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Wheel strategy cost basis, worked out leg by leg

Your cost basis on a wheel position is what you paid for the shares minus every premium you collected on that position. It falls with every leg. It does not fall as fast as the stock can. Here's the arithmetic, including the turn where the basis drops and you still lose.

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

Cost basis in one line

Cost basis is the price per share you'd need the stock to reach to be flat on the whole position. On the wheel strategy, that's: (what you paid for the shares − every premium collected on this position) ÷ 100.

Each premium lowers it. Assignment sets the starting point. Being called away ends it. Simple arithmetic, with one trap at the end.

The basis after each leg (an illustration, not a trade idea)

A made-up stock, XYZ, at $50.

Closed result: ($47 sale price − $41.30 basis) × 100 = +$570. Check it the long way: $100 + $100 + $80 + $90 + $4,700 − $4,500 = $570. Same number. If the two ways don't agree, something is counted twice.

The turn where the basis falls and you still lose

Same start. XYZ at $50, sell the $45 put for $1.00, assigned at $45. Basis $44. But this time XYZ drops to $39 right after assignment.

Your basis went down every single month. The gap went up. That's the honest shape of a wheel on a falling stock: the premiums lower the basis by cents while the stock moves by dollars. Four months in you've "lowered your basis" by $1.55 and you're $845 under water.

A lower basis is not a win. It's a smaller loss than the loss without it. Both things are true, and only one of them feels good.

The mistake: counting premium twice

Here's how people fool themselves. They say: "I collected $155 in premium, so I'm up $155. And my basis is $43.45, so the stock only needs to get back to $43.45 to be flat."

Both halves are the same $155. The premium either lowers the basis or it counts as a gain. Not both. If your basis is $43.45 and the stock is $35, you're down $845, full stop. The $155 is already inside the $43.45.

The same thing happens across turns. A trader finishes turn one up $570, then starts turn two on the same stock and counts turn one's premiums toward turn two's basis. No. Turn one is closed and banked. Turn two starts at its own assignment price minus its own premiums. See how to track wheel trades for the position line that keeps this straight.

What the basis is for

• Choosing the call strike. Sell above your basis and a call-away is a gain. Below it, a call-away locks in a loss. See the strike below cost trap.
• Knowing if you're done. When shares are gone, closed result = sale price − basis, times 100.
• Not lying to yourself. The basis next to today's price, every week. If the gap is growing, your exit rule is the thing to read, not the premium column.

What it's not for: deciding whether to hold a falling stock. "My basis is only $43" is not a reason to hold a $35 stock. Your rules for the stock are the reason, or they aren't.

Tax basis is a different number

The arithmetic above is your trading basis, for decisions. Your tax basis follows your country's rules, which may treat each option as its own event rather than folding it into the shares. In Canada, registered accounts like a TFSA or RRSP change the picture again, and whether puts are even allowed there depends on the broker. Keep both numbers, and ask an accountant for the second. See taxes on selling options in the US and in Canada.

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