You remember your best trade in vivid detail: the timing, the thesis, and the rush when it played out exactly as you called it. But what about the losses? For me, those tend to blur. The thesis behind a bad trade fades quickly, replaced by a vague sense that “the market is irrational,” that “it was just bad luck,” or even a complete loss of the original reason for buying it.
This selective memory isn’t a sign that you’re getting old; it’s human nature. And it may be quietly costing you money.
But what if simply writing things down could make you a better investor? Are you willing to try it?
What is a trading journal
A trading journal is a structured record of every trade you make and why you made it. Think of it less as a logbook and more as a feedback loop for your decision-making. By documenting the reasons for entering and exiting a trade, you can later review whether each decision is moving you closer to or further from your goals.
Most investors track their profit and loss, but tracking your “thinking” is equally, if not more, important. It captures the reasoning, emotions, and context behind each decision, allowing you to evaluate the quality of your process, not just the outcome.
Even when an investment turns out poorly, having your original “thinking” recorded helps you identify gaps or flaws in your decision-making. That way, you can avoid falling into the same trap again, making the experience valuable even if the trade was not.
Why it’s important
Our brains are not built for honest self-assessment in markets. We selectively recall memories, a phenomenon similar to survivorship bias in our own thinking, where we remember wins as evidence of skill and dismiss losses as anomalies.
Then there is hindsight bias. Once we know how a trade ended, we unconsciously rewrite the story of why we entered it in the first place. We convince ourselves we “knew it all along,” but in reality, we would not have been that certain at the time. And if we truly knew, why did we not act more decisively?
A journal removes this ability to revise history. It creates an honest, uneditable record of what you actually thought at the moment you pressed the buy button. More importantly, the act of writing forces you to articulate a clear thesis before you act, which by itself filters out a surprising number of impulsive trades.
Key things to track
Don’t overcomplicate things, and you do not need a complicated system. At a minimum, each journal entry should capture these elements:
- Trade details: Date, ticker, entry and exit price.
- Thesis: Why are you entering or exiting? What needs to be true for this to work?
- Emotional state: Were you calm and deliberate, or just acting out of fear, FOMO, or a desire to recover a loss?
These are just some of the basic elements. Please feel free to add more to match your personal liking.
How to set up your journal
A journal is simply a recording tool, so any format works, as long as you use it consistently. You may prefer a physical notebook if you benefit from the reflective pace of handwriting, since it forces you to slow down and think. A spreadsheet in Excel or Google Sheets, which I personally use, is flexible, sortable, and easy to customise with your own columns.
Some people use Notion or similar note-taking apps, which come with free templates that are ready to use and can be edited to suit your preferences. While researching this article, I also came across several dedicated trading journal apps that sync with brokers and offer built-in analytics and dashboards. However, these are usually not free and can be overwhelming when you are just starting out.
Start with whatever feels frictionless. Try a few tools and see which one feels most natural. You can always move to a more sophisticated setup once the habit is established and you need more features.
What you stand to gain
A trading journal gives you a clear lens to evaluate your behaviour, decisions, and patterns over time. Instead of relying on memory or intuition, you build a body of evidence that helps you improve with each trade.
- Spot repeating mistakes. Without a written record, it is easy to make the same error multiple times and only have a vague sense that something is wrong. A journal makes these patterns undeniable because you can see them clearly. That clarity is the first step toward fixing the problem.
- Build discipline and accountability. Knowing that your future self will read what you wrote changes how you behave in the moment. You are less likely to take an impulsive trade if you know you will have to explain it afterwards. It creates a sense of accountability.
- Refine your strategy with real evidence. Over time, you can review which setups consistently delivered results and which only felt promising at the moment. Your journal becomes a personal playbook, a curated record of what actually works for you.
The fifth perspective
Investing is an ongoing process of learning and improvement, and a trading journal is one of the simplest tools to help you pay attention to your own decisions, study what worked, and honestly confront what did not.
You do not need the perfect template or the right app. You just need one trade, one entry, and a few honest lines about why you made it. Start with your next trade and let the learning compound from there.
