Choosing a protective put is essentially about giving up some potential upside in exchange for a "floor." How you choose the expiration and strike price directly determines the cost of this insurance and the coverage it provides. There is no one-size-fits-all answer. The key is to consider your cost expectations and which part of the downside you want to protect against.
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Step 1: Understand the relationship between "premium" and "coverage"
A protective put has two core parameters: the strike price and the expiration date.
Strike Price: This is the "stop-loss line" you are willing to set. The higher the strike price, the closer it is to the current price, and the wider the coverage. But the premium, or option cost, also becomes more expensive. The lower the strike price, the cheaper the premium, but the less downside it can cover.
Expiration: This is how long your "insurance" remains valid. The longer the expiration, the more expensive the premium, but the longer the protection window. The shorter the expiration, the cheaper the premium, but if the risk event happens later than expected, the insurance may expire before you need it.
To calculate the breakeven point of a protective put strategy, use this formula: Breakeven point = spot purchase price + put option premium. The maximum loss is the strike price minus the breakeven point, multiplied by the contract unit. In other words, the higher the premium you pay, the higher the price needs to rise before you start making a profit.
Step 2: Choose your focus based on your core need
Case A: You are a long-term spot holder worried about black swans, so choose long expiration and out-of-the-money puts
If you hold spot and do not plan to sell in the short term, but want to protect against a tail risk event like the 2021 mining crackdown or the FTX collapse, you can choose put options with a longer expiration, such as 3 to 6 months, and a strike price that is slightly out of the money. The premium is relatively cheap. Although it may look "unused" in normal times, if an extreme drop happens, it can help you lock in a relatively good selling price.
Case B: You only want to avoid short-term event risk, so choose short expiration and at-the-money puts
If you only want to protect your position from short-term uncertainty around upcoming CPI data or an FOMC meeting, you can choose put options with a very short expiration, such as a few days after the event, and a strike price close to the current price, meaning at the money. The premium is higher, but the protection is also the most direct. After the event passes, your risk exposure will be effectively limited whether the market rises or falls.
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Step 3: Two practical selection principles
On expiration: If you are only worried about next week's data, do not buy a one-month option. Your protection period only needs to cover the time window you are worried about. The longer the time, the more value theta decay eats away.
On strike price: If this is your first time, or you do not have strong confidence in the direction, you can prioritize put options that are about 10% to 15% out of the money. Their protection range is not as wide as at-the-money options, but the premium is much lower. This helps you find a middle ground between spending too much on insurance and having too little coverage.
