Cash-secured puts and the wheel

A cash-secured put is a short put with the full purchase price of the shares held in cash, so that assignment can be met without margin. The wheel is a cycle: sell puts until assigned, then sell calls on the shares until called away, then sell puts again. Both are popular, both are described as income, and both are ways of owning stock with a cap on the good outcomes.

The cash-secured put

XYZ at $50. Sell one 30-day $47 put for $0.90 ($90) and hold $4,700 in cash against it.

If XYZ is at or above $47 at expiration: keep the $90. Return on the cash: $90 ÷ $4,700 = 1.9% for the month.
If XYZ is below $47: assigned. You buy 100 shares at $47; your effective cost is $47 − $0.90 = $46.10 per share.

XYZ at expiry	Put value	P&L on put	Position after	Mark-to-market P&L
55	0.00	+$90	Cash	+$90
50	0.00	+$90	Cash	+$90
47	0.00	+$90	Cash	+$90
46.10	0.90	$0	100 shares at 47	$0 (breakeven)
43	4.00	−$310	100 shares at 47	−$310
38	9.00	−$810	100 shares at 47	−$810
0	47.00	−$4,610	100 worthless shares	−$4,610

The shape is the covered call's shape: flat top, long downside slope. The maximum profit is $90; the maximum loss is $4,610.

"I wanted to buy it anyway"

The standard justification: "I would happily own XYZ at $46.10, so I get paid to wait." That is true as far as it goes. Three qualifications:

You only get the shares when they have fallen through $47, which means something has usually happened. The stock you are assigned is the stock after bad news, not the stock you liked at $50.
If XYZ goes to $60 without ever touching $47, you made $90 while a buyer at $50 made $1,000. The put seller's regret in a rally is the same as the covered call writer's.
"Happily own at $46.10" should mean "happily own at $46.10 when it is trading at $40", because that is when it will happen.

None of this makes the trade bad. It makes it a defined thing: a short put with the cash to back it, paid a modest premium to take the downside of a stock from a level below the current price.

The wheel

Sell a cash-secured put below the stock.
If assigned, hold the shares and sell a covered call above your cost.
If called away, return to step 1.

Each step collects premium. Over a full cycle on a stock that ends roughly where it started, the wheel collects several premiums and books a small gain on the shares. Here is one cycle on XYZ starting at $50:

Month	Action	Stock at expiry	Premium	Result
1	Sell $47 put for 0.90	51.00	+$90	Expires, keep cash
2	Sell $48 put for 0.85	45.50	+$85	Assigned: own 100 at 48
3	Sell $50 call for 0.70	46.00	+$70	Expires, still own shares
4	Sell $49 call for 0.80	47.50	+$80	Expires, still own shares
5	Sell $50 call for 0.75	51.50	+$75	Called away at 50: +$200 on shares
Total			+$400	+$600 incl. stock gain

Four months of holding shares that were underwater, $600 total, or about 12% on $5,000 of capital over five months. That is the good version. Now the other version:

Month	Action	Stock at expiry	Premium	Result
1	Sell $47 put for 0.90	38.00	+$90	Assigned: own 100 at 47
2	Sell $45 call for 0.35	36.00	+$35	Expires; shares down $1,100
3	Sell $42 call for 0.30	34.00	+$30	Expires; shares down $1,300
4	Sell $40 call for 0.25	41.00	+$25	Called away at 40: −$700 on shares
Total			+$180	−$520

Three points from that second cycle. The premiums shrank as the stock fell, because the calls that could be sold near cost were far out of the money and nearly worthless. Selling a call below cost locks in a loss if it is assigned (month 4). And the whole exercise was a slow way to lose $520 on a stock that fell 18% and recovered a little.

Key idea: The wheel is a rotation between short puts and covered calls, which by parity is a rotation between two short puts. It collects steady premium in flat and mildly trending markets and does nothing to stop a real decline.

What determines the outcome

The wheel's result is almost entirely the stock's path. Premium is a small, steady overlay; the stock is a large, lumpy underlay. On a stock that goes sideways for a year, the wheel beats holding. On a stock that doubles, holding beats the wheel by a wide margin. On a stock that halves, both lose, the wheel a little less.

That makes stock selection the actual decision, and "high premium" is the wrong selection criterion: premium is high because IV is high, and IV is high because the stock moves a lot, and a stock that moves a lot is the one that halves. The wheel works best on stocks you would hold through a bad year without the options.

Sizing

The obligation on each put is the strike times 100. From Module 1, that is often a large fraction of a small account. A rule that avoids most disasters: no single cash-secured put whose strike × 100 exceeds the position size you would hold in that stock outright, and total committed cash across all short puts no more than the equity exposure your plan allows. The risk management course covers position caps and portfolio heat; they apply here with the strike as the position size.

Try it: Pick a stock you would hold for a year. Run a paper wheel from the current price through two scenarios you write yourself: one where it chops within 10% and one where it falls 25% and stays down. Track premiums, assignments and the stock P&L month by month. Compare both to simply holding.

Recap

A cash-secured put is a short put with the strike × 100 held in cash; max profit is the premium, effective purchase price is strike − premium.
You are assigned only when the stock has fallen through the strike; that is the stock you will own.
The wheel rotates short puts and covered calls; each is a short put by parity, and the stock's path decides the result.
High premium means high IV means a stock that moves a lot; select by willingness to hold, not by premium.
Size each put as if the strike × 100 were the stock position, because it is.