Cross vs Isolated Margin: Pick Your Failure Mode.
By CryptoTraders · Strategy · 2026-09-17
Cross and isolated margin are not better or worse than each other. They are two different ways to lose. Cross margin defends each position and risks the whole account. Isolated margin protects the account and gives up the position sooner. Pick the one whose failure mode matches how you actually trade.
How each works on the Unified Account
Bybit runs the Unified Trading Account, now on UTA 2.0, which pools spot, USDT and USDC perpetuals and futures, and options into one account. Inside it you choose a margin mode, and the default is cross.
Cross margin uses your entire account value, including unrealised profit, as shared collateral for every open position. Gains on one position offset losses on another, and liquidation is judged at the account level when your maintenance margin rate reaches 100%. The upside is that any single position is hard to liquidate, because the whole balance stands behind it. The downside is that one bad trade can draw down everything, because everything is collateral.
Isolated margin walls off the margin per position. The most you can lose on that position is the margin you assigned to it, and a liquidation there does not touch the rest of the account. The upside is contained, known risk. The downside is that less collateral sits behind the position, so it gets liquidated sooner.
There is a third mode, portfolio margin, which prices risk across your whole book including hedges and options for capital efficiency. It is built for traders running correlated and offsetting positions, not for someone holding a single directional perp.
One mechanic worth knowing
Since September 2025, Bybit calculates margin from the mark price rather than the entry price. Under cross margin, both initial and maintenance margin use mark price; under isolated, maintenance margin uses mark price. The Risk Limit system also still applies: as your position notional grows, your maximum leverage steps down and your required maintenance margin steps up, and those tiers now adjust in real time as price moves. Bigger size is not just more risk, it is mechanically less leverage.
How to choose
If you run one or two directional perp trades at a time and want a hard cap on each, isolated matches you. If you run a basket that genuinely offsets and you want positions to share collateral, cross fits, but only if you respect total account risk, because cross will spend the whole balance defending a loser. The common mistake is running cross while mentally treating each trade as if it were isolated. The account does not see it that way.
Where the Copy Trading Bot fits
Margin mode controls how a position can fail. Position size controls whether it should have been that big in the first place, and that is the part most traders get wrong by hand. The Copy Trading Bot sizes every mirrored signal to a fixed dollar-risk per trade on your own account rather than a fixed contract size, so the trade is the right size whether your balance is $5,000 or $50,000. It applies a global max loss limit to cap a bad day, moves the stop to breakeven after TP1, and runs on Blofin with no KYC. It will not rescue a reckless margin choice, but it removes the sizing error that usually does the real damage. Available on Elite Plus.