Why do I need 100 shares to sell a covered call?

One standard equity option contract controls 100 shares. To sell one covered call you must own at least 100 shares of the underlying stock so you can deliver the shares if the option is exercised.

How much income can 100 shares generate with covered calls?

It depends on the stock's volatility and the strike you choose. A common target is 0.5% to 2% of position value per monthly cycle. On a $5,000 holding that can mean $25 to $100 in premium each month, before fees and taxes.

What happens if the stock rises above my strike price?

Your shares are usually called away at the strike price at expiry. You keep the premium plus the gain up to the strike. This is the trade-off of the strategy: income today in exchange for capping some upside.

Are covered calls really passive income?

They generate cash up front, but they are not entirely passive. You still choose strikes and expiries, monitor positions, and manage assignments or rolls. A good covered call tracker removes most of the administrative work.

Can I lose money selling covered calls?

Yes. If the stock falls by more than the premium collected, the position loses money. The call premium cushions the decline, but it does not eliminate it. Assignment also caps your upside in a strong rally.

How is OptionHarvest different from a spreadsheet?

OptionHarvest updates prices automatically, calculates rolling adjusted breakeven, tracks multi-currency positions, and shows your strike buffer and assignment risk in one dashboard. Spreadsheets require manual entry and become fragile as your portfolio grows.

The 100 Share Income Secret: How to Turn Your Portfolio into a Second Income Stream

In the modern financial world, the dream of "passive income" is often chased but rarely caught. We are told to buy and hold, to wait for decades, and to hope the market climbs. But what if your stocks could do more than just sit there? What if you could "rent" them out for immediate cash?

There is a strategy professional traders use to generate a second income without needing to find the next "moonshot" stock. It is called the covered call strategy, and today we are breaking down exactly how it works — and why OptionHarvest is the engine you need to manage it.

1. Could 100 shares really generate a second income?

Most retail investors view their portfolio as a static asset. If you own 100 shares of a company like Apple, Microsoft, or even a smaller $50 tech stock, you usually just wait for the price to go up. If it does not move, you do not make money.

The covered call strategy changes the math. By owning 100 shares, you unlock the ability to sell "contracts." In the options world, one contract represents 100 shares. By selling a call against those shares, you are essentially collecting a "rental fee" from another investor who wants the right to buy your stock at a specific price.

New to the strategy? Read our plain-English guide: What is a covered call?

2. The "rent your shares" analogy

Think of your 100 shares like a piece of real estate. You own the house (the stock). You can wait for the house to appreciate in value over 20 years, or you can find a tenant and collect monthly rent while you wait.

Selling a covered call is that rent check.

The tenant: the investor who buys the call option from you.
The rent: the premium cash that hits your account the moment you sell the contract.
The agreement: you agree to sell your shares at the strike price if the stock reaches it by expiry.

3. Breaking down the math: the $50 example

Let us look at the numbers to see how this works in the real world.

The setup

You own 100 shares of "Stock X" priced at $50 per share. Your total investment is $5,000.

The trade

You sell a call option with a strike price of $55. The market pays you a $100 premium immediately for this contract.

The result

The moment you click "Sell," that $100 is yours to keep. It does not matter what the stock does next; that cash is in your pocket today. That is a 2% return on your $5,000 investment just for "renting" your shares for a few weeks. Repeat that every month and you are looking at a meaningful second income stream.

Want to run your own numbers? Try the covered call calculator.

4. The win-win scenarios

One of the reasons the covered call strategy is so popular is that it offers two distinct paths to profit.

Scenario A: the "yield" play

If the stock stays at $50, or even moves up to $54, nothing happens to your shares. You keep all 100 shares and you keep the $100 premium. You can then turn around and "rent" them out again next month for another $100. This is how you generate consistent cash flow.

Scenario B: the "growth" play

If the stock rallies to $60, you are "assigned." This means you sell your shares at the agreed-upon price of $55. You made $500 in capital gains (selling at $55 what you bought at $50) and you still kept the $100 premium. Total profit: $600. Even though the stock went higher, you walked away with a massive win and cash in hand.

5. The problem: tracking the admin

The strategy sounds simple with one stock. But as any experienced trader knows: "The strategy is simple, but tracking all those strikes and expiries is the hard part."

As your portfolio grows to 10, 20, or 50-plus covered calls, you hit a tracking wall. When does each contract expire? What was your original cost basis? Is your strike buffer shrinking as the stock rallies? Are you actually making a profit after fees and assignments?

Most traders try to solve this with a messy spreadsheet. But spreadsheets are manual, they do not update with real-time stock prices, and they are prone to human error that can cost you thousands in missed opportunities. Read more about the risks in why spreadsheets fail covered call investors.

6. Why I built OptionHarvest

We built OptionHarvest to be the command centre for the modern income investor. We wanted to remove the admin work from the investing process so you can focus on what matters: the trade.

Automatic tracking

No more typing numbers into Excel. OptionHarvest tracks your positions, calculates your adjusted breakeven, and monitors your premiums automatically. It turns raw data into a clean, visual dashboard.

Real-time strategy visualisation

See exactly where your win-win scenarios stand. The app shows your strike buffer — the distance between the current stock price and your sold call — so you never get caught off guard by a sudden market move.

Gamified progress

We believe trading should be rewarding. That is why we included an achievement system. Whether you are logging your first trade or reaching the "Premium King" milestone, OptionHarvest tracks your growth as a professional investor.

See the full feature set on the covered call tracker page.

7. Start harvesting today

You do not need a million dollars to start generating a second income. You just need 100 shares and a system that works.

The era of manual tracking is over. Do not let a spreadsheet be the reason you miss out on your next $100 premium. It is time to see what your 100 shares can really do.

Try the free demo See pricing

Frequently asked questions

Why do I need 100 shares to sell a covered call?: One standard equity option contract controls 100 shares. To sell one covered call you must own at least 100 shares of the underlying stock so you can deliver the shares if the option is exercised.
How much income can 100 shares generate with covered calls?: It depends on the stock's volatility and the strike you choose. A common target is 0.5% to 2% of position value per monthly cycle. On a $5,000 holding that can mean $25 to $100 in premium each month, before fees and taxes.
What happens if the stock rises above my strike price?: Your shares are usually called away at the strike price at expiry. You keep the premium plus the gain up to the strike. This is the trade-off of the strategy: income today in exchange for capping some upside.
Are covered calls really passive income?: They generate cash up front, but they are not entirely passive. You still choose strikes and expiries, monitor positions, and manage assignments or rolls. A good covered call tracker removes most of the administrative work.
Can I lose money selling covered calls?: Yes. If the stock falls by more than the premium collected, the position loses money. The call premium cushions the decline, but it does not eliminate it. Assignment also caps your upside in a strong rally.
How is OptionHarvest different from a spreadsheet?: OptionHarvest updates prices automatically, calculates rolling adjusted breakeven, tracks multi-currency positions, and shows your strike buffer and assignment risk in one dashboard. Spreadsheets require manual entry and become fragile as your portfolio grows.