TRADING / PRACTICAL GUIDE
Trading Journal: Improve Your Decisions
A trading journal links the plan made before a trade to the execution and review afterward. The most useful journals capture decisions and context, not only profit and loss.
In this guide
What a complete entry captures
| Field | What goes in it |
|---|---|
| Date and time | Stamped before the order, not filled in afterward from memory |
| Setup | The specific pattern or condition you identified, named precisely enough to search for later |
| Plan | Entry trigger, invalidation level, target or exit rule, and position size, written before the order |
| Actual fill | The real entry and exit price, including any slippage from the planned price |
| Market context | What the broader market and sector were doing at the time |
| Emotional state | A short honest note — calm, rushed, tired, chasing — written at the time, not reconstructed |
| Rule adherence | Whether the trade matched the written plan, scored separately from its outcome |
| Outcome and lesson | The result, and one specific thing to repeat or change next time |
One entry, in full
Take a single example. At 9:41am, before placing anything, the plan for Northfield Robotics reads: setup is a pullback to the rising 20-day average on falling volume; entry trigger is a break back above the prior day's high; invalidation is a close below the 20-day average; size is 100 shares; target is the recent swing high, with a hard stop at invalidation.
At 9:52am, Northfield breaks above the prior day's high at $43.20. The order fills at $43.24 — four cents of slippage against the plan, noted at the time. The position closes at $44.60 when it reaches the target, an hour later. That afternoon, the entry is completed: market context was a flat broader tape, emotional state was calm and unhurried, and the trade matched the written plan exactly.
Score the decision, not just the result
A good decision can still lose, and a poor one can still win. If the Northfield trade above had stopped out at the invalidation level instead of reaching target, the rule adherence score would stay the same — the entry matched the plan, the size matched the plan, and the exit followed the stop exactly. Recording the outcome next to a separate adherence score keeps a lucky win or an unlucky loss from teaching the wrong lesson.
Use screenshots carefully
Mark the chart as it looked at the moment of the decision, before the outcome was known, and save a second image afterward for comparison. It is tempting to draw the entry line neatly once the trade has already worked — resist tidying the earlier image once you know how the trade ended.
Name screenshots consistently so a batch review can find them without guesswork: date, ticker, setup and before-or-after is enough. The naming habit sounds small, but a journal that takes ten minutes to search will gradually stop being reviewed. The record only earns its keep when you can compare similar decisions quickly.
Batch review: twenty entries later
After a defined sample — twenty entries is a reasonable first batch — group the trades by setup, time of day, market condition and mistake type rather than reading them one at a time in order.
| Group | What the batch shows |
|---|---|
| By setup | Which setup produced the most rule-consistent trades, independent of which one happened to profit most |
| By time of day | Whether adherence or results change during the first hour versus later in the session |
| By market condition | Whether the rules held up in both trending and choppy conditions, or only one |
| By mistake type | Whether the same specific error — late entry, oversized position, ignored stop — repeats across several trades |
Change one rule at a time in response to what the batch shows, and record the date of the change in the journal itself. Changing several rules at once after a review makes the next batch impossible to interpret.
Common mistakes
- Recording only the outcome: A log of profit and loss with no plan, context or adherence note cannot explain why a result happened.
- Writing the plan after the fill: A plan reconstructed after seeing the outcome is not a plan — it is a justification.
- Reviewing one trade at a time: Single-trade review misses patterns that only appear across a batch.
- Changing several rules after one review: Makes the next batch of results impossible to attribute to any single change.
What a journal cannot fix
A journal records decisions; it does not make them for you. It can show that a mistake keeps repeating, but the discipline to change the behaviour still has to come from somewhere else — often a mechanical rule or a forced pause, not just awareness of the pattern written on the page.
What to do next
- Build the eight-field entry template above and use it for your next ten trades, filled in before, during and after each one.
- Write the plan for your next trade before the order, with a timestamp, and compare the actual fill against it afterward.
- After twenty entries, run the batch review by setup, time, condition and mistake type, and change exactly one rule.
Sources and further reading
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Educational purpose: This guide provides general education. It does not provide personalised financial, investment, legal or tax advice.