What does buying a put alongside stock actually cost you?
The protective put is the covered call's opposite number: instead of selling your upside for a payment, you pay for a floor under your downside. It is the closest thing markets offer to insurance on a share position — and like all insurance, the interesting question is not whether it works but what the premium does to you over time.
Again: mechanics, not a recommendation.
The setup
You own 100 shares bought at $100 ($10,000). You buy one three-month $90 put for $2.00 ($200). Whatever happens, you can sell those shares at $90.
The three outcomes, in numbers
Stock at $60 at expiry. The shares lost $40 each, but the put lets you sell at $90. Position value = $9,000. Cost = $10,000 + $200. Net = −$1,200 (−12%). Without the put, the same move costs −$4,000 (−40%).
Stock at $105 at expiry. The put expires worthless. Shares gained $500, less the $200 premium = +$300.
Breakeven rises from $100 to $102 — the stock must gain 2% in three months just to leave you level.
The floor has a deductible
Maximum loss = (purchase price − strike) + premium = $10 + $2 = $12 per share = 12%.
This is the detail most descriptions skip. A protective put does not eliminate loss; it caps it, at a level you chose when you picked the strike, plus what you paid for the privilege. Choose a $95 strike instead and the deductible shrinks — and the premium rises. There is no free floor anywhere on the chain.
What it costs to keep
1. It repeats. $2 per quarter is about $8 per year, roughly 8% of the position annually. Held continuously through ordinary markets, that drag can comfortably exceed the losses it prevents. Permanent hedging is not a neutral act; it is a persistent fee on your returns.
2. It is dearest exactly when you want it. Puts become expensive when markets are frightened — that is implied volatility from Unit 2 and vega from Unit 3, in practice. Buying protection after a decline can cost several times what the same protection cost the month before. The instinct to hedge arrives precisely when the price of hedging has already moved.
3. Every quiet quarter is a quarter you lagged. Each expiry in which the put pays nothing is a period in which simply holding the shares beat holding the shares plus the put, by exactly the premium.
The shape, and a piece of real theory
Draw it: below $90 the line is flat — floored. Above $90 it is the stock's own line, shifted down by the $2 premium. Flat, then hinge, then rising.
That is the same shape as owning a call. Long stock plus a long put is a synthetic long call, a consequence of put-call parity and a genuinely useful thing to know — it tells you that "stock plus protection" and "a call option" are describing one payoff in two vocabularies, and you can compare their costs directly. That is a mechanics fact, and we are stopping there.
Try it now
- Pick a put roughly 10% below the current price, expiring in about three months, from Apple's chain in the EODHD Terminal. Note the premium as the midpoint of Bid and Ask, and today's share price, below.
Open AAPL.US — options in the EODHD Terminal
- Compute the maximum loss including the premium, as a percentage of the position, and then the annualised cost: 4 × premium ÷ share price. Say both out loud.
- Estimate what the same protection cost in a past high-volatility stretch. Old option prices are marketplace data and are not reproduced here, but their main input is: the VIX, charted first below, is the implied volatility of the S&P 500. Measure its level in a frightened stretch you pick against its level today. An at-the-money premium moves roughly in proportion to implied volatility and a put 10% out of the money moves by more, so today's premium scaled by that ratio is a floor for what the put cost then. Apple's own chart below shows what the stock was doing across the same stretch. Compare that premium with today's — the difference is the lesson.
A note on what we do here. Mechanics illustration only, downsides included. A protective put costs money whether or not it is needed, raises your breakeven, and caps but does not remove your loss. Nothing here is a recommendation.