So I have had a couple of very specific questions about what happens to a synthetic long at expiration. This is one of those topics that sounds simple until you actually sit down and think through both sides of the trade. And if you do not understand it, you can end up in a situation you did not plan for.
Let's pretend today I bought a December 2027 Tesla $400 synthetic long. That means I sold the $400 put and I bought the $400 call, and I paid a $25 debit. My breakeven at expiration is my strike price plus my debit. So $425.
Now let's walk through the scenarios.
Let's say Tesla is at $401 at expiration. Did you make money on this trade? Your call is in the money by $1. Your brokerage is going to automatically give you 100 shares of Tesla at $400. But did you actually make money? No. You paid $25 for that call. So you lost $24 on this trade.
What if Tesla is at $500? Now you made money. Your breakeven was $425. The intrinsic value on this option is $100 because it is $100 in the money at expiration. So you bring in $100 minus your $25 debit and you are up $75. But here is the question you really need to understand the answer to...
What Happens to Both Sides at Expiration
If you sell a $400 put and you buy a $400 call, at expiration either the call is in the money or the short put is in the money. One side is going to have an exercise or assignment situation if you do nothing prior to expiration. You need to understand how both sides work.
If Tesla is above $400 at expiration, your long call is in the money and your short put expires worthless. Nothing happens on the put side. On the call side, in most cases, your brokerage will automatically exercise it and give you 100 shares at $400. That means you need $40,000 to take that assignment. Even if the stock is way up at $700, you can probably purchase it on margin, but you still need some cash available to exercise.
If Tesla is below $400, your call expires worthless and your short put is in the money. You are going to be assigned 100 shares at $400. If you do not want that ownership, you need to buy back that short put prior to expiration.
This is why I always say, as you get into those last 30 days before expiration, if you know you do not have the money to exercise the call or the margin to handle assignment on the put, you have to start making decisions. I will keep teaching this to you in all my courses because you MUST understand it.
The Tax Difference You Need to Know
If your call is in the money and you decide to just sell it and take your profit, that is a taxable event if it is outside of a retirement account. When you take an assignment, that is not a taxable event. Those are the differences. I am not a CPA, please consult with a tax professional, but I need you to start understanding both sides of how these work.
The Real Risk: Maintenance Margin
Here is the part that catches people off guard. Let's say you sold that $400 put and Tesla falls to $250. Your short put is in the money by $150. So you are down $150 plus your $25 debit, which equals $175 loss per share, which is $17,500 PER CONTRACT because 1 contract represents 100 shares of stock.
The risk profile of a synthetic long is exactly the same as stock, plus you had an initial upfront debit. The benefit is that your upfront debit was $25 rather than buying stock outright. But you have margin risk because you sold a put to fund that call.
Let's say your maintenance margin is 30%. If you sell the $400 put, the initial margin might only be $12,000. But if Tesla drops to $300, you have lost $10,000 on the put side and you still have 30% maintenance margin based on the $300 level. So $9,000 plus that $10,000 loss. The margin keeps adjusting as the stock moves against you.
I cover this in detail in Course 301 where I walk through exactly how margin requirements shift as your position moves. If you watched MM7 where I built the NVDA MSL, or MM18 where I introduced the heir and a spare concept, you have seen me design trades specifically to manage this margin risk using a modified synthetic long structure with a floor.
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Do Not Over-Leverage
This is the most important point. It is very easy to say, well, it is only $2,500 outlay, I have enough money to do ten of these. You may have enough money to lay out ten of these for $25,000. But do you have enough money and margin and risk tolerance to have ten of these move against you $100?
You have to keep shelling out money to cover maintenance margin and risk. I need you to understand and see how these move and how these play out. This is exactly why I teach the modified synthetic long in Course 301. The MSL adds a floor, a bought put underneath your short put, which caps your downside and reduces your margin requirement. When I am wrong, I can still repair the trade. When I am right, the payoff is the same.