How to Place Your First Trade on Interactive Brokers: A step-by-step walkthrough for Caribbean investors
You have opened the account. You have worked through the funding process.
Now comes the next question:
“How do I actually buy an investment?”
That is the focus of this 3rd walkthrough in my Interactive Brokers series for Caribbean investors.
In the first video, we went through opening the account. In the second, we covered funding it. This time, I walk through finding an investment, understanding the order screen, entering a purchase order, and checking whether it actually went through.
The aim is not simply to show you where the Buy button is. It is to help you understand the instructions you are giving the broker, and the checks to make before and after submitting an order.
New to the series? Start with my account-opening and account-funding guides first.
Watch the step-by-step walkthrough
This is an educational demonstration using a simulated paper-trading account. SPY is used as an example, not as a recommendation to buy that investment. This article is not personalised investment or tax advice. Always check the current instructions, permissions, fees and disclosures applicable to your own account.
Paper trading is a simulation: its executions should not be treated as a guarantee of how an order would behave in a live account.
SPY is one ETF exposure to the S&P 500 index- there exist other ETFs and methods of exposure.
Video timeline
Use these timestamps to find the section most relevant to you.
Note: Adjust speed if desired.
Time | Section |
00:00 | Introduction, series recap and educational disclaimer |
00:43 | Logging in and checking the funds in your account |
01:54 | Why you should decide what the money is for before investing |
02:14 | Opening the order ticket and searching for SPY |
03:22 | Checking the correct investment, listing and currency |
03:53 | Understanding the last-traded price, bid and ask |
05:07 | Checking whether market data is live or delayed |
05:42 | Selecting Buy and entering the number of shares |
06:16 | Market orders versus limit orders |
07:41 | Time in force: Day versus Good-Til-Cancelled |
08:50 | The outside-regular-trading-hours setting |
09:18 | All-or-none orders and partial fills |
10:06 | Previewing the order, estimated fees, and account impact |
11:46 | Submitting the purchase order |
12:19 | Checking Orders & Trades to see whether it filled |
13:05 | Modifying the unfilled limit order and confirming execution |
13:43 | Finding the investment in your portfolio |
14:09 | Selling shares or closing a position |
15:53 | Recap: the checks to make before and after trading |
18:00 | From placing a trade to building a portfolio |
Additional written guidance: Below the walkthrough, I also explain how to buy by dollar amount rather than number of shares. That feature is not demonstrated in the video.
Want content like this straight to your inbox? Join our mailing list below.
1. Start by checking your funds—not by searching for a stock
Before entering an order, check that the funds you intend to use are available in the account and confirm their currency.
In this demonstration, I use U.S. dollar funds to make the purchase without borrowing. That keeps the example focused on buying an investment with money already available, rather than using leverage.
There is also a more important question to answer before opening the order ticket
What is this money for?
Having cash in a brokerage account does not mean you need to invest all of it immediately.
Think about the purpose of the money, when you might need it, and how the proposed investment fits that purpose. The platform helps you execute a decision; it does not make the decision appropriate for your circumstances.
2. Find the correct investment
In the walkthrough, I navigate to Trade → Order Ticket and search for SPY, the S&P 500 ETF used in the demonstration.
The search results are not something to click through casually. I pause to check the investment, its listing, and the currency before proceeding. Your First trade
My approach is to confirm three things:
The name and ticker: Is this the investment I intended to buy?
The instrument and listing: Am I selecting the correct product and exchange listing?
The trading currency: Is this the currency in which I intended to transact?
A familiar ticker or name should be the start of the check, not the end of it.
A useful currency clarification: The currency used to buy an ETF does not, by itself, tell you all the currency risks within that investment. Its underlying holdings matter too. Buying a USD-traded listing is therefore not the same as establishing that every underlying exposure is to the U.S. dollar.
3. Understand the price screen
Before placing the order, take a moment to understand the prices you are looking at.
The last-traded price tells you where the most recently reported transaction occurred. It is not a promise that your next order will receive that same price.
The bid is the highest quoted price a buyer is offering, while the ask is the lowest quoted price a seller is asking. The difference between them is the bid–ask spread.
The large number displayed on a quote screen is not necessarily the price at which you can immediately buy or sell.
Check whether the quote is live or delayed
In the video, I also point out the market-data information rather than assuming every displayed quote is live.
IBKR’s available data depends on the account’s subscriptions and configuration. Delayed data may be provided when you don't have a real-time subscription, so check the indication on your screen.
Know what price you are looking at before using it to set an order.
4. Select Buy and enter the intended quantity
For the example, I select Buy and enter two shares. That is a demonstration quantity, not a suggested investment amount.
This is a small step, but it deserves attention.
Confirm that the action is Buy, not Sell, and that the quantity is the one you intended. Do not simply accept a prefilled quantity. In the recording’s recap, I specifically flag that an order ticket may already contain a number such as 100 shares, which could be very different from what you planned to purchase.
Later in this article, I explain the alternative: entering a dollar amount instead of a share quantity.
5. Choose between a market order and a limit order
There are many order types, but this walkthrough focuses on two.
Market order: prioritising execution
A market order instructs the broker to buy or sell at available market prices without setting a maximum purchase price or minimum sale price.
That means the execution price can differ from the last price you saw. A market order is not an instruction to transact at a particular displayed quote.
Limit order: setting a price boundary
A buy limit order specifies the maximum price per share you are prepared to pay. It can execute at that price or lower, but it may not execute at all.
For a hypothetical example, suppose you enter a buy limit of US$100. If the available selling price remains above that level, your order may remain unfilled.
That does not necessarily mean anything is wrong with the platform. Your price condition has simply not been met.
In the video, I use a limit order to make that price decision explicit.
Investors should note that a limit order controls the execution-price boundary; it does not guarantee a fill or protect the investment against falling in value after purchase.
6. Check how long the order should remain active
The time-in-force setting determines how long an order remains active.
A Day order generally expires at the end of the applicable trading session if it has not filled.
A Good-Til-Cancelled, or GTC, order can remain active beyond that session until it fills, is cancelled, or reaches an applicable broker expiration condition.
For this demonstration, I use a Day order and leave Outside Regular Trading Hours set to No.
A timing note for Caribbean investors
The normal core U.S. equity trading session is 9:30 a.m. to 4:00 p.m. Eastern Time, subject to exchange holidays and shortened sessions. Those are Eastern Time hours, so check the corresponding local time rather than assuming the same clock times apply where you live.
What does “all or none” mean?
The video also explains the all-or-none condition.
Where supported, this tells the broker that the entire requested quantity must be filled rather than accepting a partial fill. Without that condition, an order can be partially executed- for example, one share purchased while another remains outstanding.
The point is not to switch on every available setting; rather, it is to understand what each instruction does before using it.
7. Preview the order before submitting
This is one of the habits I would encourage you to build from your very first trade:
Preview first. Submit second.
In the walkthrough, I review the investment, Buy/Sell action, quantity, order type, limit price, time in force, and estimated fees before proceeding. The preview also shows a projected account impact.
Take this opportunity to ask:
“Does the order on this screen match the decision I intended to make?”
Check the total financial commitment, not just the price of one share. Also remember that an estimated commission is an estimate, and your costs will depend on the applicable pricing arrangement and transaction. Do not assume the fee shown in a demonstration applies to every investment or every account.
There is no benefit in rushing through the final screen simply because you have already filled in the earlier fields.
8. Submit the order—and then check its status
Submitting an order is not the same as completing a purchase.
The video demonstrates this directly. After submitting the initial purchase order, I go to Trade → Orders & Trades to check what actually happened. The order has been submitted, but it has not filled.
IBKR’s Orders & Trades area lets you review pending orders and executed transactions, including details such as quantity, status and execution price.
Do not stop at the submission confirmation. Check whether the order is still working, has been partially filled, or has been completed.
What happens when the limit order does not fill?
In the recording, the market has moved above the limit price I entered. I show how to modify the outstanding order, submit the change, and then confirm that the simulated purchase has filled.
That is an illustration of how the platform works and not a rule that you should keep increasing your price until an order executes.
The better question is:
“Am I still comfortable buying at the revised price?”
A price limit should reflect a decision, not become something you repeatedly move just to get a transaction completed.
9. Find the holding and understand how selling works
After confirming the purchase, I return to Portfolio to locate the holding.
I then demonstrate how to open a sell order, including using the Close option to populate the holding’s quantity and adjusting the quantity for a smaller sale. The selling portion is a walkthrough of the order and preview; I do not complete the sale in the recording.
The meaning of a limit price changes with the direction of the trade:
When buying, it is the maximum price you will pay. When selling, it is the minimum price you will accept.
The same discipline applies on the way out: review the action, quantity, price conditions, and estimated costs before submitting.
Showing how to sell is not a suggestion to buy something and immediately sell it again. It is about understanding both sides of the process.
An additional feature: buying by dollar amount instead of number of shares
This section supplements the video.
In the recording, I enter the order in shares. But there is another useful way to size a purchase:
Instead of saying, “Buy two shares,” you can say, “Buy US$100 worth.”
IBKR’s Client Portal supports entering an order quantity in shares or dollars when fractional-share trading is enabled. Availability depends on the account and the investment’s eligibility.
How dollar-based buying works
With a cash-quantity order, you specify the amount you want to invest. The execution price determines the corresponding number of shares, which may include a fraction of a share.
For a simple hypothetical example, US$100 invested at an execution price of US$200 per share would represent 0.5 shares, before considering transaction charges.
This can be useful when you have decided on an investment amount rather than a whole-share quantity.
How to use it in the order ticket
First, check fractional-share permissions. In Client Portal, go to Settings → Trading → Trading Permissions, open the Stocks permissions, and look for Global (Trade in Fractions).
Follow the prompts and disclosures applicable to your account.
Next, change the quantity unit. In the purchase order ticket, use the quantity selector to switch from Shares to the cash or currency option, such as USD, where available. Then enter the amount you intend to invest. Check the unit carefully: 100 shares and US$100 are very different instructions.
Then complete and preview the order. Select the supported order type, price condition, and time in force. Review the estimated share quantity, investment value, and charges before submitting. IBKR supports market and limit orders for eligible fractional-share transactions.
One important point:
The dollar amount sizes the investment. The limit price sets the maximum price per share for a buy order.
Those are separate fields with separate jobs.
Also, do not assume that entering a cash amount removes transaction costs. Review the estimated charges and ensure the account has sufficient available funds. Fractional trading remains subject to the applicable commission schedule.
Buying by dollar amount changes how you specify the size of the purchase. It does not decide whether the investment belongs in your portfolio.
The checks to make every time
The process can be reduced to one repeatable sequence:
Correct investment → correct listing and currency → correct action and quantity → appropriate order settings → previewed cost → confirmed execution.
That is the discipline I return to at the end of the walkthrough. Do not let a familiar screen or a previous successful trade replace those checks.
Your first trade is a step—not the whole plan
Opening the account gives you access.
Funding it gives you the ability to invest.
Placing the first trade shows you how to use that access.
But knowing how to buy an investment is different from deciding whether it belongs in your portfolio.
Before your next purchase, ask yourself what the money is for, when you might need it, and how the investment fits alongside everything else you own.
That includes the rest of your investment portfolio, but also your wider financial position and real assets. The question is not just whether you can buy something. It is how that purchase fits into what you are trying to build.
Need help deciding what belongs in your portfolio?
If your account is open and funded, but you are unsure how to structure the investments inside it, you can book an Introductory Strategy Call with me.
We will discuss what you are trying to accomplish and whether a financial planning or portfolio strategy session would be the right fit for your situation.
If you already have a clear plan, I hope this walkthrough makes the practical process easier to follow. And if someone you know has opened an account but feels unsure about making that first purchase, feel free to share this guide with them.
As always, no pressure, just perspective.
- Daniel Tittil, CFA, CAIA, MSc.
Lead Advisor, WealthwithDaniel.com
Portfolio & Wealth Manager, Director, Admiral CapitalChief Investment Officer, Legacy Wealth Management (Cayman) Ltd.
Want content like this straight to your inbox? Join our mailing list below.
Comments