral also declines.
Why a portfolio total is not a margin balance
A dashboard may add BTC, stablecoins, cash, unrealized profit and liabilities across venues. That is useful for monitoring net wealth and directional exposure, but a venue normally sees only the assets and positions in its own eligible wallet or account mode.
- Collateral recognition: An exchange may accept only specified assets, apply a collateral weight or haircut, impose an amount or concentration cap, and value the asset using a mark, index or other stated price.
- Position sharing: Cross margin may share eligible funds and positions within an account; isolated margin normally limits a position to an allocated amount; portfolio margin evaluates a broader set of exposures using the venue’s risk model.
- Timing: Moving BTC between venues takes time and may require withdrawals, confirmations, internal transfers, borrowing checks or account permissions. A transfer cannot be treated as available headroom until the receiving account recognizes it.
- Liquidation order: A venue may cancel orders, close positions, sell collateral, repay loans or perform other steps before or during liquidation. A hedge on another venue may remain open while one leg is closed.
Only net collateral that the actual account product explicitly shares should enter that account’s margin calculation. Everything else belongs in a separate portfolio-level risk report.
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The same position can have very different liquidation mechanics depending on its margin mode. Record the mode for each position and wallet rather than assuming the venue uses one rule everywhere.
| Mode | What generally shares risk | What to verify |
|---|---|---|
| Isolated margin | A specified margin allocation supports the position. | Whether additional funds can be added automatically, whether unrealized profit is reusable, and whether account-wide events can still reach isolated funds. |
| Cross margin | Eligible collateral and positions within the defined cross wallet or account. | Which assets are eligible, haircuts, caps, liability interest, maintenance tiers, and whether isolated balances are excluded or can be affected by an account-wide procedure. |
| Portfolio margin | The venue’s risk engine evaluates a portfolio of supported positions and collateral, often using stress scenarios. | Required product set, scenario parameters, concentration charges, valuation conventions, intervention thresholds and the fact that a fixed liquidation price may not exist. |
“Isolated” does not universally mean “untouchable.” Kraken’s Multi-M documentation, for example, distinguishes isolated-only liquidation, cross liquidation that preserves isolated funds, and account-wide liquidation; it warns that account-wide liquidation can put all collateral assets in that wallet at risk. Treat the documented procedure for your exact account as controlling.
Build an account-by-account inventory
Create one record for every exchange, legal entity, wallet type and margin mode. Capture a timestamp because prices, liabilities and risk parameters change continuously.
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- List collateral: Record asset, free quantity, locked quantity, deposit status and whether the venue recognizes it for this product.
- List positions: For each perpetual, future, option, margin loan or other derivative, record contract size, direction, entry price, mark price, leverage, unrealized profit or loss and maintenance-margin tier.
- List liabilities: Include borrowed principal, accrued interest, funding payments, trading fees and any other amount deducted from equity.
- Record allocation: Mark each position as isolated, cross or portfolio margin and identify the wallet or sub-account that can actually supply collateral.
- Capture controls: Note alert thresholds, auto-deleveraging or liquidation rules, order-cancellation behavior, collateral-sale order and repayment steps.
- Timestamp the snapshot: Store the venue’s valuation time and price source so that later comparisons do not mix stale and current figures.
Do not subtract the value of BTC at one venue from a liability at another when calculating either venue’s immediate maintenance headroom.
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Translate each venue’s rules into an equity and headroom calculation
There is no universal liquidation equation. Use the venue’s current documentation for the exact product, jurisdiction and account mode. A useful abstraction is:
recognized collateral = min(eligible quantity × valuation price × collateral weight, applicable asset or concentration cap)
account equity = recognized collateral + realized P&L + unrealized P&L − liabilities − accrued interest − funding − fees
headroom = account equity − maintenance-margin requirement
Some venues express risk as a ratio instead:
maintenance ratio = account equity ÷ maintenance requirement
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Use the venue’s definition of numerator and denominator. A ratio above 1 is not automatically safe: the intervention level may be higher, and portfolio-margin engines can use additional stress or concentration charges.
Collateral value is not necessarily market value
Coinbase Global Exchange documentation describes collateral value as market notional multiplied by a collateral weight, with haircuts and amount limits. A BTC balance can therefore contribute less than its displayed market price, and excess BTC above an allowed limit may contribute nothing to margin.
Maintenance margin is position- and tier-dependent
Maintenance requirements can rise with position size, leverage tier, product, volatility or concentration. Record the applicable tier for each position rather than applying the smallest published percentage to the entire account.
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Interest and funding reduce headroom
Borrowing interest, perpetual funding, conversion charges and liquidation fees can reduce equity even when the mark price is unchanged. Include accrued amounts in the snapshot and model additional charges during stress.
What current venue examples show
The following are documented product examples, not universal thresholds. Definitions and procedures can change, and eligibility may vary by jurisdiction or account.
| Venue and document date | Documented point | How to use it |
|---|---|---|
| Binance Portfolio Margin, updated 2026-01-13 | Liquidation occurs when uniMMR falls below 1.05 (105%); the documentation also describes controls at other ratio levels and liquidation from negative adjusted equity caused by exchange-rate movement. | Use the documented uniMMR calculation and controls for that portfolio-margin account; do not apply 105% to another product or venue. |
| Bybit Unified Trading Account, last updated 2026-08-07 | Portfolio-margin risk controls begin when MMR reaches 100%, with staged actions. The document says a fixed liquidation price cannot be accurately calculated or displayed for portfolio margin. | Monitor account-level MMR and staged controls instead of relying on a single price alert. |
| Coinbase Global Exchange | Collateral value uses market notional multiplied by collateral weight, with haircuts and amount limits; collateral liquidation may begin when portfolio margin falls below maintenance margin. | Apply the published weight and limit to each eligible asset and check the liquidation sequence. |
| Kraken Multi-M | Examples distinguish isolated-only, cross liquidation preserving isolated funds and account-wide liquidation. Account-wide liquidation can place all collateral assets in that wallet at risk. | Map your wallet and mode to the documented procedure; do not assume isolated balances are protected in every event. |
| Binance cross margin | Collateral ratios, liabilities and interest enter margin calculations; the documentation notes a haircut-calculation change effective 2026-06-15. | Use the rule version applicable to your calculation date and recalculate after parameter changes. |
Stress the accounts together, but calculate the damage separately
After computing current headroom for every account, run synchronized scenarios. State assumptions; a scenario is not a probability forecast.
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| Stress | Account-level effect to model | Portfolio question |
|---|---|---|
| BTC price decline | Lower collateral valuation, adverse P&L on long positions and possible tier changes. | Which account reaches its intervention threshold first? |
| Derivative move against the position | Unrealized loss consumes equity; a hedge on another venue does not immediately replenish this account. | What directional exposure remains if the losing leg is liquidated? |
| Haircut or collateral-cap change | Recognized collateral falls without a spot-price move. | How much headroom disappears if BTC weight is reduced or a cap is reached? |
| Funding, interest and fees | Liabilities grow and equity declines during the stress window. | Can the account remain above its threshold until a transfer or manual action settles? |
| Liquidity deterioration | Liquidation fills may be worse than the mark, increasing losses and fees. | Could closing one leg leave an unhedged position on another venue? |
| Venue or network interruption | Collateral transfer, order placement or account access may be delayed. | Is the planned remedy available without relying on an unverified transfer time? |
BIS analysis documents margin spikes and liquidations during drawdowns. Include a correlated shock in which BTC collateral falls at the same time that the leveraged position loses value; testing each variable independently can materially understate risk.
A worked illustration of why netting fails
The numbers below are fictional arithmetic to demonstrate the method, not exchange rules or a forecast.
- Account A: It recognizes $40,000 of BTC collateral after its stated haircut and cap. Its position has a $12,000 unrealized loss, $3,000 of liabilities and a $20,000 maintenance requirement. Equity is $25,000 and headroom is $5,000.
- Account B: It holds $30,000 of BTC at market value, but its product does not recognize that wallet as collateral for the position. The position has a $4,000 unrealized loss, $2,000 of liabilities and a $22,000 maintenance requirement. Its recognized collateral is $0, so its equity is negative $6,000 under this simplified illustration and it is already beyond the stated requirement.
- Portfolio view: Adding the two BTC balances may suggest $70,000 of assets, but that total does not repair Account B. The only valid immediate action is one that the venue accepts inside Account B, such as eligible collateral, a position reduction or repayment.
In a real calculation, replace every illustrative number with the venue’s mark or index price, collateral weight, cap, maintenance schedule, liabilities and liquidation procedure.
Track portfolio exposure without pretending collateral is portable
A monitoring sheet or dashboard should have two layers:
- Venue layer: One row per account containing recognized collateral, equity, maintenance requirement, ratio, headroom, nearest alert threshold and liquidation state.
- Portfolio layer: Combined BTC quantity, net delta, gross notional, borrowing, funding and interest, transfer locations, and the effect of a hedge failing after one leg is closed.
Color-code the venue layer by distance to its own intervention threshold, not by the portfolio’s average leverage. Keep an audit column for rule version, document date, valuation price and last refresh. When an exchange changes a haircut, threshold or liquidation sequence, update that account’s row and rerun every scenario.
Operational risks that a spreadsheet can hide
Transfers are not instant collateral
Do not promise yourself a specific transfer time unless it is verified for the exact route, asset, network, account and current conditions. Treat an in-transit balance as unavailable until the receiving venue credits and recognizes it.
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A hedge can be closed after the other leg
If a short futures position is liquidated while spot BTC remains elsewhere, the portfolio can become long. Model the residual position after each possible liquidation order.
Access and permissions can fail
Withdrawal holds, maintenance windows, authentication problems, risk limits and network congestion can prevent a planned top-up. Maintain a venue-specific response that does not depend on moving funds at the last moment.
Automatic actions can change the result
Order cancellation, auto-repayment, collateral sales, staged deleveraging and insurance or socialized-loss mechanisms differ by venue. Read the exact sequence and include fees and slippage assumptions in stress results.
How much collateral is enough?
There is no safe universal BTC amount. The required amount depends on position size and direction, recognized collateral weights, maintenance tiers, liabilities, funding, concentration limits, stress magnitude and the time needed to act.
For each account, choose a scenario loss and operating buffer, then solve for the recognized collateral needed to remain above that account’s intervention threshold:
required recognized collateral = maintenance requirement + projected stress loss + projected charges + operational buffer
Convert that result back to BTC only after applying the venue’s current collateral weight, valuation price and cap. If a cap limits recognized BTC, additional BTC above the cap may not improve the result; reducing the position or adding another eligible asset may be more effective.
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Common mistakes and corrections
- Adding every wallet balance to one equity figure: Keep venue and wallet boundaries; aggregate only for reporting.
- Using BTC’s full market value: Apply the documented haircut, collateral weight, cap and valuation price.
- Trusting one displayed liquidation price: Portfolio-margin systems may have no fixed price; monitor account-level ratios and staged controls.
- Applying a cross-margin rule to isolated positions: Verify which funds and positions actually share risk.
- Ignoring liabilities and accrued charges: Include loan interest, funding, fees and conversion effects at every refresh.
- Assuming a hedge prevents liquidation: The losing account can liquidate before the hedge settles or before collateral can be transferred.
- Comparing thresholds without definitions: A 105% uniMMR trigger and a 100% MMR trigger are not directly comparable unless numerator, denominator, product and action are identical.
- Leaving old parameters in the model: Record the document date and recalculate after every rule, haircut or product change.
A repeatable review checklist
- Export current balances, positions, liabilities and accrued charges for every venue.
- Label each wallet and position as isolated, cross or portfolio margin.
- Read the current official rules for eligible collateral, weights, caps, valuation prices, maintenance tiers, alerts and liquidation order.
- Calculate recognized collateral, equity, maintenance requirement, ratio and headroom independently for each account.
- Rank accounts by distance to their own intervention threshold.
- Run simultaneous BTC-price, P&L, haircut, funding, interest and liquidity stresses.
- Model transfer delays, access interruptions and the residual position after each possible hedge leg is closed.
- Record assumptions, rule versions and timestamps.
- Recheck the model whenever collateral, position size, account mode or venue parameters change.
Official exchange documentation is volatile and can vary by jurisdiction, eligibility and product. Check the applicable rules immediately before relying on a result; a spreadsheet is a monitoring aid, not a guarantee that liquidation will not occur.
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