TC TradeCaliper

CSP Calculator

Cash-secured put returns at a glance — return on cash, annualized yield, and effective buy price.

Return
3.00%
Annualized
36.50%
Premium income
$150.00
Cash required
$5,000.00
If assigned, your effective purchase price (break-even) is $48.50.

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What a CSP is

A cash-secured put (CSP) means selling a put option while holding enough cash to buy the shares if assigned. You collect premium immediately; if the stock stays above the strike you keep it as income, and if it falls below you buy at the strike minus the premium — an effective discount to today’s price.

The math

return = premium ÷ strike, annualized = return × 365 ÷ days, and your effective buy price = strike − premium. Enter your numbers above to see the return on cash, the annualized yield, the premium income, and the collateral required.

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Frequently asked questions

What does CSP mean?

CSP stands for cash-secured put — an options strategy where you sell a put and set aside enough cash to buy the shares if you’re assigned. You collect the premium up front, and either keep it if the put expires worthless or buy the stock at an effective discount if assigned.

How do you calculate CSP return?

Divide the premium collected by the strike to get the return on your cash collateral, then annualize (× 365 ÷ days) to compare across expirations. This tool does both instantly, plus the cash required and your effective purchase price.

Is a CSP the same as a cash-secured put?

Yes — CSP is just the common abbreviation. This is the same calculator as our cash-secured put tool.

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<iframe src="https://tradecaliper.com/embed/csp-calculator" style="width:100%;min-height:640px;border:1px solid #e5e5e5;border-radius:8px" loading="lazy" title="CSP Calculator"></iframe>
<p style="font-size:13px">Calculator by <a href="https://tradecaliper.com/csp-calculator/">TradeCaliper</a></p>