Coin-margined options are confusing because settlement is in Bitcoin, not USD. You pay the premium in BTC, and if exercised, you receive BTC. At settlement, the BTC price movement changes the dollar value of your payout, making the BTC-denominated P&L completely different from the USD P&L.
To get this right, you must separate two ideas: profit and loss measured in the coin (BTC), and profit and loss measured in dollars. Most people only look at the dollar amount, but the exchange settles only in BTC.
Let's look at the BTC settlement formula. Deribit's inverse options (coin-margined) are quoted in the underlying currency (BTC), premiums are paid in BTC, and intrinsic value is settled in BTC. Here's an official Deribit example:
You buy a BTC call option with a strike price of $100,000 for a premium of 0.05 BTC. At expiry, the BTC index price is $125,000.
The intrinsic value is $25,000 (125,000 - 100,000). For coin-margined settlement, the payout formula is: (strike difference / expiry index price) × number of contracts.
Plug in the numbers: (125,000 - 100,000) / 125,000 = 0.2 BTC. At expiry, you receive 0.2 BTC. After subtracting the 0.05 BTC premium you paid, your net profit is 0.15 BTC.
So far, the Bitcoin-denominated P&L is clear: you made 0.15 BTC.
Step 1: Separate Two Layers of P&L
Clarify whether you are calculating BTC-denominated P&L or USD-denominated P&L. BTC P&L looks at how much BTC your account gained or lost. USD P&L looks at the net dollar value of that BTC at the prevailing market price. First, figure out the BTC P&L, then separately assess the dollar conversion.
Step 2: Calculate the Dollar Perspective at Settlement
Convert the 0.15 BTC profit using the $125,000 settlement price: 0.15 × 125,000 = $18,750. That's your nominal dollar profit at the moment of settlement. You now have a dollar profit figure.
But here's the tricky part: if the BTC price drops to $100,000 before settlement, that 0.15 BTC becomes worth $15,000. The BTC profit hasn't changed (still 0.15 BTC), but its dollar value has shrunk by 20%.
Common Mistake
Many traders calculate expected dollar profits when opening a position, but when settlement comes, they convert the BTC received and the numbers don't match. Because the premium you paid is also in BTC — you paid 0.05 BTC, and at the time BTC was $100,000, that 0.05 BTC was worth $5,000. At settlement, you gained 0.15 BTC. At $125,000, that's $18,750, netting $13,750. But if BTC falls back to $100,000 at settlement, your 0.15 BTC is only worth $15,000, subtract the $5,000 cost, net profit $10,000 — $3,750 less than expected, while the BTC-denominated profit shows no change. This gap is what makes coin-margined P&L tricky: you're betting on Bitcoin's direction, but the settlement Bitcoin value itself is part of the bet.
Risk Note: Starting August 1, 2026, Deribit will change the delivery process for inverse options: first physically deliver into a perpetual contract, then cash settle. The official statement confirms that the P&L of the option position and the final amount received will be exactly the same as before the new process. So you don't need to worry about the change; the core takeaway remains: total P&L is identical. Only your trade log will have an extra record, and some users may even save on delivery fees.
Step 3: Cross-Check with Both USD and BTC P&L Views
Before opening a position, calculate both P&L views. Assume BTC is at $100,000, you buy a 0.05 BTC premium (cost $5,000), target settlement price $120,000. BTC profit = (120,000 - 100,000)/120,000 = 0.1667 BTC. At $120,000, that BTC is worth $20,000, minus $5,000 cost, net USD profit $15,000. Then stress test: if settlement price only reaches $105,000, BTC profit = 0.0476 BTC (worth $5,000), minus the $5,000 premium cost (which was worth that at entry, less now), net profit almost zero. You've found a floor — you not only need to be right about direction, but also that the settlement price is high enough.
Next Steps
Before trading on Deribit or OKX, use the platform's P&L calculator to simulate at least 3 settlement price scenarios. Pay special attention to when the settlement price is below your opening strike but your direction was right — see what your BTC profit and USD profit look like. After opening a position, monitor both 'Unrealized P&L' and 'USD Net Value' on your account page. If they diverge significantly, it means your position is now a mix of Bitcoin price fluctuations and directional bet. 30 minutes after settlement, check the trade log: if the new delivery process applies, you'll see a 'physical delivery to futures' record and a 'futures cash settlement' record. The two together equal your final P&L.
