My Approach to Selling ASX 200 Options: Patience, Premiums and Risk

The most important decision in options trading is often the decision to do nothing.

My approach to selling options is built around patience. I am interested in opportunities where the premium appears attractive relative to the risk I am accepting, rather than trading simply because the market is open.

I describe the philosophy as thinking like an insurer. An insurer receives a premium in exchange for accepting a potential future liability. An options seller does something comparable. The premium is visible immediately; the obligation can become much more expensive later.

That distinction matters. Collecting premiums is not the same as making a profit.

Why I focus on the ASX 200

I prefer broad Australian market exposure to making the outcome depend on a single company. Individual businesses can suffer from management failures, unexpected announcements or problems that are difficult to anticipate.

An index spreads exposure across many companies. It does not eliminate the risk of a substantial market decline, nor does it remove sector concentration. Selling puts on an index still creates exposure to falling markets.

My framework considers both ASX 200 index options and exposure through STW, an ETF that tracks the index. These are different instruments, and their options must be understood separately.

XJO index options settle in cash. They do not deliver shares or ETF units when exercised. Options over shares or ETFs can involve delivery of the underlying security. A plan to accept assignment and then write covered calls therefore cannot simply be transferred from an ETF option to an XJO index option. [1]

What attracts me to selling options

When I sell an option, I receive a premium for taking on an obligation. Whether that becomes a profitable trade depends on what happens next, the price at which I close it, or its settlement outcome.

Time decay can work in a seller's favour, all else being equal. But it is not a daily cash payment, and its benefit can be overwhelmed by an adverse market move or a rise in implied volatility.

This is where the insurance analogy has limits. There is no guaranteed house advantage. A high proportion of profitable trades can still produce an overall loss if the losing trades are sufficiently large.

For me, the question is not simply, “How much premium can I collect?” It is, “What liability am I accepting, and can I withstand an unfavourable outcome?”

Why volatility gets my attention

My strategy document uses an elevated Australian market volatility reading, around 17, as a prompt to investigate opportunities. I regard that as a personal screening reference, not a universal entry rule.

Higher implied volatility generally increases option premiums, other things being equal. It also signals that the market is pricing greater uncertainty. Expensive options can become more expensive, and a falling market can continue falling.

A volatility threshold alone cannot tell me whether a trade is attractive. I also need to consider the strike, time to expiry, liquidity, existing portfolio exposure and the cash available to support the position.

Patience means being willing to pass on a trade even when the premium looks tempting.

Position sizing comes before the premium

Before considering potential income, I need to understand the scale of the exposure.

For XJO options, each index point represents AUD 10 per contract. At a hypothetical index level of 8,500, one contract represents approximately AUD 85,000 of index exposure. Two contracts represent approximately AUD 170,000. [1]

That does not mean the loss will equal the notional exposure. It does mean that two contracts supported by AUD 85,000 of capital should not be described as unleveraged or fully cash-secured.

Margin is another important distinction: the amount a broker requires to support a position is not its maximum possible loss. Requirements can increase as conditions change. [2]

If equity holdings are used as collateral, a market fall can hurt twice: the collateral can lose value while the short put position becomes more expensive to close. I therefore place considerable emphasis on available cash, overall exposure and stress scenarios.

A simple example of the trade-off

Consider a hypothetical XJO put with a strike of 8,000, sold for a premium of 100 points.

The premium received is AUD 1,000 per contract. If the applicable expiry settlement level is 7,500, the put's settlement amount is AUD 5,000: the 500-point difference multiplied by AUD 10. After the premium received, the seller's loss is AUD 4,000 before fees and other costs.

The seller's expiry break-even is 7,900 in this example, before costs. Above the strike, the maximum profit is the AUD 1,000 premium. Below break-even, losses grow as the settlement level falls.

This is an illustration of contract mechanics, not a suggested trade or a forecast. It shows why premium income must always be considered alongside the liability behind it. [1]

What happens when a trade goes against me?

I want the response to a losing position considered before the trade begins, rather than improvised under pressure.

My framework includes reviewing losses, available margin and whether the original reason for entering still holds. Closing a trade can be the appropriate decision. A planned exit is not a guarantee of a particular execution price, especially during a fast market or a price gap.

Rolling a position means closing an existing option and opening another, often at a different strike or expiry. It does not erase the first trade's loss. A new premium comes with a new obligation, and the replacement trade must justify itself on its own merits.

For options involving delivery of shares or ETF units, accepting assignment may be another possibility when adequately funded. For XJO, the obligation remains a cash settlement.

Measuring results honestly

My strategy document sets an ambitious annual return objective of 10–25%. That is a personal target, not an audited performance record, a forecast or an assurance that the approach will achieve it.

Results need to account for realised and unrealised losses, transaction costs, financing costs where relevant, and the performance of any underlying holdings. Premiums collected alone do not tell the full story. Some years may produce losses.

I place more importance on whether a process remains manageable through difficult markets than on whether it produces an attractive result in a favourable month.

The discipline of waiting

The principles I return to are straightforward: understand the obligation, size the position deliberately, preserve financial flexibility and accept that losses are part of investing.

I do not regard options selling as effortless income. It is an active commitment to managing risk, including the risk of being wrong.

For me, patience is not the absence of a strategy. It is an essential part of it.

This article describes my personal approach for general education. It is not personal financial advice or a recommendation to enter any trade. Options involve leverage and can produce losses substantially greater than premiums received. Consider your circumstances and obtain appropriately licensed advice before making investment decisions.

Further reading

1. ASX: Options contract specifications
2. ASX: Understanding Options