Cash-Secured Puts Explained

What it is

The basic idea

You sell someone the right to sell their shares to you at a set price (the strike) before a certain date. In exchange, they pay you a premium.

You set aside enough cash to actually buy those shares at the strike — that's what makes it "cash-secured." You're not using margin or leverage.

If the stock stays above the strike, you keep the premium and never buy shares. If it drops below, you buy the shares at the strike — but your real cost is reduced by the premium you already collected.

When it makes sense

Good fit when...

✓

You want to own the stock anyway

You'd be happy buying it at the strike price or lower

✓

You have idle cash sitting around

Earning premium while waiting to deploy capital

✓

You're neutral to mildly bullish

You don't expect a big drop but want some discount buffer

✗

Not ideal if you don't want the shares

If assigned, you must buy. Only sell puts on things you'd own.

Step by step

How a cash-secured put trade works

Set aside cash equal to the strike price × 100

If the strike is $480, you reserve $48,000 per contract. This cash stays in your account as collateral.

Sell one put contract at your chosen strike

Pick a strike below the current price — how far below determines your discount buffer and your premium.

Premium is credited to your account immediately

You keep it no matter what happens at expiration.

Two outcomes at expiration

Stock stays above strike: option expires worthless, you keep the premium, cash is freed up. Stock drops below strike: you're assigned 100 shares at the strike price — but your effective cost is strike minus premium.

If assigned, you can sell covered calls on those shares

This is the start of the Wheel strategy — see the Wheel page for how that works.

What can happen

Three scenarios at expiration

Example: QQQ at $480. You sell a $470 put for $2.50 premium ($250 total). You set aside $47,000.

Scenario	QQQ at Expiry	What Happens	Your Result
Stock stays above strike	$478	Put expires worthless	Keep $250 premium. Cash freed up. Repeat.
Stock drops to strike	$470	Assigned 100 shares at $470	Effective cost: $467.50. You own shares slightly below strike.
Stock drops significantly	$440	Assigned 100 shares at $470	Own shares at $470 effective ($467.50). Unrealized loss of ~$2,750.

⚠ The main risk is owning shares in a declining stock. Assignment isn't failure — but if the stock keeps dropping after assignment, the premium collected is a small buffer, not a hedge.

Calculator

Cash-Secured Put Calculator

Enter your trade details to see the key numbers before you enter.

Current Stock Price ($)

Strike Price ($)

Premium Collected ($)

Days to Expiration

Contracts (× 100 shares)

Risk checklist

Know these before you trade

📉

Only sell puts on stocks you'd genuinely buy. If you'd be uncomfortable owning the shares, you shouldn't be selling the put. The premium doesn't justify taking on a position you wouldn't otherwise want.

💵

Capital is tied up until expiration. The secured cash can't be used for other trades until the put expires or is closed. Factor this into your overall cash management.

📊

Return on capital is what matters. Compare the premium to the cash required — not just the premium in dollar terms. A $1.00 premium on a $20 strike is a very different return than $1.00 on a $480 strike.

📅

Early assignment is possible but rare. Usually only happens when a stock drops sharply or around dividend dates. American-style puts can be exercised any time before expiration.

🔄

Rolling is an option. If the stock drops toward your strike, you can buy back the put and sell a new one further out in time to extend your duration and collect more premium.

← Covered Calls Next: The Wheel →