Choose the loss first and calculate the position second. Starting from leverage reverses the logic: leverage tells you how much margin is posted, not how much the trade can lose. A complete pre-trade workflow links account equity, invalidation price, execution cost, liquidation buffer and portfolio exposure.
Step 1: define the account risk budget
Let equity be 10,000 USDT and maximum planned loss be 0.5%. The trade risk budget is R = 10,000 × 0.005 = 50 USDT. This is a ceiling for stop loss, fees and expected slippage—not a target. Reduce it when positions are correlated or exchange conditions are degraded.
Step 2: place invalidation before calculating size
Suppose a long enters near 100 and the thesis is invalid below 98. Raw stop distance is 2%. If the estimated round-trip fee and adverse slippage budget is 0.20%, use a 2.20% effective loss distance.
Position notional = risk budget ÷ effective stop distance.
50 ÷ 0.022 = 2,272.73 USDT notional. Without the cost allowance, size would be 2,500 and the realized loss
would exceed the stated risk before any gap.
Step 3: choose leverage only to allocate margin
At 5× leverage, initial margin on 2,272.73 USDT notional is roughly 454.55 USDT. At 10× it is roughly 227.27 USDT. The PnL for a 2% move is the same because notional is unchanged. Higher leverage merely moves liquidation closer and leaves more free collateral available to misuse.
Step 4: keep liquidation outside the trading plan
Exact liquidation depends on maintenance-margin tiers, fees, mark price, margin mode and other positions. Use the exchange’s current estimate, then demand a meaningful buffer between the stop trigger and liquidation. If ordinary slippage can cross that buffer, the position is too leveraged or the stop is too late.
| Mode | Benefit | Failure mode | Default question |
|---|---|---|---|
| Isolated | Caps margin assigned to one position | Liquidates sooner if underfunded | Can this trade remain independent? |
| Cross | Shares account collateral | One position can consume the portfolio | Is shared collateral explicitly budgeted? |
Step 5: budget funding over the holding horizon
Funding payment is approximately position notional × funding rate per interval, with sign determined by the venue. For 2,272.73 USDT at +0.01%, a paying position owes about 0.227 USDT per interval. Small once, material across many intervals or during crowded markets. Test a base, stressed and sign-flip scenario; future rates are not known at entry.
Step 6: cap portfolio—not just trade—risk
Five altcoin longs each risking 0.5% are not necessarily 2.5% diversified risk. During a Bitcoin shock they can behave like one position. Track gross and net notional, risk by side, common benchmark beta, concentration by asset and total loss if all stops fill with stressed slippage.
Step 7: verify protection after the order
- Reconcile actual filled quantity and average price.
- Recalculate stop quantity from the live position, not requested size.
- Confirm the protective order exists on the exchange and is reduce-only or close-position as intended.
- Verify its trigger source—mark, index or last price—and record the order ID.
- If protection visibility is unknown, stop adding exposure and restore it.
Equity, risk %, entry reference, invalidation, cost allowance, notional, contracts, margin mode, leverage, exchange liquidation estimate, funding scenarios, correlated exposure and protection type. If any field is unknown, the trade is not ready.
Risk reference
The U.S. CFTC’s virtual-currency trading advisory emphasizes that margin amplifies the volatility of the underlying asset. The arithmetic is universal even though product rules and legal protections depend on venue and jurisdiction.