Bull Put Spreads: A Defined-Risk Alternative to Cash-Secured Puts

A bull put spread caps your risk on a put trade, at the cost of a smaller premium than a plain cash-secured put. Here's how that trade-off works, and who it tends to suit.

The core idea

A plain cash-secured put ties up the full strike value in cash — $5,000 to secure a $50 strike, for example — and your downside, in theory, extends all the way to zero. A bull put spread caps that downside: alongside selling your put, you also buy a second put at a lower strike, further out of the money. That second put costs a smaller premium, but it puts a floor under your losses no matter how far the stock falls. The two legs together form a "spread": sell the higher-strike put, buy the lower-strike put, both same expiration.

A worked example

XYZ trades at $52. Compare a plain cash-secured put to a bull put spread, both 30 days out:

The spread collects $35 less premium than the plain put — but instead of $5,000 in collateral and a loss that scales all the way down to zero, the most this trade can ever lose — and the most collateral it ever ties up — is $415, fully capped at entry.

Who this suits

A bull put spread suits a smaller account that can't tie up $5,000 in collateral per contract, or any trader who'd rather know the absolute worst case up front than take on the much larger, effectively uncapped-until-zero risk of a plain cash-secured put. The cost of that certainty is a smaller net premium and some added complexity at expiration. If XYZ finishes below $50 but above $45, only your short put is in the money — you can still be assigned and end up owning 100 shares at $50, just as you could with a plain CSP, while the long put simply expires worthless and offers no protection. If XYZ finishes below $45, both legs are in the money: your short put is assigned and your long put is exercised together, so you buy at $50 and sell at $45 in the same process, landing near your $415 max loss instead of leaving you holding stock. Because the outcome depends on exactly where the stock lands relative to both strikes, many traders close a spread before expiration rather than let it settle.

Trade with discipline

Defined risk doesn't mean no risk — a max loss of $415 is still a real loss if it happens. Know your strikes (both of them), your expiration, and your maximum risk before entering a spread, exactly as you would a plain cash-secured put. The same core discipline applies: this is about collecting premium in exchange for a clearly defined, capped risk — not a way to chase income without thinking through what the worst case actually costs.

Key takeaway: A bull put spread trades a smaller net premium for a hard cap on downside risk — a reasonable alternative to a plain cash-secured put for smaller accounts or anyone who wants defined risk.

Next, this course moves into what actually happens once a cash-secured put is assigned and the wheel enters its second phase.

This lesson is educational content explaining standard options mechanics, not personalized investment or trading advice. It is not a recommendation to run this or any strategy.