Defined-risk premium selling for traders who want structure, not drama.

Most people hear "sell premium" and imagine time decay as a guaranteed paycheck. It isn't. Time decay is a force you can harness, but only if your position can survive normal market noise and the occasional punch in the mouth.

A credit spread is a simple piece of engineering built for exactly that problem. After 24 years of trading options, it's still the structure I reach for most when I want to sell premium without betting the account on one bad day. Here's how bull put spreads and bear call spreads work, how they pay, how they break, and how I manage them.

You sell an option to collect premium, then buy another option farther away to cap your worst case. You're accepting a tradeoff on purpose: limited upside, the credit, in exchange for limited downside, the cap. That isn't a cheat code. It's structure.

Four numbers tell you almost everything about a spread before you place it:

Most articles stop at three. The fourth keeps you honest.

A bull put spread is what I use when I'm bullish, or simply think a stock is unlikely to break below a level. You're not asking for a rally. You're asking for "not a breakdown."

Structure: sell a put closer to the money, buy a put farther out of the money, same expiration.

XYZ trades at $100. With about 35 days to expiration:

These prices are modeled, not live quotes, using a 32 percent at-the-money implied volatility with normal put skew, where farther out-of-the-money puts carry higher implied volatility. That skew is why the $90 put you buy isn't as cheap as beginners expect, and why the credit is $1.00, not the $1.50 many tutorials show.

Now the math:

Full win: XYZ finishes at or above $95, and you keep the whole $100. Worst case: XYZ finishes at or below $90, and you lose $400. In between, the result scales with the price.

Under the same model, XYZ finishes above $95 about 68 percent of the time and above your $94 breakeven about 71 percent of the time. Compare that with the 80 percent breakeven win rate. The market is pricing this as roughly a fair bet. That's not a flaw in the trade. It's what an efficient price looks like. Any edge has to come from implied volatility running above what the stock actually does, and from how you manage the position.

You take many small wins and accept that when the floor breaks, you take a defined hit four times the size of a full win. That's why distance and sizing aren't details. They are the strategy.

A bear call spread is the mirror image. I use it when I'm bearish or neutral and think a stock is unlikely to rip above a level. You don't need a crash. You need the stock to behave.

Structure: sell a call closer to the money, buy a call farther out of the money, same expiration.

Same XYZ at $100, same model, same 35 days:

Same story, different direction. Your trade is a bet that the ceiling holds.

A spread is really a set of decisions about whether you'll sleep at night.

Selling closer strikes pays more but forces more uncomfortable management. Selling farther strikes pays less but gives you breathing room. Watch what happens on XYZ as the short put moves away from the stock, keeping the spread $5 wide.

That's the honest picture. Distance is risk management, and I lean toward it, but it doesn't change the math in your favor by itself. I go deeper on this in my piece on probability-based strike selection for credit spreads.

Narrow spreads feel small-risk and tempt oversizing. Wider spreads raise per-trade risk but often behave more smoothly. The right width is the one you can size responsibly. I size so that a full max loss stays within a small, fixed share of the account, the approach I lay out in how much to risk on any one options trade.

Short-dated spreads decay quickly but get twitchy near expiration, when small moves whip the profit and loss around. I usually start in the 30 to 45 day range and avoid living in the last few days.

Higher implied volatility means richer credit, and it also means bigger potential moves. Don't treat juicy premium as a gift. Treat it like surge pricing for risk.

You don't need the perfect method. You need a repeatable one.

Many consistent sellers close at 25 to 50 percent of max profit, because it cuts tail risk and avoids expiration drama. If you get paid quickly, take the win quickly. Stop trying to win the last dime.

Pick a rule that forces action while the loss is still manageable. A common one is to exit when the spread's value reaches about twice the credit received. Be precise here, because traders use that phrase two different ways.

On the XYZ bull put, "the spread doubles" means buying it back at $2.00, a $100 loss. "A loss of two times the credit" means buying it back at $3.00, a $200 loss. Both are reasonable. Mixing them up in the moment is not.

Rolling without a reason is just denial with extra steps. My test: roll only if I'd open the new position on its own merits today. I cover rolling and adjustments in more detail in my vertical spreads setup, adjustment, and exit guide.

The goal is not to be clever. The goal is to stay solvent, calm, and consistent.

Most U.S. stock options are American style, so a short leg can be assigned any time before expiration. Short calls get assigned early most often just before an ex-dividend date, when call holders exercise to capture the dividend. Short puts can be assigned early too, usually when they're deep in the money late in the cycle.

If your short leg is assigned, the long leg still caps your risk, but you'll hold a stock position until you close it, which can tie up margin. The Options Clearing Corporation's Characteristics and Risks of Standardized Options explains the assignment process in detail.

The practical takeaway: if your short option is drifting in the money late in the cycle and you're hoping, you're already in the danger zone. Manage earlier.

When spreads blow up, it's usually one of five things:

Correlation is the one that sneaks up on people. Five bull put spreads on five tech stocks look like five risks. In a sector selloff, they act like one.

Credit spreads are honest. They punish sloppy structure and reward disciplined structure.

Before I place a spread, I want quick answers to these:

If you can't answer those, it's not a system. It's an idea.

A credit spread sells one option and buys a further out-of-the-money option in the same expiration for a net credit. The credit is the maximum profit, and the strike width minus the credit is the maximum loss.

Neither is inherently better. Bull puts benefit from the tendency of stocks to drift higher but face larger gap risk to the downside. Bear calls suit range-bound markets but suffer in sharp rallies. Choose based on your thesis and where premium is attractive.

Conservative sellers often use 0.10 to 0.20 delta for the short strike, moderate sellers 0.20 to 0.30. Lower delta means a higher chance of a full win but a smaller credit and a higher breakeven win rate.

Most systematic sellers close early, often at 25 to 50 percent of max profit. Holding to expiration chases the last dime while exposing you to sharp late price swings and assignment headaches.

Bull put spreads and bear call spreads are two of the cleanest ways to sell premium with guardrails, as long as you treat them as risk instruments, not lottery tickets.

The spread is just the wrapper. The real strategy is distance, sizing, and rules, especially the rule that keeps every challenged position from turning into a rolling project. Structure beats conviction. Process beats prediction. And defined risk is only as good as the discipline behind it.

Probabilities over predictions,

Andy Crowder

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Disclaimer: This is educational content only. Not investment advice. Options involve risk and aren't suitable for all investors. Examples are illustrative. Real results will vary. Talk to professionals before you risk real money