Verticals, Iron Condor and Butterfly - defined-risk spreads

Selling a naked option is unlimited risk. A spread is the same directional and volatility play, but with a roof over your head. The vertical, the Iron Condor and the Butterfly are three forms of the same idea: you pay for a protective wing to cut the tail of the loss distribution. You give up part of the profit, you gain survival.

This lesson teaches you how to calculate risk, max profit and breakeven, and how to measure whether a spread makes sense after commissions.

Why spreads instead of naked options

Naked options have a fantastic Theta profile, but one gap can wipe out months of profits. A spread gives up 70% of the Theta but cuts the risk by 80-90%.

The rule: if you cannot fall asleep with a naked option, do not google for affirmation. Turn it into a spread.

The Vertical Spread - the building brick

A vertical is two options with the same expiry, different strikes, the same type (call or put).

Types:

• Bull Put Spread: you sell an ATM/OTM put and buy a lower OTM put. A bullish or neutral bet. Credit on entry.
• Bear Call Spread: you sell an OTM call and buy a higher OTM call. A bearish or neutral bet.
• Bull Call Spread (debit): you buy a call and sell a higher call. You pay a debit, you bet on a rise, but cheaper than a long call.
• Bear Put Spread (debit): you buy a put and sell a lower put.

Formulas for a credit spread (Bull Put / Bear Call):

Credit received = Price of the option sold - Price of the option bought
Spread width = |Strike sold - Strike bought|
Max Profit = Credit
Max Loss = Width - Credit
Breakeven = Strike sold +/- Max Profit (depending on the type)
Return on Risk = Max Profit / Max Loss

Example of a Bull Put Spread on SPY:
SPY at 450 USD, Sell the 440 Put for 2.00, Buy the 435 Put for 1.00
Credit = 1.00 * 100 = 100 USD
Width = 5 USD = 500 USD
Max Profit = 100 USD
Max Loss = 400 USD
Breakeven = 440 - 1 = 439
ROC = 100/400 = 25%

Measure the efficiency not in ROC, but in:

Expected Value ≈ P(Win) * Max Profit - P(Loss) * Max Loss
P(Win) ≈ 1 - Delta of the short leg (an approximation)
If EV < 0 after commissions, the spread makes no mathematical sense.

The Iron Condor - two verticals at once

An Iron Condor = a Bull Put Spread + a Bear Call Spread, the same expiry, both OTM. The bet: the market stays in a range.

Construction:
Sell the put spread: e.g. 440/435
Sell the call spread: e.g. 460/465
All of it on SPY at 450, 30-45 DTE

Total credit = Put spread credit + Call spread credit
Max Profit = Total credit
Max Loss = Max(Put spread width, Call spread width) - Total credit // if symmetrical, this is simpler
Lower breakeven = Strike of the put sold - Credit
Upper breakeven = Strike of the call sold + Credit

Example:
440/435 put for a credit of 1.00, 460/465 call for a credit of 1.00
Total credit = 2.00 = 200 USD
Max loss = 5 - 2 = 3.00 = 300 USD per side
Breakeven = 438 and 462

Why is the Iron Condor popular? Because of double Theta and because it looks “safe”. The truth: double Theta = double Gamma. When the market breaks out through one side you lose, and the other side does not gain proportionally past breakeven.

Measure:

• Net delta should be between -10 and +10 at entry.
• Theta / Vega: if Vega is 3x larger than the daily Theta * DTE to closing, you are a bet on IV, not on a range.

The Butterfly - a bet on precision

A Butterfly is a bet that the price will be exactly where you want it. A construction of 3 strikes, most often symmetrical.

Long Call Butterfly (debit): Buy 1x Call Strike Low, Sell 2x Call Strike Middle, Buy 1x Call Strike High

Cost = Debit paid
Wing width = Middle - Low (should = High - Middle for symmetry)
Max Profit = Width - Debit (when the price = Middle on expiry day)
Max Loss = Debit
Lower breakeven = Low + Debit
Upper breakeven = High - Debit

Example: SPY 450
Buy the 445 Call, Sell 2x the 450 Call, Buy the 455 Call
Debit = 1.50 = 150 USD
Width = 5
Max Profit = 350 USD at 450
Max Loss = 150 USD

A Butterfly has a very low cost but a very narrow profit zone. For a retail trader it is better for buying cheaply (a long butterfly) than for selling (a short butterfly has unlimited risk and is called an Iron Butterfly in the put/call version).

When to use it:

• Vertical: when you have a direction and want to cap the risk
• Iron Condor: when the IV Rank is high (>50), the market is consolidating, DTE 30-45
• Butterfly: when you expect the price to pin (for example before expiry), IV is low, and you want a small debit for a large payout

When the plan says do not trade

1. When the spread width is < 1.5x the credit. Your ROC is < 50%, but you still carry the full risk of the width. After commissions (4 legs) 10-15% max is left. Not worth it.
2. When the bid/ask of the whole spread is > 15% of the credit. On illiquid options (the WIG20 away from ATM) slippage kills the whole edge. If you cannot enter with a limit order at mid-price +/- 5 cents, walk away.
3. When DTE < 7 and you play an ATM Iron Condor. Gamma is absurd. One 1% candle takes away 200% of the max profit. The Iron Condor is a 30-45 DTE strategy, closed at 21 DTE.
4. When the IV Rank is < 20 and you sell premium. You are selling cheaply what you should be buying. In low IV, buy debit spreads (Bull Call / Bear Put) instead of selling credit spreads.
5. When you have 2 losing verticals in a row on the same ticker. That is not bad luck, it is poor strike selection or ignoring the D1/W1 trend. Stop for 48h and calculate the EV again.

Mistakes that cost the most

Measurable exercise

Title: Comparing 20 spreads - credits vs closing at 50%

1. On paper or in a journal (no trading) pick SPY and over 4 weeks record 20 different 30-45 DTE Iron Condors: strike, credit, width, Delta, IV Rank on the day you would have opened them.
2. For each one calculate: Max Profit, Max Loss, ROC, P(Win) ≈ 1 - (Put Delta + Call Delta).
3. Simulate the rule: closing at 50% of max profit or at 21 DTE. Count how many days it takes on average to reach 50%. Record the commissions (assume 1.5 USD per leg).
4. Calculate the EV after commissions for each one. Sort the table by EV, not by ROC.

Pass criterion: 20 spreads calculated, including 5 with an IV Rank < 30 and 5 with an IV Rank > 60. You will see the difference in the credit.

Check yourself

1. Bull Put Spread: Sell the 440 Put at 2.50, Buy the 435 Put at 1.20. Calculate the Max Profit, Max Loss, Breakeven and ROC.
2. How does an Iron Condor differ from two independent verticals? When does that difference matter for margin?
3. Why is closing credit spreads at 50% of max profit statistically better than holding them to expiry?
4. A Butterfly 5 USD wide, debit 1.20. What are the Max Profit, Max Loss and Breakevens?
5. When is a debit spread (Bull Call) better than a credit spread (Bull Put) despite a similar bullish thesis?

Frequently asked questions

Does a vertical always have defined risk? Yes, if both legs are options of the same type and the same expiry, the risk is limited to the width minus the credit/debit. If the expiries are different (a diagonal), the risk is different - that is no longer a classic vertical.

How many DTE for an Iron Condor? For a retail income trader the standard is 30-45 DTE at entry, closing at 21-14 DTE or at 50% of max profit. Below 14 DTE Gamma grows non-linearly. Above 60 DTE Theta is slow.

Can I take a loss larger than the max loss from the formula? Yes, if one leg is assigned early or there is a price gap and you do not have the second leg covered with cash or shares, and the broker closes your position at a worse price. That is why the whole spread must sit in an account collateralised with cash or margin for the full width.

Why does my broker show a different Max Loss than my calculation? Because it does not include commissions and any assignment fees. Always add 4-8 USD per leg * 4 legs as a worst-case cost for the USA. For the Warsaw Stock Exchange (GPW) count the commission on every leg under the OW20 table.

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Educational material. This is not investment advice or a recommendation. Every trading decision is your risk. Measure the credit, the spread and the time instead of guessing the direction.

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