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I counted the premium as profit before the trade ended. Here's what it hid.

The premium hits your account the day you sell, so it feels earned. It isn't, yet. Until the option and any shares it drags in are closed, the premium is just a smaller loss or a bigger gain waiting to be measured. Here's the mistake in numbers.

Options guide · 8-minute read · Updated 2026-10-26

The mistake in one sentence

You sold an option, the cash landed, and you wrote "+$100" in the win column. Then the stock did what stocks do, and the win column stayed green while the account went red.

Premium is paid up front. Profit is only known when the trade is over. Mixing those two up is how a seller can run a string of "wins" and still finish the year down.

Why the cash feels like profit

Your broker shows the premium in your cash balance the same day. The option line shows a negative number, but that's easy to look past. And the Theta melt makes the option's value shrink most days, so the screen keeps agreeing with you.

Then assignment happens, or the stock drops, and the green premium is sitting next to a much bigger red number on the shares. The premium didn't change. What changed is that you finally looked at the whole position.

A worked example (an illustration, not a trade idea)

A made-up stock, XYZ, trades at $50. You'd be fine owning it at $45, so you sell a 30-day $45 put for $1.00 and collect $100.

How you logged it: "Trade 1: +$100. Win."

XYZ falls to $40 by expiry. You're assigned 100 shares at $45. You sell a 30-day $45 call for $0.50, collecting $50.

How you logged it: "Trade 2: +$50. Win."

XYZ falls to $36. The call expires. You sell another $45 call for $0.20.

How you logged it: "Trade 3: +$20. Win. Three for three."

XYZ is at $35 at the next expiry. Here's the account the way the journal saw it, and the way it really is:

Three green trades. One losing position. The journal was tracking the wrong thing.

The cost-basis view fixes it

Stop logging each option as its own trade. Log the position: the shares plus every option sold against them. One line that answers a single question: what do these shares really cost me now?

Now the honest line is: "100 shares of XYZ, cost basis $43.30, trading at $35, down $830." No wins, no losses, just a position and its distance from break-even.

That's how the wheel strategy is meant to be measured. Every premium lowers the basis. The trade ends when the shares are gone, and the result is the sale price minus the basis. Our cost basis guide shows the full bookkeeping.

Why the mistake costs more than bad bookkeeping

Wrong accounting leads to wrong decisions.

• It makes you oversize. Three "wins" feel like skill, so you sell two contracts next time. The shares just doubled too.
• It hides the stock. You stop asking "do I still want this company?" because the trade log says you're winning.
• It invites the strike-below-cost trap. At $35 the $45 calls pay pennies, so a seller who wants another "win" drops to a $38 strike. If the stock recovers to $42, the shares go at $38, and the real loss is locked in. The strike-below-cost trap works that one through.
• It stops you from taking the honest exit. Sometimes selling the shares at $35 and moving on is the right call. A journal full of wins makes that feel like quitting while ahead.

What to do instead

1. One row per position, not per option. Open the row when you sell the first put. Close it when the shares are sold or called away.
2. Track cost basis, not premium. Each premium goes in as a basis reduction, not a win.
3. Mark the row to market monthly. Shares at today's price minus basis. That's your real standing, and it's allowed to be red.
4. Count a win only at the end. Sale price above basis is a win. Below is a loss, no matter how many premiums were collected along the way.
5. Review the losing rows first. Reading your journal after a losing trade is where the useful lessons sit.

A Canadian note: in a non-registered account your broker's tax slip tracks premiums and share sales as separate events anyway, so your journal is the only place the whole position is added up.

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