Position Sizing Basics for Options Sellers

How much of your account goes into one trade is a separate question from which strike to pick — and it comes first.

What position sizing means for options sellers

Position sizing is deciding how much of an account to commit to a single trade. For an options seller, that means looking at how much cash or margin one cash-secured put (a put you sell while setting aside enough cash to buy the stock if assigned) or covered call ties up, relative to the whole account.

A worked example

An account holds $50,000. A trader is considering a cash-secured put on XYZ, $60 strike, requiring $6,000 in collateral per contract.

Selling 4 contracts ties up nearly half the account in one stock — a very different risk profile than 1 contract, even though the strike, expiration, and mechanics of each contract are identical.

Why sizing matters independently of strike selection

You can pick a perfectly reasonable strike — one you'd genuinely be glad to be assigned at — and still take on outsized risk just by selling too many contracts. Strike selection determines whether one contract is a good trade; sizing determines how much that trade can hurt if it goes wrong. This is the core discipline behind selling cash-secured puts: only sell puts on stock you'd genuinely want to own, know your strike, expiration, and max risk before you enter, and settle sizing before you ever get excited about a premium — not after.

A common starting reference point

Many risk-conscious traders cap any single position at a modest share of total account value — often a few percent up to around 10%, though the right number depends on account size, how many other positions are open, and personal risk tolerance. There's no universal number; the point of any cap is to keep one trade from being able to meaningfully damage the whole account.

Sizing compounds across positions

Sizing isn't just about one trade in isolation. An account running five separate cash-secured puts, each a reasonable-looking 10% on its own, has committed half its capital to options collateral at once. The next lesson covers how to size for the worst case on a single trade; the module after that covers how sizing adds up across a whole portfolio.

Key takeaway: position sizing doesn't make a strike less risky — it controls how much a single bad outcome can cost relative to everything else you hold.

For more on adjusting how much you allocate to cash-secured puts as market conditions shift, the wheel-strategy course has a companion lesson on using the VIX (a market volatility gauge) as one practical framework — worth a look for more detail than this lesson goes into.

Next: how to calculate the actual worst-case dollar loss on a trade before you ever place it.

This lesson is educational content explaining standard options mechanics, not personalized investment or trading advice.